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你好 stackoverflow 社区，我正在尝试向这个 gui 应用程序添加一个 nuke 功能。但是，我的 IDE 抱怨 super 语句，它还抱怨找不到符号 msg。在我添加 nuke 功能之前，这是完美的。我可以添加什么来让它工作？

import java.util.concurrent.TimeUnit;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

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

public void Rps()
{
super("Rock, Paper, Scissors, Nuke");

rock = new JRadioButton("   Rock   ", true);
paper = new JRadioButton("   Paper  ");
scissors = new JRadioButton(" Scissors ");
nuke = new JRadioButton(" Nuke ");
ButtonGroup rpsButtons = new ButtonGroup();
rpsButtons.add(rock);
rpsButtons.add(paper);
rpsButtons.add(scissors);
rpsButtons.add(nuke);

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(nuke);
c.add(display);
if (nuke.isSelected()){
display.setText("Don't do it man");}
else {
display.setText("");}
}

/**
 *  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)
{
if ((computerMove == 'R'&&playerMove == 'S')||(computerMove == 'S'&&playerMove=='P')||(computerMove=='P'&&playerMove=='R')){
 return 1;}
else if ((computerMove == 'R'&&playerMove == 'R')||(computerMove=='S'&&playerMove=='S')||(computerMove=='P'&&playerMove=='P')){
 return 0;}
else if (playerMove == 'N'){
 return 2;}
return -1;  

}

public void actionPerformed(ActionEvent e)
{
 char playerMove, computerMove;
 playerMove = 0;
 if (rock.isSelected()){
   playerMove = 'R';}
 else if (paper.isSelected()){
   playerMove = 'P';}
else if (scissors.isSelected()){
  playerMove = 'S';}
else if (nuke.isSelected()){
  playerMove = 'N';}
int k = (int)(Math.random() * 3);
computerMove = moves[k];
int result = nextPlay(computerMove, playerMove);

if (result != 2)
{String msg = "  You said " + makeWord(playerMove) + ", I said " +
             makeWord(computerMove);
}
else if (result == 2)
{String msg = "It's too late, we're all dead!";
 TimeUnit.SECONDS.sleep(1);
 msg = "...";
 TimeUnit.SECONDS.sleep(1);
 msg = "Look at what you did, there's nothing left.";
 TimeUnit.SECONDS.sleep(1);
 msg = "Looks like we have to start over again...";
 main(null);                        
}             
else 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;
  case 'N': word = "nuke"; 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);
}
}
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2 回答 2

3

构造函数不使用void关键字。这仅适用于方法。还将构造函数名称与声明的类型匹配

public RpsNuke() {
    super("Rock, Paper, Scissors, Nuke");
    ...
}

您看到变量错误的原因msg是它们在所有if语句块的范围内都不可见。要解决这个问题，您需要创建一个，String而不是在构建一个零碎时通过附加到它。也不要TimeUnit.SECONDS.sleep在 Swing 中使用，这只会阻止EDT更新应用程序。改用摆动计时器。

于 2013-09-26T13:30:19.363 回答
3

删除关键字void，因为这意味着您正在调用与您的类同名的方法。相反，您正在调用构造函数；不是方法。

public void RpsNuke() { ... }

至

public RpsNuke() { ... }
于 2013-09-26T13:33:10.283 回答