Java Programming Quiz

1. The class which inherits the properties of other is known as ________

superclass
parent class
subclass
None of the above

2. What does an interface contain?

Method definition
Method declaration
Method declaration and definition
Method name

3. What will be the output of the program?

  
int arr[] = new int [5];
System.out.print(arr);

0
value stored in arr[0].
0
Class name@ hashcode in hexadecimal form

4. Which of these keywords is used by a class to use an interface defined previously?

Import
import
implements
Implements

5. Which of the following for loop declaration is not valid?

for ( int i = 99; i >= 0; i / 9 )
for ( int i = 7; i <= 77; i += 7 )
for ( int i = 20; i >= 2; - -i )
for ( int i = 2; i <= 20; i = 2* i )

6. Which statement is true?

An Error that might be thrown in a method must be declared as thrown by that method, or be handled within that method.
Multiple catch statements can catch the same class of exception more than once.
A try statement must have at least one corresponding catch block.
Except in case of VM shutdown, if a try block starts to execute, a corresponding finally block will always start to execute.

7. What is the priority of the thread in output of this program?

class multithreaded_programing
{
	public static void main(String args[])
	{
		Thread t = Thread.currentThread();
		t.setName("New Thread");
		System.out.println(t.getName());
	}
}

main
Thread
New Thread
Thread[New Thread,5,main].

8. In Java, a sequence of data is known as a stream.

TRUE
FALSE
Can be true or false
Can not say

9. What is the output of this program?

class Main
{
public static void main(String args[])
    {
     try
     {       System.out.print("A");
      throw new NullPointerException ("Hello");
     }
     catch(ArithmeticException e)
     {
      System.out.print("B");
     }
    }
}

A
B
Hello
NullPointerException

10. What will be the output of the program?

class multithreaded_programing
{
	public static void main(String args[])
	{
		Thread t = Thread.currentThread();
		t.setName("New Thread");
		System.out.println(t);
	}
}

Thread[5,main].
Thread[New Thread,5].
Thread[main,5,main].
Thread[New Thread,5,main]