读着没有发现问题，可是编译不了，不知道哪错了，求解。

[sunwxb]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JOptionPanelDemo implements ActionListener {
	JFrame frame=new JFrame("JOptionPane Demo");
	JTextField tf=new JTextField();
	JButton messageButton,ConfirmButton,InputButton,OptionButton;
	
	public static void main(String args[]){
		JOptionPanelDemo opd=new JOptionPanelDemo();
		opd.go();
		
	}
	public void go() {
		messageButton=new JButton("Message Dialog");
		messageButton.addActionListener(this);
		ConfirmButton=new JButton("ConfirmButton Dialog");
		ConfirmButton.addActionListener(this);
		InputButton=new JButton("InputButton Dialog");
		InputButton.addActionListener(this);
		OptionButton=new JButton("OptionButton Dialog");
		OptionButton.addActionListener(this);
		
		JPanel jp=new JPanel();
		jp.add(messageButton);
		jp.add(ConfirmButton);
		jp.add(InputButton);
		jp.add(OptionButton);
		
		Container cp=frame.getContentPane();
		cp.add(jp,BorderLayout.CENTER);
		cp.add(tf,BorderLayout.SOUTH);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}
	public void actionPerformed(ActionEvent e) {
	JButton button=(JButton)e.getSource();
	//信息对话框
	if(button==messageButton) {
		JOptionPane.showMessageDialog(frame,"Field not found.","An error",JOptionPane.ERROR_MESSAGE);
	}
	//确认对话框
	if(button==ConfirmButton) {
		int select=JOptionPane.showConfirmDialog(frame,"Create one","Confirm",JOptionPane.YES_NO_OPTION);
		if(select==JOptionPane.YES_OPTION) {
			tf.setText("Choose YES");
		if(select==JOptionPane.NO_OPTION) {
			tf.setText("Choose NO");
		if(select==JOptionPane.CLOSED_OPTION) {
			tf.setText("Choose CLOSE");
	}
		//输入对话框
	if(button==InputButton) {
		Object[] possibleValues={"First","Second","Third"};
		Object selectedValue=JOptionPane.showInputDialog(frame,
			"Choose one","Input",JOptionPane.INFORMATION_MESSAGE,null,
			possibleValues,possibleValues[0]);
	if(selectedValue!=null)
		tf.setText(selectedValue.toString());
	else
		tf.setText("Closed");
	
	}
	//选项对话框
	if(button==OptionButton) {
		Object[]options={"OK","CANCEL"};
		int select1=JOptionPane.showOptionDialog(frame,"Click OK to continue",
				"Warning",JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,
				null,options,options[0]);
		if(select1==0) 
			tf.setText("choose OK");
		else if(select1==1)
			tf.setText("choose CANCEL");
		else if(select1==-1)
			tf.setText("Closed");
			
		}
	}
}

[swandragon]

少了3个}
if(select==JOptionPane.YES_OPTION) {
tf.setText("Choose YES");
}
if(select==JOptionPane.NO_OPTION) {
tf.setText("Choose NO");
}
if(select==JOptionPane.CLOSED_OPTION) {
tf.setText("Choose CLOSE");
}

[justinavril]

哈哈哈 有写轮眼果然不一样

[hardycheng]

大括号不对应。



你把代码放到Eclipse里面就能很明显的看到格式或者简单逻辑哪儿有错误了。

[yanenyi1987]

大哥 小弟非常佩服你写的代码 都是写什么啊 我要是你的项目经理肯定把你丢了！！！
括号全错了！你那IF语句里面虽然只有一句语句 希望以后你也能加上括号！！！
正确的代码如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JOptionPanelDemo implements ActionListener {
JFrame frame=new JFrame("JOptionPane Demo");
JTextField tf=new JTextField();
JButton messageButton,ConfirmButton,InputButton,OptionButton;

public static void main(String[] args){
JOptionPanelDemo opd=new JOptionPanelDemo();
opd.go();
}

public void actionPerformed(ActionEvent e) {
JButton button=(JButton)e.getSource();
//信息对话框
if(button==messageButton) {
JOptionPane.showMessageDialog(frame,"Field not found.","An error",JOptionPane.ERROR_MESSAGE);
}
//确认对话框
if(button==ConfirmButton) {
int select=JOptionPane.showConfirmDialog(frame,"Create one","Confirm",JOptionPane.YES_NO_OPTION);
if(select==JOptionPane.YES_OPTION)
tf.setText("Choose YES");
if(select==JOptionPane.NO_OPTION)
tf.setText("Choose NO");
if(select==JOptionPane.CLOSED_OPTION)
tf.setText("Choose CLOSE");
}
//输入对话框
if(button==InputButton) {
Object[] possibleValues={"First","Second","Third"};
Object selectedValue=JOptionPane.showInputDialog(frame,
"Choose one","Input",JOptionPane.INFORMATION_MESSAGE,null,
possibleValues,possibleValues[0]);
if(selectedValue!=null){
tf.setText(selectedValue.toString());
}else{
tf.setText("Closed");
}
}
//选项对话框
if(button==OptionButton) {
Object[]options={"OK","CANCEL"};
int select1=JOptionPane.showOptionDialog(frame,"Click OK to continue",
"Warning",JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,
null,options,options[0]);
if(select1==0) {
tf.setText("choose OK");
}else if(select1==1){
tf.setText("choose CANCEL");
} else if(select1==-1){
tf.setText("Closed");
}
}
}


public void go() {
messageButton=new JButton("Message Dialog");
messageButton.addActionListener(this);
ConfirmButton=new JButton("ConfirmButton Dialog");
ConfirmButton.addActionListener(this);
InputButton=new JButton("InputButton Dialog");
InputButton.addActionListener(this);
OptionButton=new JButton("OptionButton Dialog");
OptionButton.addActionListener(this);

JPanel jp=new JPanel();
jp.add(messageButton);
jp.add(ConfirmButton);
jp.add(InputButton);
jp.add(OptionButton);

Container cp=frame.getContentPane();
cp.add(jp,BorderLayout.CENTER);
cp.add(tf,BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}

[zl3450341]

if(button==ConfirmButton) {
        int select=JOptionPane.showConfirmDialog(frame,"Create one","Confirm",JOptionPane.YES_NO_OPTION);
        if(select==JOptionPane.YES_OPTION) {
            tf.setText("Choose YES");
        if(select==JOptionPane.NO_OPTION) {
            tf.setText("Choose NO");
        if(select==JOptionPane.CLOSED_OPTION) {
            tf.setText("Choose CLOSE");
    }

少了}

1楼眼神真好啊