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http://www.runoob.com/java/java-abstraction.html 在面向对象的概念中,所有的对象都是通过类来描绘...
http://www.runoob.com/java/java-polymorphism.html 多态是同一个行为具有多个不同表现形式或形态的...
http://www.runoob.com/java/java-override-overload.html 重写(Override) 重写是子...
http://www.runoob.com/java/java-inheritance.html 概念: 继承就是创建分等级层次的类,让子类继承...