我不知道我在这里做错了什么。只是制作一个简单的程序来测试游戏的概念,我试图让三个按钮在单击时具有三个不同的输出。但是,对于按钮一、二和三,我收到一条错误消息,指出它们无法解析为变量。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);
}
}
}
最佳答案
ActionEvent
和 JButton
还支持 actionCommand
属性的概念。除非另有指定,ActionEvent#getActionCommand
将返回按钮的文本,您可以使用 JButton#setActionCommand
方法更改此设置
JButton buttonone = new JButton("Click here to download viruses!");
buttonone.setActionCommand("bad");
JButton buttontwo = new JButton("Click here to get scammed!");
buttonone.setActionCommand("ugly");
JButton buttonthree = new JButton("Click here to get hacked!");
buttonone.setActionCommand("hacked");
然后您将使用 ActionEvent
的 actionCommand
属性...
public void actionPerformed(ActionEvent event) {
String cmd = event.getActionCommand();
if ("bad".equals(cmd)) { // error right here
JOptionPane.showMessageDialog(null, "Viruses sucessfully downloaded!", "Important Alert", JOptionPane.WARNING_MESSAGE);
}
else if ("ugly".equals(cmd)) { // 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 ("hacked".equals(cmd)) { // error right here
JOptionPane.showMessageDialog(null, "You have been haxored", "get hacked", JOptionPane.ERROR_MESSAGE);
}
}
关于java - getSource() - 我在这里做错了什么?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33988244/