设计一个窗口, 窗口中的元素如下: 菜单,其内容模仿记事本的菜单 三个文本框,一个按钮.在前两个文本框中输入两个整数, 点击按钮后把两数之和显示到第三个文本框中.-package cn import java.awt.* import java.awt.event.ActionEvent import java.awt.event.ActionListener import java.awt.event.WindowAdapter import

Java记事本，实现了查找，替换，字体等众多难实现的功能-Java Notepad, to achieve a find, replace, fonts, and many other features difficult to achieve