Gaj Quiz For Aptech

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| By Vietha

Vietha

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Quizzes Created: 11 | Total Attempts: 9,898

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1/58 Questions

Annotations are comments, notes, explainations, or external remarks attached to a web document.
- True
- False

About This Quiz

If you like answering specifically designed questions about GAJ quiz for Aptech try out this quiz. It is quite simple and straightforward therefore it will be easy to answer.

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2.

Invoke methods using refleftion.
- GetField() on class
- NewInstance() on Constructor
- Invoke()
- Set()
- NewInstance() on class
Correct Answer

A. Invoke()

Explanation

The correct answer is "invoke()". The invoke() method is used in reflection to dynamically invoke methods on an object. It allows us to call a method by providing the method name as a string and passing the required arguments. This method is commonly used when the method name or the number of arguments is not known at compile time. Therefore, invoke() is the appropriate choice for invoking methods using reflection.

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3.

Returns the start index of the previous match.
- Int start()
- Int end()
Correct Answer

A. Int start()

Explanation

The method "int start()" is likely a part of a larger program or function that is used to find matches or occurrences of something. The purpose of this method is to return the start index of the previous match that was found. It allows the program to keep track of where the matching pattern or element was found in the string or data being searched. By returning the start index, the program can then perform further operations or calculations based on the location of the match.

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4.

Occurs when Interrupt() or ThreadSleep() are called.
- IllegalThreadState
- InterruptedException
Correct Answer

A. InterruptedException

Explanation

InterruptedException is the correct answer because it is thrown when a thread is waiting, sleeping, or occupied with some other task, and it is interrupted by calling the interrupt() method or when the thread's sleep is interrupted by calling the Thread.sleep() method. This exception is used to handle situations where a thread is waiting or sleeping and needs to be forcefully interrupted.

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5.

If the Thread is alive, the boolean value True is return. instead of that, return False value.
- True
- False
Correct Answer

A. True

Explanation

The explanation for the given correct answer is that if the thread is alive, it means that the thread is currently running and has not terminated yet. In this case, the boolean value True is returned. However, if the thread is not alive, it means that the thread has either not started or has already terminated. In this case, the boolean value False is returned.

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6.

The expression [a-z&&[^abc]]
- Matches everything from a->z, except a,b,c.
- Matches 'a','b' and 'c' that is common.
Correct Answer

A. Matches everything from a->z, except a,b,c.

Explanation

The given regular expression [a-z&&[^abc]] matches any lowercase letter from a to z, excluding the letters a, b, and c. It does not match the letters a, b, or c, but matches any other lowercase letter in the English alphabet.

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7.

In a multitasking environment two or more processes run concurrently
- True
- False
Correct Answer

A. True

Explanation

In a multitasking environment, two or more processes are able to run concurrently, meaning that they can execute simultaneously. This allows for efficient utilization of system resources and improves overall system performance.

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8.

Be Known as single - element, It consists of single value. It can be represented as data= value pair or value within the parenthese.
- Full Annotations.
- Maker Annotations.
- Single - Value Annotations.
Correct Answer

A. Single - Value Annotations.

Explanation

The given correct answer is "Single - Value Annotations". Single - Value Annotations are annotations that consist of a single value. They can be represented as a data= value pair or a value within parentheses. Unlike Full Annotations and Maker Annotations, Single - Value Annotations do not have additional information or multiple values associated with them.

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9.

Represents A digit: [0-9]
- \d
- \D
- \A
Correct Answer

A. \d

Explanation

The correct answer \d represents a digit from 0 to 9. It is a shorthand character class in regular expressions that matches any single digit.

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10.

Returns the start index of the last match plus one.
- Int end()
- Int start()
Correct Answer

A. Int end()

Explanation

The end() function returns the start index of the last match plus one. This means that it gives the index immediately after the last character of the matched substring.

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11.

Join() method Throws InterruptedException if another interrupts it.
- True
- False
Correct Answer

A. True

Explanation

The join() method in Java is used to wait for a thread to die. If another thread interrupts the thread that is waiting with join(), it will throw an InterruptedException. Therefore, the given answer, "True," is correct.

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12.

Retrieve field values using reflection.
- NewInstance() on Constructor
- Invoke()
- GetField() on class
- Set()
- NewInstance() on class
Correct Answer

A. GetField() on class

Explanation

The getField() method is used to retrieve the value of a specific field in a class using reflection. It allows access to the field's value regardless of its access modifier (public, private, etc.). This method is commonly used when you want to dynamically access and manipulate the values of fields in a class at runtime.

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13.

An Annotation declaration consits of ...........followed by th anotation type.1 choice.
- Data Type
- Character
- @
- @@
Correct Answer

A. @

Explanation

An Annotation declaration consists of the "@" symbol followed by the annotation type.

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14.

Represents a word character:[a-zA-Z_0-9]
- \w
- \W
Correct Answer

A. \w

Explanation

The correct answer is \w. This regular expression represents a word character, which includes uppercase and lowercase letters, numbers, and the underscore character. It matches any single character that falls into this category.

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15.

Create objects using prameterized constructors
- Invoke()
- GetField() on class
- Set()
- NewInstance() on Constructor
- NewInstance() on class
Correct Answer

A. NewInstance() on Constructor

Explanation

The correct answer is "NewInstance() on Constructor." The NewInstance() method is used to create a new instance of a class using its constructor. It allows you to dynamically create objects at runtime by invoking the constructor with the specified parameters. This method is typically used when you don't know the class name at compile time and need to create objects dynamically based on user input or other runtime conditions.

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16.

Assign field values using reflection.
- NewInstance() on Constructor
- GetField() on class
- Invoke()
- Set()
- NewInstance() on class
Correct Answer

A. Set()

Explanation

The set() method is used to assign a value to a field using reflection. It allows you to set the value of a field even if it is private or inaccessible through normal means. This method is commonly used when you need to dynamically modify the value of a field at runtime.

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17.

Matcher Class does not have any constructors.
- True
- False
Correct Answer

A. True

Explanation

The statement is true because the Matcher class in Java does not have any constructors. This means that we cannot create an instance of the Matcher class using the new keyword. Instead, we obtain a Matcher object by invoking the matcher() method on a Pattern object. The Matcher class is used for performing match operations on a character sequence using regular expressions.

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18.

The class which consists of methods that operate at the group level, and attributes whose values are assigned and retrieved from the group
- Object class
- Runtime class
- ThreadGroup Class
Correct Answer

A. ThreadGroup Class

Explanation

The ThreadGroup class is the correct answer because it consists of methods that operate at the group level, allowing for the management of multiple threads as a single unit. It also has attributes whose values can be assigned and retrieved from the group, providing a way to control and manipulate the threads within the group. This class is specifically designed for managing thread groups in Java.

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19.

This use to find out whether a specific thread is running or not.-1 choice
- Sleep()
- IsAlive()
- Join()
- Wait()
Correct Answer

A. IsAlive()

Explanation

The correct answer is "isAlive()". This method is used to determine whether a specific thread is currently running or not. It returns a boolean value indicating the thread's status. If the thread is running, the method will return true; otherwise, it will return false. This can be helpful in situations where we need to check the status of a thread and perform certain actions based on its status.

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20.

Java use primitive data types which are not part of the object hierarchy.
- True
- False
Correct Answer

A. True

Explanation

Java uses primitive data types such as int, float, boolean, etc., which are not part of the object hierarchy. Unlike objects, primitive data types are not represented as instances of a class and do not have any methods or properties associated with them. They are used to store simple values directly in memory, making them more efficient in terms of memory usage and performance compared to objects. Therefore, the statement "Java uses primitive data types which are not part of the object hierarchy" is true.

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21.

Methods of this class allows to create, delete and rename files, provide access to the pathfile.., check the read and write access permission.
- FileInputStream class
- FileOutputStream class.
- File class
Correct Answer

A. File class

Explanation

The File class is the correct answer because it provides methods to create, delete, and rename files, as well as access the pathfile and check read and write access permissions. The FileInputStream and FileOutputStream classes are used for reading from and writing to files, respectively, but they do not provide the same functionality as the File class.

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22.

The Class which defines methods for basic numeric operations are well as trigonometric functions is called:
- System class
- Class class
- Math class
Correct Answer

A. Math class

Explanation

The Math class in Java defines methods for basic numeric operations as well as trigonometric functions. It provides functionality to perform mathematical calculations such as finding the square root, rounding numbers, calculating logarithms, and more. This class is a part of the Java standard library and is widely used in mathematical computations.

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23.

This causes a Thread to wait for some other thread to release a resouce
- Wait()
- Notify()
Correct Answer

A. Wait()

Explanation

The wait() method in Java causes a thread to wait for some other thread to release a resource. When a thread encounters the wait() method, it releases the lock it holds and enters a waiting state until another thread notifies it. This mechanism allows threads to synchronize their actions and coordinate their execution. By using wait() and notify() methods, threads can communicate and avoid resource contention issues.

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24.

Wait() method can only be invoked only from wthin the synchronised code
- True
- False
Correct Answer

A. True

Explanation

The wait() method in Java is used for inter-thread communication and can only be invoked within synchronized code. When a thread calls the wait() method, it releases the lock it holds and enters a waiting state until another thread notifies it. This is why the wait() method must be called from within synchronized code, as it ensures that the thread calling wait() holds the lock on the object it is waiting on. If the wait() method is called outside synchronized code, it will throw an IllegalMonitorStateException. Therefore, the given answer "True" is correct.

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25.

Annotations consist of names and have no value associated with it. It consist of the annotaion name and no additional data.
- Single - Value Annotations.
- Maker Annotations.
- Full Annotations.
Correct Answer

A. Maker Annotations.

Explanation

The given correct answer is "Maker Annotations". This is because the question states that annotations consist of names and have no value associated with them. Maker Annotations align with this description as they only consist of the annotation name and do not include any additional data or values.

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1
26.

This Annotation should not be used on classes, interfaces, package, or constructors. It should be used on method.
- @Deprecated
- @Documented.
- @suppressWarnings
- @Override
- @Interface
Correct Answer

A. @Override

Explanation

The "@Override" annotation is used in Java to indicate that a method is intended to override a method from a superclass or interface. This annotation helps to ensure that the method is correctly overriding the intended method and provides compile-time checking for errors. It is typically used when implementing abstract methods or overriding methods from a superclass.

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27.

This is used to negate one or more nested character classes1 choice.
- Subtraction
- Union
- Greedy
Correct Answer

A. Subtraction

Explanation

This answer is correct because the term "subtraction" refers to the use of the negation or exclusion operator within regular expressions. It is used to remove characters or character classes from a larger set. In this context, "nested character classes" refers to character classes that are enclosed within another character class. The use of subtraction allows for the removal of these nested character classes, resulting in a more specific and refined search pattern.

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28.

This is matched with a character sequence string. This is called as input Sequence.
- Pattern Class
- Matcher Class
Correct Answer

A. Pattern Class

Explanation

The correct answer is "Pattern Class" because the question mentions that the character sequence string is matched with a class, and specifically refers to "Pattern Class" as the answer.

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29.

Tries to match the input sequence against the pattern starting from beginning.
- Boolean find()
- Boolean lookingAt()
Correct Answer

A. Boolean lookingAt()

Explanation

The method "lookingAt()" is used to determine if the input sequence matches the pattern starting from the beginning. It checks if the pattern is found at the beginning of the input sequence, but does not need to match the entire input sequence. On the other hand, the "find()" method searches for any occurrence of the pattern in the input sequence, not necessarily starting from the beginning. Therefore, the correct answer is "boolean lookingAt()".

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30.

This is a technique where all characters are matched except those listed. can be represented by inserting the metacharacter "^" at the beginning of character class. - 1 choice
- Simple Classes
- Negation
- Ranges
Correct Answer

A. Negation

Explanation

This technique is called negation, where all characters except those listed are matched. By inserting the metacharacter "^" at the beginning of a character class, it indicates that any character that is not listed should be matched.

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31.

Which of the following details are not retrieved when a class is examined?
- Class name
- Constructors
- Class Field
- Package Information
- Method Information.
Correct Answer

A. Package Information

Explanation

When a class is examined, the package information is not retrieved. The package information refers to the details about the package in which the class is located, such as the package name and any related documentation. The class name, constructors, class fields, and method information are all retrieved when examining a class.

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32.

The basic form of pattern matching supported by regex- 1 choice.
- String Literal
- boolean
- Character-base
Correct Answer

A. String Literal

Explanation

The correct answer is "String Literal" because a string literal is a sequence of characters enclosed in double quotation marks. In regex, pattern matching can be done by specifying the exact string literal that needs to be matched. This allows for precise matching of specific strings in a given text or input.

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33.

Create objects using default constructors?
- NewInstance() on class
- NewInstance() on Constructor
- GetField() on class
- Set()
- Invoke()
Correct Answer

A. NewInstance() on class

Explanation

The correct answer is "NewInstance() on class". The NewInstance() method is used to create a new instance of a class using its default constructor. This method is part of the Java Reflection API and allows you to dynamically create objects at runtime. By calling NewInstance() on a class, you can create an object without explicitly calling its constructor.

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34.

Which statements are true ?- 3 choices
- Array can be identified at runtime.
- Arrays can not be created at runtime.
- Values of arrays can be retrieved during runtime
- Values to elements can be assigned to arrays at runtime.
- Array objects cannot be instantiated.
Correct Answer(s)

A. Array can be identified at runtime.
A. Values of arrays can be retrieved during runtime
A. Values to elements can be assigned to arrays at runtime.
35.

In a multithreading program two or more threads cannot run concurrently.
- True
- False
Correct Answer

A. False

Explanation

The given statement is false. In a multithreading program, two or more threads can indeed run concurrently. Each thread is an independent sequence of instructions that can be executed simultaneously with other threads. This allows for parallel execution and can lead to improved performance and responsiveness in certain scenarios.

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36.

The UNION is
- A single character class comprising of two or more separate character classes
- A single character class which matches to characters that are common to all its nested class
Correct Answer

A. A single character class comprising of two or more separate character classes

Explanation

The correct answer is a single character class comprising of two or more separate character classes. This means that the UNION operator allows us to create a single character class by combining multiple separate character classes. This allows us to match any character that belongs to any of the individual character classes within the UNION.

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37.

Represents a non - whitespace character: [^\S]
- \S
- \s
- \W
Correct Answer

A. \S

Explanation

The correct answer is \S. In regular expressions, \S represents a non-whitespace character. It matches any character that is not a space, tab, or newline.

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38.

Which are Metacharacters?- 3 choices
- #
- { }
- [ ]
- @
- *
Correct Answer(s)

A. { }
A. [ ]
A. *

Explanation

The correct answer is { }, [ ], *.

In regular expressions, metacharacters are special characters that have a symbolic meaning. The curly braces { } are metacharacters used to specify the number of occurrences of a pattern. The square brackets [ ] are used to define a character class, allowing any character within the brackets to match. The asterisk * is a metacharacter used to match zero or more occurrences of the preceding pattern. The hashtag # and the at symbol @ are not metacharacters in this context.

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39.

This is a way by which programmers can specify the byte of objects that a class can work with via parameters passed at declaration time and evaluated at compile time.
- Wildcard
- Regular Expression
- Generic
Correct Answer

A. Generic

Explanation

Generics in programming allow programmers to specify the type of objects that a class can work with by using parameters passed at declaration time. These parameters are evaluated at compile time, allowing for type safety and flexibility in working with different data types. By using generics, programmers can create reusable code that can work with multiple types of objects without the need for type casting or duplication of code.

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40.

Which statements are true?- 3 choices
- Reflection API induces code into a particular set of classes during execution.
- Reflection API retrieves the object and its interface for examination.
- Reflection API cannot manipulate classes.
- Reflection API is used to get and set values in an array.
- Reflection API cannot be used to retrieve th constructors, methods and fields in a class.
Correct Answer(s)

A. Reflection API induces code into a particular set of classes during execution.
A. Reflection API retrieves the object and its interface for examination.
A. Reflection API is used to get and set values in an array.

Explanation

The given answer is correct. The Reflection API allows code to be dynamically induced into a particular set of classes during execution. It also allows the retrieval of an object and its interface for examination. Additionally, the Reflection API can be used to get and set values in an array.

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41.

Which are not metacharacter?- 2 choices
- ?
- & &&
- . $
- ^ + -
- ! ,
Correct Answer(s)

A. & &&
A. ! ,

Explanation

The metacharacters are special characters with a special meaning in regular expressions. In this case, the metacharacters are "&", "&&", and "!". These characters have a specific purpose when used in regular expressions and are not considered regular characters. The other options, "?", ".", "$", "^", "+", "-", and ",", are not metacharacters as they do not have any special meaning in regular expressions and are treated as regular characters.

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42.

A Constructor for the Double wrapper class can be written as
- Double(Double value),Double(String str)
- Double(double value)
- Double(double value),Double(String str)
Correct Answer

A. Double(double value),Double(String str)

Explanation

The Double wrapper class in Java provides constructors that can accept either a double value or a String representation of a double value. The constructor Double(double value), Double(String str) allows the creation of a Double object by passing in either a double value or a String representation of a double value. This constructor provides flexibility in creating Double objects and allows for easy conversion between different types of representations of double values.

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43.

Occurs when a Thread is not a state to receive a request that has been made for a specific operation.
- InterruptedException
- IllegalThreadState
Correct Answer

A. IllegalThreadState

Explanation

The correct answer is "IllegalThreadState". This exception occurs when a thread is not in a state to receive a request that has been made for a specific operation. It typically happens when a method is called on a thread that is not in a valid state for that particular method. For example, if a thread is not yet started or has already terminated, and an attempt is made to call a method that is only valid for a running thread, the IllegalThreadState exception will be thrown.

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44.

The Class which subclass of all class.- 1 choice
- Class class
- Object Class
- ThreadGroup class
Correct Answer

A. Object Class

Explanation

The correct answer is Object Class because it is the superclass of all classes in Java. Every class in Java directly or indirectly extends the Object class. Therefore, it can be said that the Object class is the subclass of all classes.

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45.

Causes the current Thread to wait until the thread on which it is called terminates.- 1 choice.
- Sleep()
- Join()
- Wait()
- IsAlive()
Correct Answer

A. Join()

Explanation

The join() method is used to wait for the thread on which it is called to terminate. It causes the current thread to pause its execution and wait until the specified thread completes its execution. This is useful when we want to ensure that certain tasks are completed in a specific order or when we need to wait for a thread to finish before proceeding further in the program.

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46.

Which statements are true?- 3 choices.
- Simple class are formed by placing characters side by side
- Ranges define a character class that includes a single value
- Negation is a Technique where a metacharacter "^" is inserted at the beginning of character
- Subtraction is not used to negate one or more nested character classes
- To use an escape construct within a string literal, it must be preceded by a blackslash for the string to compile
Correct Answer(s)

A. Simple class are formed by placing characters side by side
A. Negation is a Technique where a metacharacter "^" is inserted at the beginning of character
A. To use an escape construct within a string literal, it must be preceded by a blackslash for the string to compile

Explanation

The first statement is true. Simple classes are formed by placing characters side by side. For example, [abc] represents a character class that includes the characters a, b, and c.

The second statement is true. Ranges define a character class that includes a single value. For example, [a-z] represents a character class that includes all lowercase alphabets.

The third statement is true. Negation is a technique where a metacharacter "^" is inserted at the beginning of a character class. For example, [^a] represents a character class that includes all characters except for the character a.

The fourth statement is not mentioned in the question, so we cannot determine its truthfulness.

The fifth statement is true. To use an escape construct within a string literal, it must be preceded by a backslash for the string to compile. For example, to include a double quote within a string literal, it must be escaped as \".

Therefore, the correct statements are: Simple class are formed by placing characters side by side, Negation is a Technique where a metacharacter "^" is inserted at the beginning of a character, To use an escape construct within a string literal, it must be preceded by a backslash for the string to compile.

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47.

Which statements are true?- 2 choices
- Double is a wrapper class for the floating point value of type float
- Character is a wrapper class for the primitive char data type
- A Constructor for the Byte Wrapper class can be written as Byte(bit value)
- A Constructor for the Long wrapper class can be written as Long(lg value)
- Integer is a wrapper class for the int data type.
Correct Answer(s)

A. Character is a wrapper class for the primitive char data type
A. Integer is a wrapper class for the int data type.

Explanation

Double is not a wrapper class for the floating point value of type float. The correct answer is that Character is a wrapper class for the primitive char data type and Integer is a wrapper class for the int data type.

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48.

Which statements are true?- 3 choices
- Parameters in annotation can be initialized with arrays of values
- Parameters in annotation can have null values
- Parameters in annotation are declared as a fields in a class.
- Parameters in annotation types may defne default values for some members.
- Parameters in annotation can be initialized to arrays of String values
Correct Answer(s)

A. Parameters in annotation can be initialized with arrays of values
A. Parameters in annotation types may defne default values for some members.
A. Parameters in annotation can be initialized to arrays of String values

Explanation

The given answer is correct. Parameters in annotation can be initialized with arrays of values, which means that multiple values can be passed as parameters in an annotation. Parameters in annotation types may define default values for some members, which means that if a parameter is not explicitly provided, it will take the default value defined in the annotation type. Parameters in annotation can be initialized to arrays of String values, which means that the values passed as parameters can be of type String and can be stored in an array.

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49.

Which statement are true?- 3 choices.
- A regular exp consist of symbols and syntacic elements
- Pattern and Matcher class are the classes used to perform text processing
- The java.util.regex package consist of two classes
- Find and replace are some of the operations that can be performed by regex
- The regex package uses boolean matching
Correct Answer(s)

A. A regular exp consist of symbols and syntacic elements
A. Pattern and Matcher class are the classes used to perform text processing
A. Find and replace are some of the operations that can be performed by regex

Explanation

A regular expression consists of symbols and syntactic elements, such as metacharacters and quantifiers, which are used to define a pattern for matching strings. The pattern and Matcher class are the classes used in Java to perform text processing with regular expressions. The java.util.regex package consists of these two classes. Find and replace are some of the operations that can be performed using regular expressions. The regex package uses boolean matching to determine if a string matches a given pattern.

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Mar 21, 2023

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Nov 30, 2008

Quiz Created by
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Gaj Quiz For Aptech

Annotations are comments, notes, explainations, or external remarks attached to a web document.

Quiz Preview

Invoke methods using refleftion.

Returns the start index of the previous match.

Occurs when Interrupt() or ThreadSleep() are called.

If the Thread is alive, the boolean value True is return. instead of that, return False value.

The expression [a-z&&[^abc]]

In a multitasking environment two or more processes run concurrently

Be Known as single - element, It consists of single value. It can be represented as data= value pair or value within the parenthese.

Represents A digit: [0-9]

Returns the start index of the last match plus one.

Join() method Throws InterruptedException if another interrupts it.

Retrieve field values using reflection.

An Annotation declaration consits of ...........followed by th anotation type.1 choice.

Represents a word character:[a-zA-Z_0-9]

Create objects using prameterized constructors

Assign field values using reflection.

Matcher Class does not have any constructors.

The class which consists of methods that operate at the group level, and attributes whose values are assigned and retrieved from the group

This use to find out whether a specific thread is running or not.-1 choice

Java use primitive data types which are not part of the object hierarchy.

Methods of this class allows to create, delete and rename files, provide access to the pathfile.., check the read and write access permission.

The Class which defines methods for basic numeric operations are well as trigonometric functions is called:

This causes a Thread to wait for some other thread to release a resouce

Wait() method can only be invoked only from wthin the synchronised code

Annotations consist of names and have no value associated with it. It consist of the annotaion name and no additional data.

This Annotation should not be used on classes, interfaces, package, or constructors. It should be used on method.

This is used to negate one or more nested character classes1 choice.

This is matched with a character sequence string. This is called as input Sequence.

Tries to match the input sequence against the pattern starting from beginning.

This is a technique where all characters are matched except those listed. can be represented by inserting the metacharacter "^" at the beginning of character class. - 1 choice

Which of the following details are not retrieved when a class is examined?

The basic form of pattern matching supported by regex- 1 choice.

Create objects using default constructors?

Which statements are true ?- 3 choices

In a multithreading program two or more threads cannot run concurrently.

The UNION is

Represents a non - whitespace character: [^\S]

Which are Metacharacters?- 3 choices

This is a way by which programmers can specify the byte of objects that a class can work with via parameters passed at declaration time and evaluated at compile time.

Which statements are true?- 3 choices

Which are not metacharacter?- 2 choices

A Constructor for the Double wrapper class can be written as

Occurs when a Thread is not a state to receive a request that has been made for a specific operation.

The Class which subclass of all class.- 1 choice

Causes the current Thread to wait until the thread on which it is called terminates.- 1 choice.

Which statements are true?- 3 choices.

Which statements are true?- 2 choices

Which statements are true?- 3 choices

Which statement are true?- 3 choices.