package 银行储户;

public class Depositor {

	private String id;

	private String name;

	private double balance;

	public Depositor(String id,String name,double bal) {

		// TODO Auto-generated constructor stub

		super();

		this.id=id;

		this.name=name;

		this.balance = bal;

	}

	public double getBalance() {

		return balance;

		}

		public void setBalance(double balance) {

		this.balance = balance;

		}

		public String getId() {

		return id;

		}

		public void setId(String id) {

		this.id = id;

		}

		public String getName() {

		return name;

		}

		public void setName(String name) {

			this.name=name;

		}

}

package 银行储户;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

public class TestMap {

	public double getBalance(Map depositor,String id){

		System.out.print("id:"+id);

	return depositor.get(id).hashCode();

	}

	public static void main(String args[]) {

		Map h = new HashMap(); Depositor a1 = new Depositor("1001","zhangsan",12345); Depositor a2 = new Depositor("1002","tom",8888.50);

		Depositor a3 = new Depositor("1003","mary",6666);

		h.put("1001", a1);

		h.put("1002", a2);

		h.put("1003", a3);

		TestMap hme = new TestMap();

		//map

		Set keySet= h.keySet();

		Iterator it = keySet.iterator();

		double sum = 0;

		while(it.hasNext()){

		Object key = it.next();

		Depositor a = (Depositor) h.get(key);

		System.out.println("id:"+a.getId()+"Balance"+a.getBalance()); //

		sum += a.getBalance();

		}

		System.out.println("sum:"+sum);

		}

}