手机号

package com.ytu;

public abstract class SIM {
	public abstract void setNumber(String n);
	public abstract String giveNumber();
	public abstract String giveCorpName();
	

}
package com.ytu;

public class SIMOfChinaMobile extends SIM{
	String number;

	@Override
	public String giveCorpName() {
		// TODO Auto-generated method stub
		return "中国移动";
	}

	@Override
	public String giveNumber() {
		// TODO Auto-generated method stub
		return number;
	}

	@Override
	public void setNumber(String n) {
		// TODO Auto-generated method stub
		number=n;
		
	}

}
package com.ytu;

public class SIMOfChinaUnicom extends SIM{
	String number;

	@Override
	public String giveCorpName() {
		// TODO Auto-generated method stub
		return "中国联通";
	}

	@Override
	public String giveNumber() {
		// TODO Auto-generated method stub
		return number;
	}

	@Override
	public void setNumber(String n) {
		// TODO Auto-generated method stub
		number=n;
		
	}

}
package com.ytu;

public class MobileTelephone {
	SIM card;
	public void useSIM(SIM card){
		this.card=card;
	}
	public void showMess(){
		System.out.println("使用的卡是："+card.giveCorpName()+"提供的");
		System.out.println("手机号码是："+card.giveNumber());
	}

}
package com.ytu;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		// TODO Auto-generated method stub
		MobileTelephone telephone=new MobileTelephone();
		SIM sim=new SIMOfChinaMobile();
		sim.setNumber("18363829080");
		telephone.useSIM(sim);
		telephone.showMess();
		sim=new SIMOfChinaUnicom();
		sim.setNumber("18364556322");
		telephone.useSIM(sim);
		telephone.showMess();

	}

}