題目描述
一個在子類別的方法覆寫了父類別的方法,這個子類別仍然可以使用「super」這個關鍵字去呼叫到父類別被覆寫的方法。如果您寫了「super.func()」去呼叫「 func()」這個方法,會呼叫到父類別的「func()」方法。
您需要讓您的程式能輸出以下文字:
Hello I am a motorcycle, I am a cycle with an engine.
My ancestor is a cycle who is a vehicle with pedals.
My ancestor is a cycle who is a vehicle with pedals.
原題網址
解題概念
使用super關鍵字可以在子類別呼叫被子類別覆寫的父類別方法。
參考答案
import java.util.*;
import java.io.*;
class BiCycle
{
String define_me()
{
return "a vehicle with pedals.";
}
}
class MotorCycle extends BiCycle
{
String define_me()
{
return "a cycle with an engine.";
}
MotorCycle()
{
System.out.println("Hello I am a motorcycle, I am "+ define_me());
String temp=super.define_me();
System.out.println("My ancestor is a cycle who is "+ temp );
}
}
class Solution{
public static void main(String []argh)
{
MotorCycle M=new MotorCycle();
}
}