23行的一个小程序!请高手帮忙看一下!追分

import javax.swing.*;

public class Class1 extends JFrame {

public Class1() {

JPanel panel=new JPanel();

JButton button = new JButton("生成");

JTextField text = new JTextField(10);

JComboBox cbox = new JComboBox();

panel.add(button);

panel.add(text);

panel.add(cbox);

this.add(panel);

this.setBounds(100,100,200,150);

this.setVisible(true);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public static void main(String[] args) {

Class1 class1 = new Class1();

}

}

我在JPanel上面加了JButton ,JTextField 和JComboBox ,下面请高手帮忙!效果是,在JTextField 里输入一个数字N,点击JButton 后JComboBox 里生成N个数!!比如输入一个数字5,点击按钮后JComboBox 下拉菜单里生成5个数!请高手帮忙改一下代码发上来,谢谢了!解决问题给追20!

//以下是实现的代码：

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Class1 extends JFrame {

private static final long serialVersionUID = 5660386050876539722L;

JPanel panel = new JPanel();

JButton button = new JButton("生成");

JTextField text = new JTextField(10);

JComboBox cbox = new JComboBox();

public Class1() {

panel.add(button);

panel.add(text);

panel.add(cbox);

this.add(panel);

this.setBounds(100, 100, 200, 150);

this.setVisible(true);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void generateItems() {

this.button.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent ae) {

try {

int num = Integer.parseInt(text.getText().trim());

cbox.removeAllItems();

for(int i=0; i<num; i++){

cbox.addItem(""+(i+1));

}

} catch (Exception e) {

JOptionPane.showMessageDialog(null, "请输入一个整数!", "输入错误", JOptionPane.INFORMATION_MESSAGE);

}

}

});

}

public static void main(String[] args) {

Class1 class1 = new Class1();

class1.generateItems();

}

}