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趁着假期重看了一遍Java
一.一些曾经不懂的知识点再看有了新的感悟
二.捕捉了一些之前没有注意到的知识
那我就按点来罗列一下好叭~
·1 JDK—开发工具
JRE—运行环境
JVM—JAVA虚拟机
·2 .java(源代码)(编译 javac 文件名.java)—— > .class(字节码文件)(加载 java 文件名)——>JVM
(一个类对应一个字节码文件)
·3 类名:大驼峰(若这个类被public修饰,类名和文件名相同)(一个java文件,只有一个被public修饰的类)
局部变量:小驼峰(必初始化,否则不能编译过)
方法名:小驼峰
·4 数据类型:基本数据类型(8), 引用数据类型(String,类...)
·5 冯诺依曼体系
·6 自动类型转换(隐式)(小->大),强制类型转换(显式),整型提升
·7 idea 查字面值常量是否超出范围,变量 运行的时候才知道
·8 可以对小数求余数
·9 << >> >>>
·10 else与最近的if结合
·11. switch() 参数类型 不能是long,float,double,boolean