JAVA程序改错

来源：百度知道 编辑：UC知道 时间：2024/05/21 09:31:14
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class r extends Applet implements ActionListener
{
TextField text;
Button buttonEnter,buttonQuit;
public void init(){
{
text=new TextField("0",10);add(text);
buttonEnter=new Button("确定");buttonQuit=new Button("清除");
add(buttonEnter);add(buttonQuit);
buttonEnter.addActionListener(this);
buttonQuit.addActionListener(this);
text.addActionListener(this);
}
public void paint(Graphics g)
{g.drawString("在文本框输入数字字符回车或单击按钮",10,100);
g.drawString("第文本框显示该数的平方根",10,120);
}
public void actionPerformed(ActionEvent e)
{if(e.getSource()==buttonEnter||e.getSource()==text)
{double number=0;
try{number=Double.valueOf(text.getText()).doubleValue();
text.setText(""+Math.sqrt(number));
}<

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class r extends Applet implements ActionListener {
TextField text;

Button buttonEnter, buttonQuit;

public void init(){
text=new TextField("0",10);add(text);
buttonEnter=new Button("确定");buttonQuit=new Button("清除");
add(buttonEnter);add(buttonQuit);
buttonEnter.addActionListener(this);
buttonQuit.addActionListener(this);
text.addActionListener(this);
}

public void paint(Graphics g) {
g.drawString("在文本框输入数字字符回车或单击按钮", 10, 100);
g.drawString("第文本框显示该数的平方根", 10, 120);
}

public void actionPerformed(ActionEvent e) {
if (e.getSource() == buttonEnter || e.getSource() == text) {
double number = 0;
try {
number = Double.valueOf(text.getText()).doubleValue();
text.setText(&quo