java中swing的简单用法，做一个小界面

package zzn;
import javax.swing.*;
public class demoui extends JFrame {

    public static void main(String[] args) {
                demoui ui=new demoui();

    }
    public demoui()
    {
        this.setVisible(true);
        this.setSize(500,500);
    }

}

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