JAVA参考教程文档（这里）

海边的温彻斯特

JAVA基础语法
JAVA参考教程文档（这里）。

是解释型的语言（.java文件  javac->.class文件  解释器->JVM虚拟机），GO是编译型的，PHP是解释型的。

JAVA变量有枚举类型，PHP8  才开始支持枚举类型。

重载（形参必须不同，方法名称可以一样）与重写（可不变，内部核心变） — 多态性。多态存在的三个必要条件：继承，重写，父类引用指向子类对象：Parent p = ne

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