运行程序无反应？不知问题出在那了？帮忙看一下

Question

package cn.ts.jfilechooser;import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.util.Scanner;import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Demo {
public static void main(String args[]){

new Note();
}
}
class Note implements ActionListener {
   private JTextArea area=new JTextArea(8,10);
   private JFrame frame=new JFrame("文件选择");  
   private JButton open=new JButton("打开文件");
   private JButton save=new JButton("存储文件");
   private JLabel lab=new JLabel("现在没有打开文件");
   private JPanel pan=new JPanel();
   public void Note(){
   this.pan.add(open);
   this.pan.add(save);
   frame.setLayout(new BorderLayout(3,3));
   frame.add(this.lab);
   frame.add(this.pan);
   frame.add(new JScrollPane(this.area),BorderLayout.CENTER);
   this.frame.setSize(330,180);
   this.frame.setVisible(true);
   this.frame.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
   System.exit(1);
   }
   });
   this.open.addActionListener(this);
   this.save.addActionListener(this);
   frame.setSize(300,200);
   frame.setVisible(true);
   
   }
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
        File file=null;
        int result=0;
        JFileChooser fileChooser=new JFileChooser();
        if(arg0.getSource()==this.open){
         this.area.setText("");
         fileChooser.setApproveButtonText("确定");
         fileChooser.setDialogTitle("打开文件");
         result=fileChooser.showOpenDialog(this.frame);
         if(result==JFileChooser.APPROVE_OPTION){
         file=fileChooser.getSelectedFile();
         this.lab.setText("打开的文件名称"+file.getName());
         }else if(result==JFileChooser.CANCEL_OPTION){
         this.lab.setText("没有选择文件");
         }else{
         this.lab.setText("操作有误");
         }
         if(file!=null){
         try{
         Scanner scan=new Scanner(new FileInputStream(file));
         scan.useDelimiter("\n");
         while(scan.hasNext()){
         this.area.append(scan.next());
         this.area.append("\n");
         }
         scan.close();
         }catch(Exception e){
         this.lab.setText("读文件出错");
         }
         }
        }
       
}
}

Answer 1

 public static void main(String args[]){
    
        new Note();
    }
我怎么没看到你从哪里执行方法了
public void Note(){
如果没void它是构造方法的 那么Note执行
没懂意思 哪里copy的代码

Answer 2

package cn.ts.jfilechooser;import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.Scanner;import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class Demo {
public static void main(String args[]){

new Note();
}
}
class Note implements ActionListener {
   private JTextArea area=new JTextArea(8,10);
   private JFrame frame=new JFrame("文件选择");  
   private JButton open=new JButton("打开文件");
   private JButton save=new JButton("存储文件");
   private JLabel lab=new JLabel("现在没有打开文件");
   private JPanel pan=new JPanel();
   public  Note(){
   this.pan.add(open);
   this.pan.add(save);
   frame.setLayout(new BorderLayout(3,3));
   frame.add(this.lab);
   frame.add(this.pan);
   frame.add(new JScrollPane(this.area),BorderLayout.CENTER);
   this.frame.setSize(330,180);
   this.frame.setVisible(true);
   this.frame.addWindowListener(new WindowAdapter(){
   public void windowClosing(WindowEvent e){
   System.exit(1);
   }
   });
   this.open.addActionListener(this);
   this.save.addActionListener(this);
   frame.setSize(300,200);
  frame.setVisible(true);
   
   }
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
        File file=null;
        int result=0;
        JFileChooser fileChooser=new JFileChooser();
        if(arg0.getSource()==this.open){
         this.area.setText("");
         fileChooser.setApproveButtonText("确定");
         fileChooser.setDialogTitle("打开文件");
         result=fileChooser.showOpenDialog(this.frame);
         if(result==JFileChooser.APPROVE_OPTION){
         file=fileChooser.getSelectedFile();
         this.lab.setText("打开的文件名称"+file.getName());
         }else if(result==JFileChooser.CANCEL_OPTION){
         this.lab.setText("没有选择文件");
         }else{
         this.lab.setText("操作有误");
         }
         if(file!=null){
         try{
         Scanner scan=new Scanner(new FileInputStream(file));
         scan.useDelimiter("\n");
         while(scan.hasNext()){
         this.area.append(scan.next());
         this.area.append("\n");
         }
         scan.close();
         }catch(Exception e){
         this.lab.setText("读文件出错");
         }
         }
        }
       if(arg0.getSource()==this.save){
        result=fileChooser.showSaveDialog(this.frame);
        if(result==JFileChooser.APPROVE_OPTION){
        file=fileChooser.getSelectedFile();
        this.lab.setText("选择存储的文件名为"+file.getName());
        }else if(result==JFileChooser.CANCEL_OPTION){
        this.lab.setText("没有选择任何文件");
        }else{
        this.lab.setText("操作有误");
        }
        if(file!=null){
        try {
PrintStream out=new PrintStream(new FileOutputStream(file));
out.print(this.area.getText());
out.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
this.lab.setText(" 文件保存失败");
}
        }
       }
}
}