package Test; public class L3_1 { public static void main(String[] args) { C c1=new C(100); C c2=new C(100); System.out.println(c1.equals(c2)); } } class B { private int i; B(int i) { this.i=i; } public boolean equals(B b2) //面向对象-->多态 { if(this.i==b2.i) return true; else return false; } } class C extends B //面向对象-->继承 { private int j; C(int j) { super(j); //初始化父类的带参数构造函数->B(int i) this.j=j; } public boolean equals(B b2) { C c=(C)b2; //传递的参数是B类,需要强制转换 if (this.j==c.j) return true; else return false; } }