java 创建普通窗口

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.swing.JFrame;

public class main{

public static void main(String[] args){//主类
ExecutorService ES = Executors.newFixedThreadPool(1);//开启线程池 最多线程数为1
ES.execute(new Windows_Thread());//向线程池添加运行线程（）

}

}
class Windows_Thread implements Runnable{
@Override
public void run(){
JFrame Window_Frist=new JFrame();
Window_Frist.setSize(500,800);
Window_Frist.setTitle("First Window");
Window_Frist.setVisible(true);//显示
Window_Frist.addWindowListener(new WindowAdapter(){
@Override
public void windowClosing(WindowEvent e) {
Window_Frist.setVisible(false);//关闭显示（之所以不先关闭线程是为了让用户对程序有好感）