目录
1. java 基础语法...............................................................................................................................3
1.1 注释 ...................................................................................................................................3
1.2 关键字 ...............................................................................................................................4
1.3 常量 ...................................................................................................................................4
1.4 数据类型 ...........................................................................................................................4
1.5 变量 ...................................................................................................................................5
1.6 标识符 ...............................................................................................................................5
1.7 类型转换 ...........................................................................................................................5
1.8 算术运算符 ........................................................................................................................6
1.9 数据输入 ..........................................................................................................................8
2.0 流程控制语句 ............................................................................................................................8
2.0 If 语句格式 .........................................................................................................................9
(1) If(关系表达式){.............................................................................................................9
(2) If(关系表达式){ .....................................................................................................9
(3)if(关系表达式){ .........................................................................................................9
2.1Switch 语句格式..................................................................................................................9
2.2 for 循环语句格式...............................................................................................................9
2.3while 循环..........................................................................................................................13
2.4do while 循环语句.............................................................................................................14
2.5 三种循环的区别 ..............................................................................................................15
2.6Random 的作用和使用步骤 .............................................................................................15
3.0 数组 ..........................................................................................................................................16
3.1 数组 ..................................................................................................................................16
3.2 内存分配 ..........................................................................................................................16
4.0 方法 ..........................................................................................................................................17
4.5 方法重载 ..........................................................................................................................18
5.0 面向对象 ..................................................................................................................................19
5.1 封装 ..................................................................................................................................20
5.1.2 构造方法 .......................................................................................................................21
5.2 继承 ..................................................................................................................................22
5.3 方法重写 ..........................................................................................................................23
5.4 修饰符 ..............................................................................................................................23
5.5 多态 ..................................................................................................................................24
5.6 抽象类 ..............................................................................................................................25
5.7 接口 ..................................................................................................................................25
5.8 内部类 ..............................................................................................................................25
5.9 常用 API ............................................................................................................................26
6.0String 类.....................................................................................................................................27
2.2equals 方法的作用............................................................................................................28
2.3String 类的构造方法【记忆】 .........................................................................................29
2.5 字符串的比较【理解】...................................................................................................29
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