test.java

JAVA培训用实用代码

interface Runner { 
	public void run();
}

interface Swimmer {
	public double swim();
}

abstract class Animal  {
	abstract public int eat();
} 

class Person extends Animal implements Runner,Swimmer {
	public void run() {
		System.out.println("run!");  
	}
	public double swim()  {
		double speed = 20;
		return speed;
	}
	public int eat() {
		return 3;
	}
}

public class Test{
	public static void main(String args[]){
		Test t = new Test();
		Person p = new Person();
		t.m1(p);
		t.m2(p);
		t.m3(p);
	}
	public void m1(Runner f) {f.run();}
	public void m2(Swimmer s) {s.swim();}
	public void m3(Animal a) {a.eat();}
}