Que.1. Which of the following is synchronized?
A: Set
B: LinkedList
C: Vector
D: WeakHashMap
Right Answer: A
Que.2. What kind of thread is the Garbage collector thread is?
A: Non daemon thread
B: Daemon thread
C: Thread with dead state
D: None of the above
Right Answer: B
Que.3. Which of the following below is true for StringBuffer?
A: Both B and C
B: When an application is to run a single thread using some changes for strings, it is advisable to use StringBuffer
C: StringBuffer class is not synchronized
D: StringBuffer is thread safe
Right Answer: A
Que.4. When a thread terminates its processing, into what state that thread enters?
A: Running state
B: Waiting state
C: Dead state
D: Beginning state
Right Answer: C
Que.5. For an interface class, All methods in an interface must not have abstract access modifier
A: True
B: False
Right Answer: A
Que.6. Which of these statements is true?
A: LinkedList extends List
B: AbstractSet extends Set
C: HashSet extends AbstractSet
D: WeakHashMap extends HashMap
Right Answer: C
Que.7. Select all the true statements from the following.
A: AbstractSet extends AbstractCollection
B: AbstractList extends AbstractCollection
C: HashSet extends AbstractSet
D: Vector extends AbstractList
E: All choices are correct.
Right Answer: E
Que.8. Which of the following statements is true?
A: A subclass is a sub set of a superclass
B: class ClassTwo extends ClassOne means ClassOne is a subclass
C: class ClassTwo extends ClassOne means ClassTow is a super class
D: the class Class is the super class of all other classes in Java.
Right Answer: A
Que.9. Which of the following statements is preferred to create a string "Welcome to Java Programming"?
A: String str = "Welcome to Java Programming"
B: String str = new String( "Welcome to Java Programming")
C: String str; str = "Welcome to Java Programming"
D: String str; str = new String ("Welcome to Java Programming")
Right Answer: A
Que.10. Which statement is true?
A: HashTable is a sub class of Dictionary
B: ArrayList is a sub class of Vector
C: LinkedList is a subclass of ArrayList
D: Vector is a subclass of Stack
Right Answer: A
Que.11. How many numeric data types are supported in Java?
A: 8
B: 4
C: 2
D: 6
Right Answer: D
Que.12. All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java __________.
A: are private
B: are serializable
C: are immutatable
D: are final
Right Answer: D
Que.13. The code snippet if ( "Welcome".trim() == "Welcome".trim() ) System.out.println("Equal"); else System.out.println("Not Equal");
will ___________.
A: compile and display Equal
B: compile and display Not Equal
C: cause a compiler error
D: compile and display NULL
Right Answer: C
Que.14. ____________ compiler coverts a byte code of one operating system to the current operating system's executable code
A: JTI
B: JJT
C: JIT
D: JVM
Right Answer: A
Que.15. A ResourceBundle is a group of related sub classes which are _____________
A: having different base names
B: sharing the same base name
Right Answer: A
Que.16. An interface contains ______________ methods
A: Non-abstract
B: Implemented
C: unimplemented
Right Answer: C
Que.17. Which of the following statements declare class Sample to belong to the payroll.admindept package?
A: package payroll;package admindept;
B: import payroll.*;
C: package payroll.admindept.Sample;
D: import payroll.admindept.*;
E: All choices are correct.
Right Answer: D
Que.18. The class java.lang.Exception is
A: protected
B: extends Throwable
C: implements Throwable
D: serializable
Right Answer: B
Que.19. Consider the following code snippet. What will be assigned to the variable fourthChar
String str = new String("Java");
char fourthChar = str.charAt(4);
A: a
B: v
C: throws StringIndexOutofBoundsException
D: null characater
Right Answer: C
Que.20. Which of the following statements is true?
A: An exception can be thrown by throw keyword explicitly.
B: An exception can be thrown by throws keyword explicitly.
Right Answer: A
A: Set
B: LinkedList
C: Vector
D: WeakHashMap
Right Answer: A
Que.2. What kind of thread is the Garbage collector thread is?
A: Non daemon thread
B: Daemon thread
C: Thread with dead state
D: None of the above
Right Answer: B
Que.3. Which of the following below is true for StringBuffer?
A: Both B and C
B: When an application is to run a single thread using some changes for strings, it is advisable to use StringBuffer
C: StringBuffer class is not synchronized
D: StringBuffer is thread safe
Right Answer: A
Que.4. When a thread terminates its processing, into what state that thread enters?
A: Running state
B: Waiting state
C: Dead state
D: Beginning state
Right Answer: C
Que.5. For an interface class, All methods in an interface must not have abstract access modifier
A: True
B: False
Right Answer: A
Que.6. Which of these statements is true?
A: LinkedList extends List
B: AbstractSet extends Set
C: HashSet extends AbstractSet
D: WeakHashMap extends HashMap
Right Answer: C
Que.7. Select all the true statements from the following.
A: AbstractSet extends AbstractCollection
B: AbstractList extends AbstractCollection
C: HashSet extends AbstractSet
D: Vector extends AbstractList
E: All choices are correct.
Right Answer: E
Que.8. Which of the following statements is true?
A: A subclass is a sub set of a superclass
B: class ClassTwo extends ClassOne means ClassOne is a subclass
C: class ClassTwo extends ClassOne means ClassTow is a super class
D: the class Class is the super class of all other classes in Java.
Right Answer: A
Que.9. Which of the following statements is preferred to create a string "Welcome to Java Programming"?
A: String str = "Welcome to Java Programming"
B: String str = new String( "Welcome to Java Programming")
C: String str; str = "Welcome to Java Programming"
D: String str; str = new String ("Welcome to Java Programming")
Right Answer: A
Que.10. Which statement is true?
A: HashTable is a sub class of Dictionary
B: ArrayList is a sub class of Vector
C: LinkedList is a subclass of ArrayList
D: Vector is a subclass of Stack
Right Answer: A
Que.11. How many numeric data types are supported in Java?
A: 8
B: 4
C: 2
D: 6
Right Answer: D
Que.12. All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java __________.
A: are private
B: are serializable
C: are immutatable
D: are final
Right Answer: D
Que.13. The code snippet if ( "Welcome".trim() == "Welcome".trim() ) System.out.println("Equal"); else System.out.println("Not Equal");
will ___________.
A: compile and display Equal
B: compile and display Not Equal
C: cause a compiler error
D: compile and display NULL
Right Answer: C
Que.14. ____________ compiler coverts a byte code of one operating system to the current operating system's executable code
A: JTI
B: JJT
C: JIT
D: JVM
Right Answer: A
Que.15. A ResourceBundle is a group of related sub classes which are _____________
A: having different base names
B: sharing the same base name
Right Answer: A
Que.16. An interface contains ______________ methods
A: Non-abstract
B: Implemented
C: unimplemented
Right Answer: C
Que.17. Which of the following statements declare class Sample to belong to the payroll.admindept package?
A: package payroll;package admindept;
B: import payroll.*;
C: package payroll.admindept.Sample;
D: import payroll.admindept.*;
E: All choices are correct.
Right Answer: D
Que.18. The class java.lang.Exception is
A: protected
B: extends Throwable
C: implements Throwable
D: serializable
Right Answer: B
Que.19. Consider the following code snippet. What will be assigned to the variable fourthChar
String str = new String("Java");
char fourthChar = str.charAt(4);
A: a
B: v
C: throws StringIndexOutofBoundsException
D: null characater
Right Answer: C
Que.20. Which of the following statements is true?
A: An exception can be thrown by throw keyword explicitly.
B: An exception can be thrown by throws keyword explicitly.
Right Answer: A
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