怎么在一个按钮上加一个监听，实现随机数的产生？java

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class TestRandom extends JFrame {
JTextField field;
JButton randomButton;
RandomNumber t = new RandomNumber();
public TestRandom() {
field = new JTextField(15);
randomButton = new JButton("产生随机数");
randomButton.addActionListener(new RandomListener());
this.getContentPane().setLayout(new FlowLayout());
this.getContentPane().add(field);
this.getContentPane().add(randomButton);

this.setSize(300,100);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});