SCJP复习笔记(一)J2SE概要

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JAVA Reresher

1> Class ----类

2> Object ----实例对象

3> State(instance variables)----状态:实例变量

4> behavior (Method) ----行为:方法

 

Identifiers and Keywords

KEY WORD: identifiers(标示符)           legal(语法约束)          keywords(保留字) 

KEY INFO : Java programmers (and Sun) have created conventions for naming methods, variables, and classes.

 

 

Inheritance

KEY INFO : The superclass knows nothing of the classes that inherit from it,

 but all of the subclasses that inherit from the superclass must explicitly declare the inheritance relationship.

but is also free to override superclass methods to define more specific behavior.

 

 

 Interface

KEY INFO : Interfaces are like a 100-percent abstract superclass that defines the methods a subclass must support, but not how they must be supported.

 

Finding Other Classes

KEY INFO : Java organizes classes into packages, and uses import statements to give programmers a consistent way to manage naming of, and access to, classes they need.

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