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Java基础——HelloWorld2

HelloWorld-2一、java开发环境配置1，JRE和JDKJVM+解释器=JRE(JAVA运行环境)编译器+JRE+工具+类库=JDK（JAVA开发工具包）2，下载方式及环境变量的配置教程如下http://jingyan.baidu.com/article/48b558e32d92b4...

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Java基础——HelloWorld1

Java语言历史1，什么是程序设计语言？程序设计语言用于书写计算机程序的语言。语言的基础是一组记号和一组规则。根据规则由记号构成的记号串的总体就是语言。在程序设计语言中，这些记号串就是程序。程序设计语言有3个方面的因素，即语法、语义和语用。语法表示程序的结构或形式，亦即表示构成语言的各个记号之间的组...

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