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打开两个以上的窗口来进行聊天, 即连续运行两次即可. Windows 下可以点击 编译.bat 和 运行.bat 来编译, 运行. 项目代码也可以导入 Eclipse 运行.-Two or more windows open for a chat, that is twice continuous operation. Windows can click on the compiler. Bat and run. Bat to compile, run. Project code can also run into Eclipse.

统计字符数组中字母，数字，符号的出现个数 char[] c = { 2 , c , $ , 4 , 7 , Z , j , ~ , p , c } -Statistics character array of letters, numbers, symbols, the emergence of the number of char [] c = (2, c, $, 4, 7, Z, j, ~, p, c)

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介绍了三种修改现有代码提高其可重用性的方法，它们分别是：改写类的实例方法，把参数类型改成接口，选择最简单的参数接口类型。-Introduce three types of modification of existing reusable code to improve their approach, they are: examples of types of methods adapted to changed interface parameter type, choose the simplest interface type parameters.

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