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java

一、java程序开发

  • 创建、编辑java源文件，后缀名为.java
  • 使用java编译器来编译java源文件生成字节码文件，后缀名为.class
  • 使用java虚拟机来执行生成的字节码文件，完成java程序要实现的功能

今天上课老师提出了一个问题：为什么java是跨平台的语言？

  1. 因为java平台是由java虚拟机和java应用编程接口构成，且java程序的跨平台主要指的是字节码文件可以在任何具有java虚拟机的电子设备上运行
  2. java语言是完全统一的版本
  3. 由编译器产生的字节码是与平台无关的
  4. java虚拟机隐藏了不同平台的差异，保证了字节码文件运行的正确性 （附上我的一张思维脑图，上面有java概念和部分java的数据类型，可以帮助理解,这张图我直接放在这个目录下）

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