Java Programming Mock Test 5

1. Which of these process occur automatically by java run time system?

2. Which of these class is used to encapsulate IP address and DNS?

3. What will be the output of the following Java program?

 
    import java.io.*;
    class streams
    {
        public static void main(String[] args) 
        {
            try
            {
	        FileOutputStream fos = new FileOutputStream("serial");
	        ObjectOutputStream oos = new ObjectOutputStream(fos);
                oos.writeFloat(3.5);
                oos.flush();
                oos.close();
	    }
	    catch(Exception e)
            {
	        System.out.println("Serialization" + e);
                System.exit(0);
            }
	    try 
            {
	        float x;
	        FileInputStream fis = new FileInputStream("serial");
	        ObjectInputStream ois = new ObjectInputStream(fis);
                x = ois.readInt();
                ois.close();
	        System.out.println(x);		    	
	    }
	    catch (Exception e)
            {
                System.out.print("deserialization");
	        System.exit(0);
	    }
        }
    }

4. Which of these method is used to start a server thread?

5. Which of these methods return string equivalent of Boolean object?

6. Which of these class is used to create servers that listen for either local or remote client programs?

7. What will be the output of the following Java program?

 
    import java.io.*;
    class streams
    {
        public static void main(String[] args)
        {
            try
            {
	        FileOutputStream fos = new FileOutputStream("serial");
	        ObjectOutputStream oos = new ObjectOutputStream(fos);
	        oos.writeFloat(3.5);
	        oos.flush();
	        oos.close();
	    }
	    catch(Exception e)
            {
	        System.out.println("Serialization" + e);
                System.exit(0);
            }
	    try
            {
	        FileInputStream fis = new FileInputStream("serial");
	        ObjectInputStream ois = new ObjectInputStream(fis);
	        ois.close();
	        System.out.println(ois.available());		    	
	    }
	    catch (Exception e)
            {
                System.out.print("deserialization");
	        System.exit(0);
	    }
        }
    }

8. What will be the output of the following Java program?

 
    class X
    {
        int a;
        double b;
    }
    class Y extends X 
    {
	int c;
    }
    class Output 
    {
        public static void main(String args[]) 
        {
            X a = new X();
            Y b = new Y();
            Class obj;
            obj = b.getClass();
            System.out.print(obj.getSuperclass());
        }
    }

9. What will be the output of the following Java program?

 
    import java.io.*;
    class Chararrayinput
    {
        public static void main(String[] args) 
        {
	    String obj  = "abcdefgh";
            int length = obj.length();
            char c[] = new char[length];
            obj.getChars(0, length, c, 0);
            CharArrayReader input1 = new CharArrayReader(c);
            CharArrayReader input2 = new CharArrayReader(c, 1, 4);
            int i;
            int j;
            try 
            {
		while ((i = input1.read()) == (j = input2.read()))
                {
                    System.out.print((char)i);
                }
       	    } 
            catch (IOException e) 
            {
                e.printStackTrace();
	    }
	}
    }

10. Which of these method returns a smallest whole number greater than or equal to variable X?