声明:
1)仅作为个人学习,如有冒犯,告知速删!
2)不想误导,如有错误,不吝指教!
数据类型 | 关键字 | 内存占用 | 取值范围 |
---|---|---|---|
整数类型 | byte | 1 | -128~127 |
short | 2 | -32768~32767 | |
int(默认) | 4 | -2的31次方到2的31次方-1 | |
long | 8 | -2的63次方到2的63次方-1 | |
浮点类型 | float | 4 | 负数:-3.402823E+38到-1.401298E-45 正数: 1.401298E-45到3.402823E+38 |
double(默认) | 8 | 负数:-1.797693E+308到-4.9000000E-324 正数:4.9000000E-324 到1.797693E+308 | |
字符类型 | char | 2 | 0-65535 |
布尔类型 | boolean | 1 | true,false |
标识符是用户编程时使用的名字,用于给类、方法、变量、常量等命名。
Java中标识符的组成规则:
Java中标识符的命名约定:
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day2/demo/Relationship.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day2/demo/countSum.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day2/demo/inputDate.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day2/demo/Process_control.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day3/switchCycle.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day3/forCycle.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day3/whileCycle.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day3/random.java
代码链接:https://github.com/xbhog/JavaBasis/blob/master/JavaStudy/src/day4/array.java
Github:https://github.com/xbhog/JavaBasis
致谢:如果对您有帮助,希望随手一个star,感谢!!