Java LinkedIn Assessment Quiz: Practice Now!
-
What is the default value of a boolean variable in Java?
-
True
-
False
-
Null
-
0
-
Prepare for the LinkedIn assessment Java test with our targeted quiz! Designed to help you master the key concepts of Java, this quiz covers everything from basic syntax to advanced programming topics. Whether you’re new to Java or looking to refine your skills, this quiz provides a valuable opportunity to test your knowledge and improve your performance for the LinkedIn assessment.
It includes questions on variables, loops, functions, data structures, object-oriented programming, and more. By taking this quiz, you’ll familiarize yourself with the type of questions you might encounter, while enhancing your problem-solving abilities and coding efficiency. With detailed explanations for each answer, this quiz ensures you not only learn the correct solutions but also understand the reasoning behind them. Take the LinkedIn assessment Java quiz today and boost your chances of acing the test and advancing your career!
.webp "Java LinkedIn Assessment Quiz: Practice Now! - Quiz")
Quiz Preview
- 2.
Which of the following is not a valid Java keyword?
-
For
-
Switch
-
Class
-
Byte
Correct Answer
A. ByteExplanation
Byte is a valid Java keyword, while for, switch, and class are also Java keywords. Therefore, byte is not the correct answer. The confusion might arise because all of the options are indeed Java keywords. However, the question is designed to test the knowledge that byte is the only data type listed here, whereas for, switch, and class are reserved keywords in Java for controlling loops, defining classes, and structuring the flow of control.Rate this question:
-
- 3.
How do you declare an array of integers in Java?
-
Int[] arr;
-
Arr[] int;
-
Int arr[];
-
Both A and C
Correct Answer
A. Both A and CExplanation
Arrays in Java can be declared using either int[] arr; or int arr[];—both are correct syntaxes to declare an array. Both formats are valid and perform the same operation, which is creating an array that holds integers. The only difference is the positioning of the brackets. The choice of syntax can depend on coding style or conventions, but functionality-wise, there is no difference between the two. In Java, arrays are considered objects, and this syntax allows the array to be properly instantiated and used.Rate this question:
-
- 4.
What is the size of a char in Java?
-
1 byte
-
2 bytes
-
4 bytes
-
8 bytes
Correct Answer
A. 2 bytesExplanation
In Java, the char data type is 2 bytes, which is sufficient to represent all characters from the Unicode character set. A char in Java is not just a single byte but 2 bytes (16 bits), which allows it to hold a wide range of characters, including all ASCII characters and extended characters that are part of the Unicode character set. This enables Java to work with a vast array of international text and symbols, making it capable of handling diverse character sets across different platforms.Rate this question:
-
- 5.
Which of the following is the correct way to create an object of a class in Java?
-
Class obj = new Class();
-
Class obj = Class();
-
Class obj = new Class;
-
Class obj = new Class[];
Correct Answer
A. Class obj = new Class();Explanation
In Java, objects are created using the new keyword followed by the class constructor. Therefore, Class obj = new Class(); is the correct syntax. When creating an object of a class, Java uses the new keyword to allocate memory and then calls the constructor to initialize the object. This is essential for creating instances of classes that are used to represent real-world entities or concepts in object-oriented programming.Rate this question:
-
- 6.
What is the result of 5 / 2 in Java?
-
2
-
2.5
-
2
-
Error
Correct Answer
A. 2Explanation
Java performs integer division when both operands are integers. Therefore, 5 / 2 results in 2, as the remainder is discarded in integer division. In Java, when both operands are integers, the result of division is truncated to the nearest integer. This means that the fractional part of the result is discarded. For example, 5 / 2 results in 2 because Java discards the remainder 0.5 and only keeps the integer part.Rate this question:
-
- 7.
Which method is used to find the length of a string in Java?
-
GetLength()
-
Length()
-
Size()
-
Length
Correct Answer
A. LengthExplanation
The length method is used to find the length of a string in Java. It returns the number of characters in the string. This method is an important part of Java's String class. It helps to determine how many characters a string holds, whether it's an empty string or a very long sequence of characters. It is different from the length() method of arrays, as length without parentheses is used for arrays, while length() with parentheses is used for strings.Rate this question:
-
- 8.
How do you declare a constant in Java?
-
Const int x = 10;
-
Final int x = 10;
-
Constant int x = 10;
-
Int x = final 10;
Correct Answer
A. Final int x = 10;Explanation
In Java, constants are declared using the final keyword, which indicates that the value cannot be changed after initialization. The final keyword in Java is used to create constants, which are variables whose value cannot be modified once assigned. This is useful for situations where the value is meant to remain constant throughout the program, such as for defining mathematical constants or configuration settings that should not change.Rate this question:
-
- 9.
What will be the output of the following code snippet: System.out.println(10 + 20 + "Java");
-
30 Java
-
1020 Java
-
Java 30
-
Error
Correct Answer
A. 1020 JavaExplanation
The + operator in Java is left-associative. Therefore, 10 + 20 results in 30, and then 30 + "Java" results in the string "30 Java". The + operator in Java is used for both arithmetic addition and string concatenation. When performing arithmetic operations, the operator adds the numbers. However, when one of the operands is a string, it concatenates the values as strings. In this case, the numbers are added first, then the result is concatenated with the string.Rate this question:
-
- 10.
What is the correct way to comment a block of code in Java?
-
/* comment */
-
// comment
-
# comment
-
-- comment
Correct Answer
A. /* comment */Explanation
In Java, multi-line comments are enclosed between /* and */. Single-line comments use //. These are used for commenting blocks of code. Java allows developers to add comments in the code, which are ignored during execution but are useful for documentation purposes or to temporarily disable code. Single-line comments are used for brief explanations, while multi-line comments are suitable for longer descriptions, such as documenting functions or explaining complex sections of code.Rate this question:
-
- 11.
Which access modifier allows a variable or method to be accessible only within its class?
-
Public
-
Private
-
Protected
-
Default
Correct Answer
A. PrivateExplanation
The private access modifier restricts the visibility of variables and methods to only within the class they are declared in. This is one of the four access modifiers in Java, and it is used to ensure that the data or methods are encapsulated within the class and not accessible by outside classes. This promotes the principle of encapsulation in object-oriented programming, helping to maintain the integrity of the object’s state.Rate this question:
-
- 12.
What is the default value of a String in Java when declared but not initialized?
-
Null
-
Empty string
-
Undefined
-
$0
Correct Answer
A. NullExplanation
In Java, the default value of a String variable is null when it is declared but not initialized. String is a reference type in Java, which means that it holds a reference to the actual data stored in memory. When a String is declared without initialization, it is automatically assigned the value null, indicating that it does not yet reference any object or memory location.Rate this question:
-
- 13.
How can you create a Thread in Java?
-
Implement the Runnable interface
-
Extend the Thread class
-
Both A and B
-
Neither A nor B
Correct Answer
A. Both A and BExplanation
In Java, a thread can be created either by implementing the Runnable interface or by extending the Thread class. Both are valid methods for creating threads. The Runnable interface provides a way to define tasks that can be executed by a thread, while extending the Thread class allows the creation of a thread by overriding the run method. Both methods are commonly used in multi-threaded applications, depending on the need for flexibility or inheritance.Rate this question:
-
- 14.
Which of the following data types can hold decimal values in Java?
-
Int
-
Float
-
Char
-
Boolean
Correct Answer
A. FloatExplanation
float and double are used to hold decimal values in Java. The float data type holds single-precision floating-point values, while double holds double-precision. This distinction is important because double provides more precision and is the default choice for most decimal calculations in Java. float is typically used when memory consumption is a concern, but double is more commonly used in scientific or financial calculations where accuracy is crucial.Rate this question:
-
Quiz Review Timeline (Updated): Jun 8, 2025 +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jun 08, 2025Quiz Edited by
ProProfs Editorial Team -
May 27, 2025Quiz Created by
Kasturi Chaudhuri
Back to top