SCJP

·          Two public classes in the same file.

Ans:  public class All{public class Test1 { }public class Test2 { }}

·          Main method calling a non-static method.

Ans:          Class A(){public String call(){……….};}

                                 Class B{public static void main(String[]  args) { A a1= new A(); a1.call();}}

·          Methods with the same name as the constructor(s).

Ans : Yes

       public class All {All(){System.out.println("Constructor");}

       public String All(){System.out.println("Method");return "none";}

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

·          If no user defined constructor is provided for a class, compiler initializes member variables to its default values.

Ans:         numeric data types are set to 0

char data types are set to null character(‘’)

reference variables are set to null.

·          In order to create a Constructor  follow the  rules

Ans:          It has the same name as the class

 It should  not return a value not even void

                                                                  

·          Thread initiation with classes that don’t have a run () method.

Ans:

public class All extends Thread{

public void run()  /* It calls  super.run()  if no run implementation if  extends thread class */

{System.out.println("Run method is  not mandatory and optional  if class extends Thread class");}

public static void main(String args[]){All a= new All();a.start();}

public class All implements Runnable{

public void run(){

System.out.println("Run implementation is mandatory if class Implements Runnable Interface");

}             

public static void main(String args[]){All a= new All();Thread t= new Thread(a);t.start();}

·          Difference Between Run and Start methods in Threading

Ans:

                     The start () method creates a new thread, that executes the run() method.

                     The run () method just executes in the current thread, without starting a new thread.

 Remaining questions will be updated shortly......