c# override,new关键字区别与使用(学习笔记)
时间:2010-12-03 来源:小聪崽的一切
先看段代码:
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace ConsoleApplication1
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{
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class Program
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{
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static void Main(string[] args)
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{
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baseClass bc;
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class1 ct1 = new class1();
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class2 ct2 = new class2();
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ct1.prinf();
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bc = ct1;
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bc.prinf();
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Console.WriteLine("---------------------");
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ct2.prinf();
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bc = ct2;
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bc.prinf();
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}
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}
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public class baseClass
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{
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private int index = 0;
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public virtual void prinf()
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{
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Console.WriteLine("这是基类虚方法" + index.ToString());
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}
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}
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public class class1 : baseClass
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{
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private int index = 1;
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public override void prinf()
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{
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Console.WriteLine("这是子类新的方法" + index.ToString());
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}
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}
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public class class2 : baseClass
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{
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private int index = 2;
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public new void prinf()
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{
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Console.WriteLine("这是子类新的方法" + index.ToString());
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}
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}
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}
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运行结果:
这是子类新的方法1
这是子类新的方法1
---------------------
这是子类新的方法2
这是基类虚方法0
如上
使用override重写printf方法,通过父类引用一样只能看到重写后的方法;
如果使用new隐藏printf方法,父类子类引用各自对应方法;
override重写虚方法,那么就只剩下重写以后的方法;
new隐藏基类的方法,那么基类的方法和当前类的方法同时存在只是被隐藏了;
真想弄些实际应用的例子,想好了补上.
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