Keyword

  class Circle
  {
    private int R;
    private final static double PI=3.14 ;
    PI=3.1407; 
  }
  

  class Circle
  {
    private int R;
    public Circle(int n)
    {
        r=n;
    }
    public void area()
    {
        final double PI=3.14;
        double a=PI*R*R;
        System.out.println("Area is "+a);
        PI=3.1407; 
    }
  }

  class Password
  {
    private String userid,pwd;
    public void setData(String userid,String pwd)
    {
        this.userid=userid ;
        this.pwd=pwd;
    }
    Public final boolean verify(String ud,String pd)
    {
        if(userid.equals(ud)&&pwd.equals(pd))
            return true;
        else
            return false;
    }
  }
  class HackedPassword extends Password
  {
    public boolean verify(String ud,String pd)
    {
        return true;
    }
  }

  final class Password
  {
    private String userid,pwd;
    public void setData(String userid,String pwd)
    {
        this.userid=userid;
        this.pwd=pwd;
    }
    public boolean verify(String ud,String pd)
    {
        if(userid.equals(ud)&&pwd.equals(pd))
            return true;
        else
            return false;
    }
  }
  class HackedPassword extends Password
  {
    public boolean verify(String ud,String pd)
    {
        return true;
    }
  }