//用数组实现银行与客户的多重关系

package banking4;

public class Bank {

private Customer[] customers;

private int numberOfCustomer;//用于记录customer个数

public Bank(){

customers=new Customer[5];

}

public void addCustomer(String f,String l){

Customer cust=new Customer(f,l);

customers[numberOfCustomer]=cust;

numberOfCustomer++;

}

public int getNumOfCustomers(){//获取customer个数

return numberOfCustomer;

}

public Customer getCustomer(int index){//返回指定索引位置

return customers[index];

}

}

 

 

 

package testbanking1;

import banking4.*;

public class testbanking4 {

public static void main(String[] args){

Bank bank=new Bank();

bank.addCustomer("吕","青青");

bank.addCustomer("吕", "荣玉");

bank.addCustomer("吕", "跃文");

bank.addCustomer("顾", "怀英");

for(int i=0;i<bank.getNumOfCustomers();i++){

Customer customer=bank.getCustomer(i);

System.out.println("customer:"+i+customer.getFirstName()+customer.getLastName());

}

}

}