Java重载经典面试题

朱雀 2022-03-26 06:46 258阅读 0赞

public class StaticDispatch {
    	static abstract class Human{
    		
    	}
    	static class Man extends Human{
    		
    	}
    	static class Woman extends Human{
    		
    	}
    	public void sayHello(Human guy) {
    		System.out.println("hello , guy!");
    	}
    	public void sayHello(Man guy) {
    		System.out.println("hello , gentle!");
    	}
    	public void sayHello(Woman guy) {
    		System.out.println("hello , ladly!");
    	}
    	public static void main(String[] args) {
    		Human man = new Man();
    		Human woman = new Woman();
    		StaticDispatch sr = new StaticDispatch();
    		sr.sayHello(man);
    		sr.sayHello(woman);
    	}
    }
    /***************************以下代码依次屏蔽char、int、float。。。。看看输出啥？************************************/
    
    import java.io.Serializable;
    
    public class Overload {
    	public static void sysHello(Object arg) {
    		System.out.println("hello Object");
    	}
    	public static void sysHello(float arg) {
    		System.out.println("hello float");
    	}
    	public static void sysHello(double arg) {
    		System.out.println("hello float");
    	}
    	public static void sysHello(int arg) {
    		System.out.println(arg);
    		System.out.println("hello int");
    	}
    	public static void sysHello(long arg) {
    		System.out.println("hello long");
    	}
    	public static void sysHello(Character arg) {
    		System.out.println("hello Character");
    	}
    	public static void sysHello(char arg) {
    		System.out.println("hello char");
    	}
    	public static void sysHello(char... arg) {
    		System.out.println("hello char...");
    	}
    	public static void sysHello(Serializable arg) {
    		System.out.println("hello Serializable...");
    	}
    	
    	public static void main(String[] args) {
    		sysHello('b');
    	}
    }

这两段代码摘抄自周大神的《深入理解Java虚拟机》一书中，能答上的小伙伴证明你对重载理解的非常透彻了。。。。。。。。