public class SIM {
long number;
SIM(long number){
this.number = number;
}
long getNumber() {
return number;
}
}
public class phone {
SIM sim;//声明对象
void setSIM(SIM card) {
sim = card;
}
long lookNumber() {
return sim.getNumber();
}
}
public class shouji {
public static void main(String[] args) {
SIM simOne = new SIM(18375431234L);//为对象分配实体
phone mobile = new phone();
mobile.setSIM(simOne);//调用方法setsim
System.out.println("手机号码:"+mobile.lookNumber());
SIM simTwo = new SIM(18375432345L);
mobile.setSIM(simTwo);
System.out.println("手机号码更换为:"+mobile.lookNumber());
}
}