@Override
public boolean equals(Object obj){
if(this==obj){return true;}
if (obj instanceof cus){
cus c1=(cus)obj;
return this.name.equals(c1.name) ;
}else {return false;}
}
@Override
public boolean equals(Object obj){
if(this==obj){return true;}
if (obj instanceof cus){
cus c1=(cus)obj;
return this.name.equals(c1.name) ;
}else {return false;}
}
Object 是所有引用类型的父类,父类变量接收子类对象是很自然的。