java Applet程序

来源：百度知道 编辑：UC知道 时间：2024/05/15 23:39:55
编写一个小应用程序。在该Applet中只显示一个按钮，单击该按钮后，弹出一个计算器或者画图程序。
急需!!!

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

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

class JFrameTest extends JFrame {
private static final long serialVersionUID = 1L;
private double d1,d2;
private int tag; //记录当前输入是第几个
private char op;

private JTextField jtf;
private String[] tits={"7","8","9","+","4","5","6","-","1","2","3","*",
"0",".","=","/"};

class opand implements ActionListener{
public void actionPerformed(ActionEvent e) {
//用户按下了运算符号
if (jtf.ge