第 2 章 Java 编程基础

2.1 语句和表达式............................................ 17

2.2 变量和数据类型........................................ 18

2.2.1 创建变量............................................ 18

2.2.2 给变量命名........................................ 19

2.2.3 变量类型............................................ 19

2.2.4 给变量赋值........................................ 20

2.2.5 常量.................................................... 21

2.3 注释............................................................ 22

2.4 字面量........................................................ 23

2.4.1 数字字面量 ........................................23

2.4.2 布尔字面量 ........................................24

2.4.3 字符字面量 ........................................24

2.4.4 字符串字面量 ....................................25

2.5 表达式和运算符 ........................................26

2.5.1 算术运算符 ........................................26

2.5.2 再谈赋值 ............................................27

2.5.3 递增和递减运算符 ............................28

2.5.4 比较运算符 ........................................29

2.5.5 逻辑运算符 ........................................29

2.5.6 运算符优先级 ....................................30

2.6 字符串运算 ................................................31

2.7 总结............................................................33

2.8 问与答........................................................33

2.9 小测验........................................................33

2.9.1 问题 ....................................................34

2.9.2 答案 ....................................................34

2.10 认证练习 ..................................................34

2.11 练习 ..........................................................34