Core Java : Experts

1. Which methods is not used while Serialization and DeSerialization in java?

writeObject()
readExternal()
readObject()
readWriteObject()

2. Which methods is used to make raw MIME formatted string?

parse()
parseString()
getString()
toString()

3. What will be the output of the code ________?

    import java.util*; 

        class test
        
            {

                public static void main(String args[]) 
                
                    {

                        ArrayLitt obj = new ArrayList();

                        obj.add("P");

                        obj.add("Q");

                        obj.add("R");

                        obj.add(1, "S");

                        System.out.println(obj);        

                    }

            }

[P,Q,R,S].
[P,S,Q,R].
[P,Q,R].
[P,Q,R]

4. What will be the output of the code ________?

    import java.util*; 

        class Output
        
            {

                public static void main(String args[]) 
                
                    {

                        ArrayList obj = new ArrayList();

                        obj.add("X");

                        obj.add(0, "Y");

                        System.out.println(obj.size());       

                    }

            }

0
1
2
Garbage value

5. What exception is thrown by parseInt() method

NullPointerException
ArithmeticException
NumberFormatException
ClassNotFoundException

6. What will be the output of the code ________?

    class multithreaded

        {

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

7. What will be the output of the code ________?

    class multithreaded

	    {

            public static void main(String args[])
            
	        {

                Thread t = Thread.currentThread();
                
                System.out.println(t.isAlive());    
                    
            }
            
	    }

0
1
true
false

8. What will be the output of the code if the given input is 'abcqfghqbcd'?

    class Input_Output
    
        {

            public static void main(String args[]) throws IOException

            {	 

                char c;

                BufferedReader obj = new BufferedReader(new InputStreamReader(System.in));

                do

                    {

                        c = (char) obj.read();

                        System.out.print(c);

                    } while(c != 'q');
            }
        }

abcqfgh
abc
abcq
abcqfghq

9. What will be the output of the code ________?

    class output

	    {

                public static void main(String args[])

	        {

                    StringBuffer c = new StringBuffer("Hello");
                    
                    System.out.println(c.length());
                
                }
            
	    }

4
5
6
7

10. What will be the output of the code ________?

    class output

        {

            public static void main(String args[])

                {

                    StringBuffer s1 = new StringBuffer("Hello");

                    StringBuffer s2 = s1.reverse();

                    System.out.println(s2);

                }	    
        }

Hello
olleH
HelloolleH
olleHHello