Java修改全文数字,求大神帮我修改下java计算机代码，数字键只有0和8能用

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package rj0211;

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.TextField;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Calculator {

JFrame frame;// 新建窗体对象

JButton buttonzero, buttondot, buttonequal;

JButton buttonplus, buttonminus, buttonmultiple, buttondevision, buttonsin,

buttontozero, JButton;

JButton buttonone, buttontwo, buttonthree,buttonfour, buttonfive,

buttonsix, buttonseven, buttoneight,buttonnine;

JPanel panelwest, panelcenter, paneleast;

TextField tf;

public Calculator() {

tf = new TextField();

// 构造空文本字段

frame = new JFrame("java计算机");

panelcenter = new JPanel();

panelwest = new JPanel();

paneleast = new JPanel();

Handle h = new Handle();

//创建数字按钮对象

buttonone = new JButton("1");

buttontwo = new JButton("2");

buttonthree = new JButton("3");

buttonfour = new JButton("4");

buttonfive = new JButton("5");

buttonsix = new JButton("6");

buttonseven = new JButton("7");

buttoneight = new JButton("8");

buttondot = new JButton("9");

panelcenter.setLayout(new GridLayout(3, 3));

panelcenter.add(buttonone);

panelcenter.add(buttontwo);

panelcenter.add(buttonthree);

panelcenter.add(buttonfour);

panelcenter.add(buttonfive);

panelcenter.add(buttonsix);

panelcenter.add(buttonseven);

panelcenter.add(buttoneight);

panelcenter.add(buttondot);

buttonone.addActionListener(h);

buttontwo.addActionListener(h);

buttonthree.addActionListener(h);

buttonfour.addActionListener(h);

buttonfive.addActionListener(h);

buttonsix.addActionListener(h);

buttonseven.addActionListener(h);

buttoneight.addActionListener(h);

buttondot.addActionListener(h);

// 构造按钮

buttonzero = new JButton("0");

buttondot = new JButton(".");

buttonequal = new JButton("=");

buttonzero.addActionListener(h);

buttondot.addActionListener(h);

buttonequal.addActionListener(h);

panelwest.setLayout(new GridLayout(3, 1));

panelwest.add(buttonzero);

panelwest.add(buttondot);

panelwest.add(buttonequal);

buttonplus = new JButton("+");

buttonminus = new JButton("-");

buttonmultiple = new JButton("*");

buttondevision = new JButton("/");

buttonsin = new JButton("sin");

buttontozero = new JButton("清除");

paneleast.setLayout(new GridLayout(3, 1));

paneleast.add(buttonplus);

paneleast.add(buttonminus);

paneleast.add(buttonmultiple);

paneleast.add(buttondevision);

paneleast.add(buttonsin);

paneleast.add(buttontozero);

buttonplus.addActionListener(h);

buttonminus.addActionListener(h);

buttonmultiple.addActionListener(h);

buttondevision.addActionListener(h);

buttonsin.addActionListener(h);

buttontozero.addActionListener(h);

tf.setSize(300,50);

frame.setLayout(new BorderLayout());// 设置窗体为边界布局

frame.add(paneleast, "East");

frame.add(tf, BorderLayout.NORTH);

frame.add(panelwest,BorderLayout.WEST);

frame.add(panelcenter, BorderLayout.CENTER);

frame.pack();

frame.setBounds(100, 100, 300, 200);// 设置窗体

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);// 设置窗体可见

}

public static void main(String[] args) {

new Calculator();

}

class Handle implements ActionListener {

int biaozhi = 0;

double flag1 = 0, flag2 = 0, flag3 = 0;

public void actionPerformed(ActionEvent e) {

try {

if (e.getSource() == buttondot) {

tf.setText("0.");

}

if (e.getSource() == buttontozero) {

tf.setText("");

}

if (e.getSource() == buttonzero) {

tf.setText(tf.getText() + "0");