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- 1.Which of the following are true about ResultSet? (Choose 2)
- A.
Atleast one record should be there in the ResultSet onopening a query (or) table
- B.
Not all ResultSets are updatable
- C.
The ResultSet object contains null, if there are no records inthe table
- D.
It is possible to delete records through ResultSet
- E.
All ResultSet, are Scrollable
- 2.Consider the following code: import java.util.*; public class Code10 { { final Vector v; v=new Vector(); } public Code10() { } public void codeMethod() { System.out.println(v.isEmpty()); } public static void main(String args[]) { new Code10().codeMethod(); } } Which of the following will be the output for the above code?
- A.
Prints: false
- B.
Runtime error: NullPointerException
- C.
Compilation error: cannot find the symbol
- D.
Compilation error: v is not initialised inside the constructor
- E.
Prints: true
- 3.Consider the following scenario: Mr.Vijay is working for a Software Company. He needs to save and reload objects from a Java application. He needs to write a module to accomplish the same. Which of the following options can be used to accomplish the above requirement?
- A.
Writable interface
- B.
Readable interface
- C.
ObjectSerializable interface
- D.
Cloneable interface
- E.
Serializable interface
- 4.class InOut{ String s= new String("Between"); public void amethod(final int iArgs){ int iam; class Bicycle{ public void sayHello(){ ...Line 1 } }//End of bicycle class }//End of amethod public void another(){ int iOther; } } Which of the following statements would be correct to be coded at ...Line 1? (Choose 2)
- A.
System.out.println(iOther);
- B.
System.out.println(iam);
- C.
System.out.println(iArgs);
- D.
System.out.println(s);
- 5.Which of the following modifiers cannot be used with the abstract modifier in a method declaration?(Choose 3)
- A.
Synchronized
- B.
Final
- C.
Public
- D.
Protected
- E.
Private
- 6.Consider the following code: public class LabeledBreak2 { public static void main(String args[]) { loop: for(int j=0; j<2; j++) { for(int i=0; i<10; i++) { if(i == 5) break loop; System.out.print(i + " "); } } } } Which of the following will be the output for the above code?
- A.
0 1 2 3 4 5
- B.
Indefinite Loop
- C.
1 2 3 4 5
- D.
0 1 2 3 4
- E.
0 1 2 3 4 0 1 2 3 4
- 7.Consider the following code: public class Key1 { public boolean testAns( String ans, int n ) { boolean rslt; if (ans.equalsIgnoreCase("YES") & n > 5) rslt = true; return rslt; } public static void main(String args[]) { System.out.println(new Key1().testAns("no", 5)); } } Which of the following will be the output of the above program?
- A.
NO
- B.
True
- C.
Compile-time error
- D.
Runtime Error
- E.
False
- 8.Which of the following is the immediate super interface of CallableStatement?
- A.
CallableStatement
- B.
PreparedStatement
- C.
ResultSet
- D.
Statement
- E.
Connection
- 9.Consider the following code: public class UnwiseThreads implements Runnable { public void run() { while(true) { } } public static void main(String args[]) { UnwiseThreads ut1 = new UnwiseThreads(); UnwiseThreads ut2 = new UnwiseThreads(); UnwiseThreads ut3 = new UnwiseThreads(); ut1.run(); ut2.run(); ut3.run(); } } Which of the following is correct for the above given program?
- A.
Compilation error "ut2.run() is never reached"
- B.
The code compiles and runs 3 non ending non daemon threads
- C.
The code compiles but runs only 1 non ending, non daemon thread
- D.
Runtime Error "IllegalThreadStateException"
- 10.Which of the following is the best-performing implementation of Set interface?
- A.
LinkedHashSet
- B.
TreeSet
- C.
Hashtable
- D.
SortedSet
- E.
HashSet
- 11.12 Consider the following scenario: Real Chocos Private Limited deals in manufacturing variety of chocolates. This organization manufactures three varieties of chocolates. 1. Fruit Chocolates 2. Rum Chocolates 3. Milk Chocolates A software system needs to be built. Which of the following options identifies the Classes and Objects?
- A.
Class: Real Chocos Private Limited Objects: Chocolate
- B.
Class: Chocolate Objects: Fruit Chocolates, Rum Chocolates, Milk Chocolates
- C.
Class: Choclate Objects: Milk Chocolates
- D.
Class: Fruit Chocolates Objects: Rum Chocolates
- 12.Consider the following code snippet: class Animal { String name; public boolean equals(Object o) { Animal a = (Animal) o; // Code Here } } class TestAnimal { public static void main(String args[]) { Animal a = new Animal(); a.name = "Dog"; Animal b = new Animal(); b.name = "dog"; System.out.println(a.equals(b)); } } Which of the following code snippets should be replaced for the comment line (//Code Here) in the above given code, to get the output as true?
- A.
Return this.name.equalsIgnoreCase(a.name);
- B.
Return this.name.equals(a.name);
- C.
Return super.equals(a);
- D.
Return this.name == a.name;
- E.
Return this.name.hashCode() == a.name.hashCode();
- 13.Consider the following code: class A { } class B extends A { } public class Code2 { public void method(A a) { System.out.println("A"); } public void method(B b) { System.out.println("B"); } public static void main(String args[]) { new Code2().method(new Object()); } } Which of the following will be the output for the above code?
- A.
Throws ClassCastException at runtime
- B.
Prints: B
- C.
Compilation Error 'Cannot find the symbol'
- D.
Prints: A
- 14.Consider the following code: class Planet { } class Earth extends Planet { } public class WelcomePlanet { public static void welcomePlanet(Planet planet) { if (planet instanceof Earth) { System.out.println("Welcome!"); } else if (planet instanceof Planet) { System.out.println("Planet!"); } else { System.exit(0); } } public static void main(String args[]) { WelcomePlanet wp = new WelcomePlanet(); Planet planet = new Earth(); welcomePlanet(planet); } } Which of the following will be the output of the above program?
- A.
An exception is thrown at runtime
- B.
Planet!
- C.
The code runs with no output
- D.
Welcome!
- E.
Compilation fails
- 15.Consider the following code: public class Code13 { public static void main(String... args) { for(String s:args) System.out.print(s + ", "); System.out.println(args.length); } } Which of the following will be the output if the above code is attempted to compile and execute?
- A.
Program compiles successfully and prints the passed arguments as comma separated values and finally prints the length of the arguments-list
- B.
Runtime Error: NoSuchMethodError
- C.
Variable arguments cannot be used with enhanced for-loop
- D.
Compilation Error: var-args cannot be used as arguments for main() method
- 16.Consider the following code: class UT1 { static byte m1() { final char c = 'u0001'; return c; } static byte m3(final char c) {return c;} public static void main(String[] args) { char c = 'u0003'; System.out.print(""+m1()+m3(c)); } } Which of the following gives the valid output of the above code?
- A.
Compile-time error
- B.
Prints: 13
- C.
Run-time error
- D.
Prints: 4
- E.
None of the listed options
- 17.An Annotation Type ________________.
- A.
Is a meta-tag used to pass message between the code and JVM.
- B.
Defines the structure of an interface
- C.
Defines the structure of an Application
- D.
Defines the structure of an Object
- E.
Defines the structure of an Annotation
- 18.Which of the following are correct regarding HashCode?(Choose 2)
- A.
It improves performance
- B.
The numeric key is unique
- C.
It is a 32 bit numeric digest key
- D.
HashCode() is defined in String class
- E.
HashCode() value cannot be a zero-value
- 19.Given the following object hierarchy and code for the upgrade method: java.lang.Object +----mypkg.BaseWidget | +----TypeAWidget // the following is a method in the BaseWidget class 1. public TypeAWidget upgrade( ){ 2. TypeAWidget A = (TypeAWidget) this; 3. return A; 4. } Which of the following will be the result of the below statements? 5. BaseWidget B = new BaseWidget(); 6. TypeAWidget A = B.upgrade();
- A.
The compiler would object to line 2.
- B.
A runtime ClassCastException would be generated in line 2.
- C.
As this referes to the BaseWidget, a parent can accept itschild
- D.
After line 6 executes, the object referred to as A will in factbe a TypeAWidget.
- 20.Consider the following program: public class ThreadJoin extends Thread{ public static void main(String[] args) { Thread t1 = new Thread("T1"); Thread t2 = new Thread("T2"); try { t1.join(); t2.join(); } catch (InterruptedException e) { System.out.println("Main Thread interrupted."); } } public void run(){ System.out.println("Run executed"); } } What will be the output of the above program?
- A.
Run-time error
- B.
Compile-time error
- C.
Prints "Main Thread interrupted."
- D.
Program ends without printing anything
- E.
Prints "Run executed" twice
- 21.Which are all platform independent among the following? (Choose 3)
- A.
JAR Files
- B.
Java Virtual Machine (JVM)
- C.
Java Development Kit (JDK)
- D.
Java Class Files
- E.
Java Source Files
- 22.Which of the following options is true about multiple inheritance?
- A.
Inheriting from a class which is already in an inheritancehierarchy
- B.
Inheriting from more than one super class
- C.
Inheriting from two super classes
- D.
Inheriting from a single class
- 23.Which of the following options give the names of data structures that can be used for elements that have ordering, but no duplicates? (Choose 2)
- A.
List
- B.
SortedSet
- C.
Set
- D.
ArrayList
- E.
TreeSet
- 24.Which of the following options are true for StringBuffer class?(choose 3)
- A.
'capacity' property indicates the maximum number ofcharacters that a StringBuffer can have
- B.
StringBuffer is extended from String class
- C.
StringBuffer implements Charsequence interface
- D.
StringBuffer is threadsafe
- E.
Buffer space in StringBuffer can be shared
- 25.Consider the following partial code: public class CreditCard { private String cardID; private Integer limit; public String ownerName; public void setCardInformation(String cardID, String ownerName, Integer limit) { this.cardID = cardID; this.ownerName = ownerName; this.limit = limit; } } Which of the following statement is True regarding the above given code?
- A.
The class is fully encapsulated
- B.
The setCardInformation method breaks encapsulation
- C.
The code demonstrates polymorphism
- D.
The cardID and limit variables break polymorphism
- E.
The ownerName variable breaks encapsulation
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