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SOME BACKGROUND ON DESIGN PATTERNS The term “design patterns” sounds a bit formal to the uninitiated and can be somewhat off-putting when you first encounter it. But, in fact, design patterns are just convenient ways of reusing object-oriented code between projects and between programmers. The idea behind design patterns is simple-- write down and catalog common interactions between objects that programmers have frequently found useful.

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绘制各种图表例（饼图柱状图分布图等）。利用JFreeChart类-Draw a variety of charts cases (pie chart histogram distribution maps, etc.). Use JfreeChart category

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Java语 言 的 产 生 及 其 特 点 Java程 序 开 发 与 运 行 环 境 Java程 序 设 计 基 础 Java应 用 程 序 的 基 本 框 架 Java的 类 Java图 形 用 户 接 口 -Java language and its characteristics Java Runtime Environment and Development Based on Java programming Java applications, the basic framework Java class Java graphical user interface

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Java聊天软件chat_src用定制的GUI开发-Java chat software chat_src development with customized GUI