helppeople.java

JAVA编程思想源代码 值得一下 很难找的

package chapter7;

public class HelpPeople {
	public static void a(CanWalk x) {
		x.walk();
	}

	public static void b(CanSwim x) {
		x.swim();
	}

	public static void c(CanFly x) {
		x.fly();
	}

	public static void d(Personx x) {
		x.walk();
	}

	public static void main(String[] args) {
		SuperMan s = new SuperMan();
		a(s); // 相当于CanFight s=new SuperMan();
		b(s); // 相当于CanSwim s=new SuperMan();
		c(s); // 相当于CanFly s=new SuperMan();
		d(s);
	}
}