Java，

Java，

import java.awt.Color;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

@SuppressWarnings("serial")
public class MyA extends JFrame {
	JButton btnl = new JButton();
	JLabel a = new JLabel();
	public static void main(String[] args) {
		MyA frame = new MyA();
		frame.setVisible(true);
	}
	public MyA() {
		super();
		this.setBounds(100, 100, 500, 500);
		getContentPane().setLayout(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		btnl.setText("检测");
		btnl.setBounds(50, 50, 100, 60);
		btnl.setMargin(new Insets(0,0,0,0));
		btnl.setIcon(new ImageIcon("land.pag"));
		btnl.setRolloverIcon(new ImageIcon("land_over.pag"));
		btnl.setPressedIcon(new ImageIcon("land_pressed.pag"));
		this.getContentPane().add(btnl);
		
		a.setText("哈哈");
		a.setBounds(150, 150, 100, 100);
		this.getContentPane().add(a);
		btnl.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				a.setText("写的啥");
				a.setForeground(Color.red);
			}
		});
		
	}
}