public class Outer {
 int instanceVariableOne;
 private class Inner {
  int a, b;
  public Inner(int x, int y)
  {
   instanceVariableOne = x;
   a = x * 2;
   instanceVariableTwo = y;
   b = y * 2;
  }
 }
 int instanceVariableTwo;
 
    public Outer()
    {
     Inner test = new Inner(1, 2);
     System.out.println("a from Inner\tb from Outer\n" + test.a + "\t\t\t\t" + test.b);
     System.out.println("\nOne\tTwo");
     System.out.println(instanceVariableOne + "\t" + instanceVariableTwo);
    }
 
    public static void main(String[]args)
    {
     new Outer();
    }
}

public class Temp
{
    public static class Inner
    {
        private int temp_ ;
 
        public Inner ( int temp )
        {
            temp_ = temp ;
        }
 
        public Inner ( )
        {
            temp_ = 100 ;
        }
 
        public void main (String args [])
        {
            System.out.print ( "Helo Inner" ) ;
        }
 
        public int getValue ( )
        {
            return temp_ ;
        }        
    }
 
    public static void main (String args [])
    {        
        Inner var1 = new Inner ( ) ;
        System.out.println ( var1.getValue ( ) ) ;
 
        Inner var2 = new Inner ( 999 ) ;
        System.out.println ( var2.getValue ( ) ) ;
 
        System.out.println ( "Helo" ) ;
    }
}

// Temp.java
 
class A    // you can't declare this as public since my filename is "Temp.java"
{
    public static void main ( String[] args )    // won't be called since the main of only the 
    {                                            // public class with name same as file name will
                                                // be called
        System.out.print ( "Hello my friend" ) ;
    }
 
    public class Temp    // inner class can never be the main class
    {                    
        private int temp_ ;
 
        public static void main ( String[] args ) // error !!!
        {
            System.out.print ( "Hello my friend" ) ;
        }
 
        public Temp ( )
        {
            temp_ = 0 ;
        }
 
        public Temp ( int temp )
        {
            temp_ = temp ;
        }
    }
}