package pkg;
class apple{
int func(int i) {
System.out.println("func("+i+")");
return 0;
}
void func(char c) {
System.out.println("func("+c+")");
}
void func() {//unique,only one
System.out.println("Apple:you are wanted");
}
}
class fruit extends apple{
int func(int i) {//will override father
System.out.println("Fruit-Func("+i+")");
return 0;
}
@Override void func(char c) {// will override father
System.out.println("Fruit-Func("+c+")");
}
void func(String str) {//new ADD
System.out.println("Fruit:"+str);
}
}
public class p136 {
public static void main(String[] args) {
fruit obj=new fruit();
obj.func('x');//Extend method,override
obj.func(8);//Extend method,override
obj.func("google,hire me");//Son new ADD
obj.func(); //father func
}
}
OUTPUT:
Fruit-Func(x)
Fruit-Func(8)
Fruit:google,hire me
Apple:you are wanted
总结:
1、父子的args一样,返回类型必须兼容(实测必须一样)。
2、父子同名函数,子类的方法将override/覆盖父类方法。
3、@Override,用于告诉编译器,子类方法必须覆盖掉父类的一个方法,否则提示我出错*。
*参考文献:https://blog.csdn.net/woshisangsang/article/details/78308945