求助一条java编程

来源：百度知道 编辑：UC知道 时间：2024/05/27 16:42:47
求助编定一个,可以自已输任意一个数,然后有一个按钮"求平方"并求出值的小程序...

//JDK_JRE 1.6 OR LATER

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class UI extends JFrame {

private JButton okBtn = new JButton("运算");

private JTextField inputEdit = new JTextField();

private JLabel label = new JLabel("结果:");

public UI() {
addComponents();

this.setResizable(false);
this.setTitle("TT");
this.setSize(400, 200);
this.setLocation(300, 300);
this.setVisible(true);

okBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub

String str = inputEdit.getText();

if (str.equals("")) return ;