关于重载与重写

最新推荐文章于 2025-03-02 02:11:32 发布

原创最新推荐文章于 2025-03-02 02:11:32 发布 · 533 阅读

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本文通过示例代码展示了Java中方法重写与重载的区别及应用。通过对不同对象类型的传递，演示了如何实现多态性和方法签名的变化。

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刚开始写东西,低调,来点简单的

重写与重载

重写

看一段代码

public class Picture {
	void draw(Object obj) {
		System.out.println("Super");
	}
}

public class Person extends Picture {
	public static void main(String[] args) {
		Object obj = new Object();
		String ob = new String();
		Number obn = new Integer(0);
		
//		Photo pi = new Photo();
		Picture pi = new Photo();
		pi.draw(ob);
		pi.draw(obn);
		pi.draw(obj);
	}
}
class Photo extends Picture {
	public void draw(String obj){
		System.out.println("Sub-s");
	}
	public void draw(Number obj){
		System.out.println("Sub-n");
	}
//	public void draw(Object obj){
//		System.out.println("Sub-o");
//	}
}

OK,看看打印了啥

Super
Super
Super

更改Class Photo

class Photo extends Picture {
	public void draw(String obj){
		System.out.println("Sub-s");
	}
	public void draw(Number obj){
		System.out.println("Sub-n");
	}
	public void draw(Object obj){
		System.out.println("Sub-o");
	}
}

再来看看打印了啥

Sub-o
Sub-o
Sub-o

重载

更改Class Picture

public class Picture {
	void draw(Number obj) {
		System.out.println("Super");
	}
}

Person 对象出错,改改就OK了

上面先放一边

看下面

public class Person extends Picture {
	public static void main(String[] args) {
		Object obj = new Object();
		String ob = new String();
		Number obn = new Integer(0);
		Float obf = new Float(0.0);
		Byte obd = new Byte("12");
		
		Photo pi = new Photo();
//		Picture pi = new Photo();
		pi.draw(obj);
		pi.draw(obn);
		pi.draw(obf);
		pi.draw(obd);
	}
}
class Photo extends Picture {
	public void draw(String obj){
		System.out.println("Sub-s");
	}
	public void draw(Number obj){
		System.out.println("Sub-n");
	}
	public void draw(Float obj){
		System.out.println("Sub-f");
	}
	public void draw(Object obj){
		System.out.println("Sub-o");
	}
}

看打印