Question

java图形编程

初学java swing 但网上的例子不太好懂，谁能帮忙举个简单的例子，需要用上listener ，comopent等

Answer 1

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

public class SimpleGUI {

JFrame f = new JFrame("简单的GUI");
JButton b = new JButton("点击我");
static boolean valid = true;

public SimpleGUI() {
f.setBounds(400, 300, 100, 100);
f.setLayout(new BorderLayout());
b.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
if(valid) {
b.setBackground(Color.RED);
} else {
b.setBackground(Color.BLUE);
}
valid = !valid;
}
});
f.add(b, BorderLayout.CENTER);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}

public static void main(String [] args) {
new SimpleGUI();

}
}