一個公司：數組工資
一個公司：list工資
如何統一？

1. 正常編碼

public class PayModel { private String userName;//支付工資的人員 private double pay;//支付的工資數額 }public class SalaryManager{//用數組管理 private PayModel[] pms = null;//獲取工資列表 public PayModel[] getPays(){return pms;}//計算工資 public void calcSalary(){ PayModel pm1 = new PayModel();pm1.setPay(2200);pm1.setUserName("王五");PayModel pm2 = new PayModel();pm2.setPay(3600);pm2.setUserName("趙六");pms = new PayModel[2];pms[0] = pm1;pms[1] = pm2;} }public class PayManager{//聚合對象，這里是Java的集合對象 private List list = new ArrayList();//獲取工資列表 public List getPayList(){return list;}//計算工資，其實應該有很多參數，為了演示從簡 public void calcPay(){ PayModel pm1 = new PayModel();pm1.setPay(3800);pm1.setUserName("張三");PayModel pm2 = new PayModel();pm2.setPay(5800);pm2.setUserName("李四");list.add(pm1);list.add(pm2);} }public static void main(String[] args) {//訪問集團的工資列表PayManager payManager= new PayManager();//先計算再獲取payManager.calcPay();Collection payList = payManager.getPayList();Iterator it = payList.iterator();System.out.println("集團工資列表：");while(it.hasNext()){PayModel pm = (PayModel)it.next();System.out.println(pm);}//訪問新收購公司的工資列表SalaryManager salaryManager = new SalaryManager();//先計算再獲取salaryManager.calcSalary();PayModel[] pms = salaryManager.getPays();System.out.println("新收購的公司工資列表：");for(int i=0;i<pms.length;i++){System.out.println(pms[i]);}}

2. 統一訪問接口

public class ArrayIteratorImpl implements Iterator{//用來存放被迭代的聚合對象 private SalaryManager aggregate = null;//用來記錄當前迭代到的位置索引 private int index = -1;public ArrayIteratorImpl(SalaryManager aggregate){this.aggregate = aggregate;} public void first(){index = 0;}public void next(){if(index < this.aggregate.size()){index = index + 1;}}public boolean isDone(){if(index == this.aggregate.size()){return true;}return false;}public Object currentItem(){return this.aggregate.get(index);} }public class SalaryManager extends Aggregate{//用數組管理 private PayModel[] pms = null; public PayModel[] getPays(){return pms;}//計算工資，其實應該有很多參數，為了演示從簡 public void calcSalary(){ PayModel pm1 = new PayModel();pm1.setPay(2200);pm1.setUserName("王五");PayModel pm2 = new PayModel();pm2.setPay(3600);pm2.setUserName("趙六");pms = new PayModel[2];pms[0] = pm1;pms[1] = pm2;}public Iterator createIterator(){return new ArrayIteratorImpl(this);}public Object get(int index){Object retObj = null;if(index < pms.length){retObj = pms[index];}return retObj;}public int size(){return this.pms.length;} }public static void main(String[] args) {//訪問集團的工資列表PayManager payManager= new PayManager();//先計算再獲取payManager.calcPay();System.out.println("集團工資列表：");test(payManager.createIterator());//訪問新收購公司的工資列表SalaryManager salaryManager = new SalaryManager();//先計算再獲取salaryManager.calcSalary();System.out.println("新收購的公司工資列表：");test(salaryManager.createIterator());}//聚合對象的迭代器 private static void test(Iterator it){//循環輸出聚合對象中的值//首先設置迭代器到第一個元素it.first();while(!it.isDone()){//取出當前的元素來Object obj = it.currentItem();System.out.println("the obj=="+obj);//如果還沒有迭代到最后，那么就向下迭代一個it.next();}}

總結

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