[英]How can I add the ActionEvent to the JButton so that when i click it it will fire the event?
[英]how to declare JLabels within actionListener(actionEvent e) so that Text can be set when JButton is clicked
我正在編寫一個剪刀石頭布游戲,我試圖讓每個 JLabels 在三個按鈕(Rock、Paper、Scissors)中的一個被點擊時更新。
這樣做的問題是每個 JLabels 都在 createWindow() 中定義,我需要它們也在 ActionListener(ActionEvent e) 中定義。
我試圖從 createWindow() 和 JLabels 更新中復制粘貼一些代碼,但唯一的問題是它創建了一個全新的 window 沒有按鈕(僅包含文本)。 如果我嘗試在主要方法之外實例化標簽,則 JLabels 根本不會出現。
感謝任何幫助(無論我是否必須重新編寫整個程序),我是 Java 和 Swing 的新手,任何批評都會以某種方式有所幫助。 (我在 Eclipse IDE 中寫作)。
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...");
}
}}
解決你的問題的方法很簡單,只需將outcome
class 的panel
, playerchoice
, computerdecision
和RockPaperScissors
成員改為像這樣的局部變量
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!");
...
}
...
}
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