Java Serialization Test – 1

1. Which of these is a method of ObjectOutput interface used to finalize the output state so that any buffers are cleared?

2. Which of these process occur automatically by the java runtime system?

3. Which of these is an interface for control over serialization and deserialization?

4. 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();
	    }
	}
    }

5. Which of these interface extends DataOutput interface?

6. Which of these is method of ObjectOutput interface used to write the object to input or output stream as required?

7. Which of these is a process of writing the state of an object to a byte stream?

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

 
    import java.io.*;
    class serialization 
    {
        public static void main(String[] args) 
        {
            try 
            {
                Myclass object1 = new Myclass("Hello", -7, 2.1e10);
	        FileOutputStream fos = new FileOutputStream("serial");
	        ObjectOutputStream oos = new ObjectOutputStream(fos);
                oos.writeObject(object1);
                oos.flush();
                oos.close();
	    }
	    catch(Exception e) 
            {
	        System.out.println("Serialization" + e);
                System.exit(0);
            }
	    try  
            {
                Myclass object2;
	        FileInputStream fis = new FileInputStream("serial");
	        ObjectInputStream ois = new ObjectInputStream(fis);
                object2 = (Myclass)ois.readObject();
                ois.close();
	        System.out.println(object2);		    	
	    }
	    catch (Exception e) 
            {
                System.out.print("deserialization" + e);
	        System.exit(0);
	    }
        }
    }
    class Myclass implements Serializable 
    {
	String s;
	int i;
	double d;
        Myclass (String s, int i, double d)
        {
	    this.d = d;
	    this.i = i;
	    this.s = s;
	}
    }

9. 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);
	    }
        }
    }

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

 
    import java.io.*;
    class serialization 
    {
        public static void main(String[] args) 
        {
            try 
            {
                Myclass object1 = new Myclass("Hello", -7, 2.1e10);
	        FileOutputStream fos = new FileOutputStream("serial");
	        ObjectOutputStream oos = new ObjectOutputStream(fos);
                oos.writeObject(object1);
                oos.flush();
                oos.close();
	    }
	    catch(Exception e) 
            {
	        System.out.println("Serialization" + e);
                System.exit(0);
            }
	    try
            {
	        int 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);
	    }
        }
    }
    class Myclass implements Serializable
    {
	String s;
	int i;
	double d;
        Myclass(String s, int i, double d)
        {
	    this.d = d;
	    this.i = i;
	    this.s = s;
	}
    }