給主頁面添加標題和按鈕

package com; import javax.swing.*; public class day1 extends JFrame !](https://img-blog.csdnimg.cn/20200616112040496.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6L

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