1. What is the output when Test01 class is run ?

class A{

	A(){
		//some initialization
	}

	void do_something(){
		System.out.println("I'm in A");
	}
};

class B extends A{

	B(){
		//some initialization
	}

	void do_something(){
		System.out.println("I'm in B");
	}
};

class Test01{

	public static void main(String args[]){
		A a = new B();
		a.do_something();
	}
};

Options :

1. I'm in A
2. I'm in B
3. Compiler error , A a = new B ( ) : Explicit cast needed to convert A to B
4. ClassCastException thrown at runtime

2. What is the output for the following code ?

class Q014{
	
	public String get(int i){
		return null;
	}
	
	public static void main(String ka[]){
		System.out.println((new Q014()).get(1));
	}
};

Options :

1. 0
2. NullPointerException at run-time
3. Compile error
4. null

3.What is the output ?

class Q018{
	static Object obj;
	static String get(){
		return null;
	}

	public static void main(String args[]){
		System.out.println((Q018.get()) == (Q018.obj));
	}
};

Options :

1. Compile error
2. Run-time error
3. true
4. false

4. What is the output ?

class Q015{
	
	public String get(int i){
		return null;
	}
	
	public static void main(String ka[]){
		Q015 obj = new Q015();
		Object i = obj.get(10);
		System.out.println(i.toString());
	}
};

Options :

1. null
2. NullPointerException at run-time
3. Compile error
4. 0

5.What is the output ?

class Q013{
	int i;

	Q013(int i){
		System.out.println(i);

	}

	public static void main(String ka[]){
		Q013 obj = new Q013(10);
		System.out.println(obj.i);
	}

}

Options :

1. 10
   10
2. Compile error , System.out.println ( obj.i ) : variable i may not have been initialized
3. 0
   10
4. 10
   0

6. What is the output ?

class Test02{

	public String fetch(){
		return null;
	}

	public static void main(String args[]){
		Test02 obj = new Test02();
		String str = obj.fetch();
		System.out.println((str+"").toString());
	}
};

Options :

1. null
2. Compiler error , can't invoke a method on null
3. NullPointerException thrown at runtime
4. ClassCastException thrown at runtime

7. What is the output ?

class Q022{
	public static void main(String ka[]){
		while(false){
			System.out.println("Great");
		}
	}
};

Options :

1. Run's with no output
2. Run-time error " Statement not reached."
3. Great
4. Compiler error , System.out.println ( "Great") : statement not reached

8. What is the output ?

class A{
	static int i;	

	private int get(){
		return 1;
	}
};

class B extends A{

	private int get(){
		return 2;
	}
};

class Q027 extends B{

	public static void main(String ka[]){
		Q027 obj = new Q027();
		System.out.println(obj.get());
	}
};

Options :

1. 2
2. Compile error , System.out.println ( obj.get ( ) ) : no method matching get ( ) found in class Q027
3. 1
4. 2
5. NullPointerException thrown at run-time .

9. What is the output ?

class Q029{
	public static void main(String args[]){
		boolean b[] = new boolean[2];
		System.out.println(b[1]);
	}
};

Options :

1. Compile error " Variable b may not have been initialized."
2. Run-time error " Variable b may not have been initialized."
3. false
4. true

10. Consider the following applet . Is there something wrong with it ? Choose the most appropriate option ( only one ) .

public class App_Test extends Applet{

	App_Test(){
		//some initialization
	}

	public void paint(Graphics g){
		g.drawString("Applet started" , 50 , 50);
	}
};

Options :

1. Nothings wrong with it
2. It should override the init ( ) method of it's superclass ( Applet )
3. An applet subclass can't override the default constructor
4. The drawString ( ) method in paint ( ) has wrong number of arguments
5. The constructor of App_Test must be defined as public

Answers :

1. b
2. d
3. c
4. b
5. d
6. a
7. d
8. b
9. c
10. e