java getSource()我做错了什么?
我不知道我做错了什么。我只是制作了一个简单的程序来测试游戏的概念,我试着在点击三个按钮时有三个不同的输出。但是,对于按钮1、按钮2和按钮3,我得到一个错误,它们不能解析为变量。我不知道该怎么办。我做错了什么
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class CodeTestingGround extends JFrame implements ActionListener {
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException
{
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
new CodeTestingGround();
}
public CodeTestingGround() {
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
JFrame frameone = new JFrame();
frameone.setLayout(null);
frameone.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frameone.setLocation(screenSize.width / 3, screenSize.height / 3);
JButton buttonone = new JButton("Click here to download viruses!");
JButton buttontwo = new JButton("Click here to get scammed!");
JButton buttonthree = new JButton("Click here to get hacked!");
buttonone.setBounds(10, 10, 260, 30);
buttontwo.setBounds(10, 50, 260, 30);
buttonthree.setBounds(10, 90, 260, 30);
buttonone.addActionListener(this);
buttontwo.addActionListener(this);
buttonthree.addActionListener(this);
frameone.add(buttonone);
frameone.add(buttontwo);
frameone.add(buttonthree);
frameone.pack();
frameone.setVisible(true);
frameone.setSize(300, 400);
}
public void actionPerformed(ActionEvent event) {
Object control = event.getSource();
if (control == buttonone) { // error right here
JOptionPane.showMessageDialog(null, "Viruses sucessfully downloaded!", "Important Alert", JOptionPane.WARNING_MESSAGE);
}
else if (control == buttontwo) { // error right here
JOptionPane.showMessageDialog(null, "YOU HAVE WON A MILLION DOLLARS!!! Enter you credit card information to claim your prize.", "YOU ARE WIN", JOptionPane.INFORMATION_MESSAGE);
}
else if (control == buttonthree) { // error right here
JOptionPane.showMessageDialog(null, "You have been haxored", "get hacked", JOptionPane.ERROR_MESSAGE);
}
}
}
# 1 楼答案
ActionEvent
和JButton
也支持actionCommand
属性的概念。除非另有规定,ActionEvent#getActionCommand
将返回按钮的文本,您可以使用JButton#setActionCommand
方法更改此内容然后使用
ActionEvent
的actionCommand
属性