Java Springs Online Exams Model Test2

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Test your caliber

1.The class java.lang.Exception is _____.
protected	extends Throwable
implements Throwable	serializable

2.Which of the following statements is true?
An exception can be thrown by throw keyword explicitly	An exception can be thrown by throws keyword explicitly
Both of same	None

3.All the wrapper classes (Integer, Boolean, Float, Short, Long, Double and Character) in java
are private	are serializable
are immutatable	are final

4. The code snippet if( "Welcome".trim() == "Welcome".trim() ) System.out.println("Equal"); else System.out.println("Not Equal"); will
compile and display “Equal”	compile and display “Not Equal”
cause a compiler error	compile and display NULL

5.Consider the following code snippet. What will be assigned to the variable fourthChar, if the code is executed? String str = new String(“Java”); char fourthChar = str.charAt(4);
‘a’	static Program
throws StringIndexOutofBoundsException	null character

6.Which of the following statements is preferred to create a string "Welcome to Java Programming"?
String str = “Welcome to Java Programming”	String str = new String( “Welcome to Java Programming” )
String str; str = “Welcome to Java Programming”	String str; str = new String (“Welcome to Java Programming” )

7.Which of the following statements is true?
A super class is a sub set of a sub class	class ClassTwo extends ClassOne means ClassOne is a subclass
class ClassTwo extends ClassOne means ClassTow is a super class	the class Class is the super class of all other classes in JavA

8.What kind of thread is the Garbage collector thread is?
Non daemon thread	Daemon thread
Thread with dead state	None of the above

9.When a thread terminates its processing, into what state that thread enters?
Running state	Waiting state
Dead state	Beginning state

10.Which statement is true?
HashTable is a sub class of Dictionary	ArrayList is a sub class of Vector
LinkedList is a subclass of ArrayList	Vector is a subclass of Stack

11.Which of these statements is true?
LinkedList extends List	AbstractSet extends Set
HashSet extends AbstractSet	WeakHashMap extends HashMap

12.Which of the following is synchronized?
Set	LinkedList
Vector	WeakHashMap

13.Select all the true statements from the following.
AbstractSet extends AbstractCollection	AbstractList extends AbstractCollection
HashSet extends AbstractSet	All of the above

14.Which of the methods should be implemented if any class implements the Runnable interface?
start()	run()
wait()	notify() and notifyAll()

15.A thread which has invoked wait() method of an object, still owns the lock of the object. Is this statement true or false?
True	False
Both of the above	None

16.Which of the following is not a method of the Thread class.
public void run()	public void start()
public void exit()	public final int getPriority()

17.To execute the threads one after another
the keyword synchronize is used	the keyword synchronizable is used
the keyword synchronized is used	None of the above

18.The object of DataInputStream is used to _____.
To covert binary stream into character stream	To covert character stream into binary stream
To write data onto output object	All of the above

19.DataInputStream is an example of _____.
Output stream	I/O stream
Filtered stream	File stream

20.From a MVC perspective, Struts provides the ___.
Model	View
Controller	None