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作者:外围滚球app_外围买球足球网站更新时间:2020-10-31 21:30:27

     dentity---与其他相似行为对象的区分标志     每个对象有唯一的indentity而这3者之间相互影响皇冠APP下载_皇冠APP官网下载     6.类之间的关系:     use-a:依赖关系     has-a:聚合关系

     is-a:继承关系--例:A类继承了B类,此时A类不仅有了B类的方法,还有其自己的方法.(个性存在于共性中)     7.构造对象使用构造器:构造器的提出,构造器是一种特殊的方法,构造对象并对其初始化皇冠APP下载_皇冠APP官网下载     例:Data类的构造器叫Data     ewData()---构造一个新对象,且初始化当前时间     Datahappyday=newData()---把一个对象赋值给一个变量happyday,从而使该对象能够多次使用,此处要声明的使变量与对象变量二者是不同的.new返回的值是一个引用

     构造器特点:构造器可以有0个,一个或多个参数构造器和类有相同的名字皇冠APP下载_皇冠APP官网下载一个类可以有多个构造器构造器总是和new运算符一起使用8.重载:当多个方法具有相同的名字而含有不同的参数时,便发生重载.编译器必须挑选出调用哪个方法

     9.包(package)Java允许把一个或多个类收集在一起成为一组,称作包,以便于组织任务,标准Java库分为许多包java.langjava.utiljava,net等,包是分层次的所有的java包都在java和javax包层次内皇冠APP下载_皇冠APP官网下载     10.继承思想:允许在已经存在的类的基础上构建新的类,当你继承一个已经存在的类时,那么你就复用了这个类的方法和字段,同时你可以在新类中添加新的方法和字段     11.扩展类:扩展类充分体现了is-a的继承关系.形式为:class(子类)extends(基类)     12.多态:在java中,对象变量是多态的.而java中不支持多重继承

     13.动态绑定:调用对象方法的机制     (1)编译器检查对象声明的类型和方法名皇冠APP下载_皇冠APP官网下载     (2)编译器检查方法调用的参数类型     (3)静态绑定:若方法类型为priavtestaticfinal编译器会准确知道该调用哪个方法     (4)当程序运行并且使用动态绑定来调用一个方法时,那么虚拟机必须调用x所指向的对象的实际类型相匹配的方法版本

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