i need help finish this program for an assignment, It should play the Rock, Paper, Scissors game. The nextPlay methoded needs to be filled in with nested switches.

thanks for your help

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Rps extends JFrame
    implements ActionListener
{
  private final char moves[] = {'R', 'P', 'S'};
  private JRadioButton rock, paper, scissors;
  private JTextField display;

  public Rps()
  {
    super("Rock, paper, Scissors");

    rock = new JRadioButton("   Rock   ", true);
    paper = new JRadioButton("   Paper  ");
    scissors = new JRadioButton(" Scissors ");

    ButtonGroup rpsButtons = new ButtonGroup();
    rpsButtons.add(rock);
    rpsButtons.add(paper);
    rpsButtons.add(scissors);

    JButton go = new JButton("         Go         ");
    go.addActionListener(this);

    display = new JTextField(25);
    display.setEditable(false);
    display.setBackground(Color.yellow);

    Container c = getContentPane();
    c.setLayout(new FlowLayout());
    c.add(rock);
    c.add(paper);
    c.add(scissors);
    c.add(go);
    c.add(display);
  }

  /**
   *  returns -1 if the player wins,
   *  0 if it's a tie, and 1 if the computer wins
   */
  private int nextPlay(char computerMove, char playerMove)
  {

  }

  public void actionPerformed(ActionEvent e)
  {
    char playerMove, computerMove;
    if (rock.isSelected())
      playerMove = 'R';
    else if (paper.isSelected())
      playerMove = 'P';
    else // if (scissors.isSelected())
      playerMove = 'S';

    int k = (int)(Math.random() * 3);
    computerMove = moves[k];
    int result = nextPlay(computerMove, playerMove);

    String msg = "  You said " + makeWord(playerMove) + ", I said " +
                 makeWord(computerMove);
    if (result < 0)
      msg += " -- you win.";
    else if (result == 0)
      msg += " -- tie.";
    else // if (result > 0)
      msg += " -- I win.";
    display.setText(msg); 
  }

  private String makeWord(char move)
  {
    String word = "";

    switch (move)
    {
      case 'R': word = "ROCK"; break;
      case 'P': word = "PAPER"; break;
      case 'S': word = "SCISSORS"; break;
    }
    return word;
  }

  public static void main(String[] args)
  {
    Rps window = new Rps();
    window.setBounds(300, 300, 300, 140);
    window.setDefaultCloseOperation(EXIT_ON_CLOSE);
    window.setVisible(true);
  }
}

i hope following code might be working for getting true output.

if(computerMove==playerMove)
    {
    return 0;
    }
    else if(computerMove>playerMove)
    {
    return 1;
    }
    else
    {
    return -1;
    }

put above thing inside nextPlay method and see the output.
please let me know if this is correct or not.

Thanks.

Comments
Spoonfeeds answer, no attempt to teach

you should try to stear into the direction that he can find it himself.
if you do, however, want to show him something like that, why not just saying:

if ( computerMove == playerMove )
  return 0;
if ( computerMove > playerMove )
  return 1;
return -1;

less code with the same result.

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