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java - 如何在actionListener(actionEvent e)中声明JLabels,以便在单击JButton时可以设置文本

转载 作者:行者123 更新时间:2023-12-01 16:14:58 25 4
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我正在编写一个石头剪刀布游戏,并且尝试在单击三个按钮(石头、剪刀、布)之一时更新每个 JLabel。

问题是每个 JLabel 都是在 createWindow() 中定义的,我需要它们也在 ActionListener(ActionEvent e) 中定义。

我尝试复制粘贴 createWindow() 和 JLabels 更新中的一些代码,但唯一的问题是它创建了一个没有按钮的全新窗口(仅包含文本)。如果我尝试在主方法之外实例化标签,则 JLabels 根本不会显示。

任何帮助都会受到赞赏(无论我是否必须重写整个程序),我是 Java 和 Swing 的新手,任何批评都会以某种方式有所帮助。 (我正在 Eclipse IDE 中编写)。

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

public class RockPaperScissors extends JPanel implements ActionListener {
public static void main(String[] args) {
RockPaperScissors sm = new RockPaperScissors();
sm.createWindow();
}
private void createWindow() {
// create JFrame/JPanel
JFrame frame = new JFrame("Rock! Paper! Scissors!");
JPanel panel = new JPanel();
JLabel title = new JLabel("Rock! Paper! Scissors!");
JLabel playerchoice = new JLabel("");
JLabel computerdecision = new JLabel("");
JLabel outcome = new JLabel("");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.pack();
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
JButton button1 = new JButton("Rock");
panel.add(button1);
button1.addActionListener(this);
button1.setBounds(480, 500, 100, 50);
JButton button2 = new JButton("Paper");
panel.add(button2);
button2.addActionListener(this);
button2.setBounds(590, 500, 100, 50);
JButton button3 = new JButton("Scissors");
panel.add(button3);
button3.addActionListener(this);
button3.setBounds(700, 500, 100, 50);
frame.add(panel);
panel.setLayout(new BorderLayout());
GroupLayout layout = new GroupLayout(this);
this.setLayout(layout);
panel.add(title);
panel.add(playerchoice);
panel.add(computerdecision);
panel.add(outcome);
outcome.setBounds(571, 90, 260, 200);
computerdecision.setBounds(571, 100, 260, 200);
playerchoice.setBounds(571, 120, 260, 200);
title.setBounds(571, 0, 260, 200);
}
public void actionPerformed(ActionEvent e) {
// JLabels
int choice = 0;
int computerchoice = 0;
int min = -1;
int max = -3;
computerchoice = (int) (Math.random() * (max - min - 1) + min);
if (computerchoice == -1) {
panel.add(computerdecision);
computerdecision.setText("The Computer Chose Rock!");
// for checking
System.out.println("The Computer Chose Rock!");
} else if (computerchoice == -2) {
panel.add(computerdecision);
computerdecision.setText("The Computer Chose Paper!");
// for checking
System.out.println("The Computer Chose Paper!");
} else if (computerchoice == -3) {
panel.add(computerdecision);
computerdecision.setText("The Computer Chose Scissors!");
// for checking
System.out.println("The Computer chose Scissors!");
}
if (e.getActionCommand().equals("Rock")) {
choice = 1;
panel.add(playerchoice);
playerchoice.setText("You chose Rock!");
// for checking
System.out.println("You chose Rock!");
} else if (e.getActionCommand().equals("Paper")) {
choice = 2;
panel.add(playerchoice);
playerchoice.setText("You chose Paper!");
// for checking
System.out.println("You chose Paper!");
} else if (e.getActionCommand().equals("Scissors")) {
choice = 3;
panel.add(playerchoice);
playerchoice.setText("You chose Scissors!");
// for checking
System.out.println("You chose Scissors!");
}
if (choice + computerchoice == 0) {
panel.add(outcome);
outcome.setText("It is a Tie!");
// for checking
System.out.println("It is a Tie!");
} else if (choice + computerchoice == 1 || choice + computerchoice == -2) {
panel.add(outcome);
outcome.setText("You Win!");
// for checking
System.out.println("You Win!");
} else if (choice + computerchoice == 2 || choice + computerchoice == -1) {
panel.add(outcome);
outcome.setText("You Lose...");
// for checking
System.out.println("You Lose...");
}
}}

最佳答案

解决你的问题很简单,只需制作面板playerchoicecomputerdecisionoutcome RockPaperScissors 类的成员,而不是像这样的局部变量

public class RockPaperScissors extends JPanel implements ActionListener {
private JPanel panel;
private JLabel computerdecision;
private JLabel playerchoice;
private JLabel outcome;

...

private void createWindow() {
JFrame frame = new JFrame("Rock! Paper! Scissors!");
panel = new JPanel();
playerchoice = new JLabel("");
computerdecision = new JLabel("");
outcome = new JLabel("");
JLabel title = new JLabel("Rock! Paper! Scissors!");
...
}
...
}

关于java - 如何在actionListener(actionEvent e)中声明JLabels,以便在单击JButton时可以设置文本,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/62424917/

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