2.1Java数据类型..................................................................................................42.1.1简单数据类型:..........................................................................................4
2.2运算符和表达式..................................................................................................52.2.1主要类型........................................................................................................72.2.2运算符的优先级............................................................................................92.3流程控制............................................................................................................112.3.1概述..............................................................................................................112.3.2控制流语句的类型:..................................................................................113JAVA语言中的面向对象特性..................................................................................123.1类与对象的基本概念........................................................................................123.2面向对象编程的基本特征................................................................................123.3类........................................................................................................................133.4对象....................................................................................................................133.5类成员的修饰符................................................................................................143.6类的继承............................................................................................................143.6.1继承的优点..................................................................................................153.6.2类的继承和实现..........................................................................................153.6.3super.............................................................................................................153.6.4抽象类..........................................................................................................153.6.5final类.........................................................................................................16
3.7接口与包...........................................