摘要：
继承：关键字：extends格式：类A extends 类B 类A为父类 类B为子类功用：让类之间产生关系===》》多态提高代码的复用性+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++注意：切勿滥用继承，必须有所属关系简单代码举例： 1 class C 2 { 3 void demo1(){} 4 } 5 6 class B extends C 7 { 8 void demo2(){} 9 //void demo1(){} B和A不必作此声明10 ... 阅读全文
