最新要闻

广告

手机

iphone11大小尺寸是多少？苹果iPhone11和iPhone13的区别是什么？

iphone11大小尺寸是多少？苹果iPhone11和iPhone13的区别是什么？

 警方通报辅警执法直播中被撞飞：犯罪嫌疑人已投案

警方通报辅警执法直播中被撞飞：犯罪嫌疑人已投案

家电

  1. 首页
  2. 移动通信
  3. 内容

世界观热点：Java 双指针项目中的实际应用

来源：博客园


(相关资料图)

背景说明

最近在做财务相关的系统，对账单核销预付款从技术角度来看就是将两个数组进行合并

对账单核销预付款前提条件：

  1. 对账单总金额必须等于未核销金额

数据示例

对账单数据

单号金额
B0001100
B000280
B0003120

预付款数据

单号未核销金额
PRE001110
PRE002190

结果数据

预付款单号核销金额对账单号
PRE001100B001
PRE00110B002
PRE00270B002
PRE002120B003

通过分析可以使用JAVA双指针算法可以实现这个需求双指针主要用于遍历数组，两个指针指向不同的元素，从而协同完成任务。

代码实现

public static void main(String[] args) {    class Info {        private String formId;        private BigDecimal amount;            public String getFormId() {            return formId;        }            public void setFormId(String formId) {            this.formId = formId;        }            public BigDecimal getAmount() {            return amount;        }            public void setAmount(BigDecimal amount) {            this.amount = amount;        }    }        List billBatchlist = new ArrayList<>();    Info info = new Info();    info.setFormId("B0001");    info.setAmount(new BigDecimal(100));    billBatchlist.add(info);    info = new Info();    info.setFormId("B0002");    info.setAmount(new BigDecimal(80));    billBatchlist.add(info);    info = new Info();    info.setFormId("B0003");    info.setAmount(new BigDecimal(120));    billBatchlist.add(info);        List payVerifyControlList = new ArrayList<>();    Info info1 = new Info();    info1.setFormId("PRE0001");    info1.setAmount(new BigDecimal(110));    payVerifyControlList.add(info1);    info1 = new Info();    info1.setFormId("PRE0002");    info1.setAmount(new BigDecimal(190));    payVerifyControlList.add(info1);    billBatchlist.forEach(a -> {        System.out.println("BillFormId:" + a.formId + ",Amount:" + a.getAmount());    });    payVerifyControlList.forEach(a -> {        System.out.println("PreFormId:" + a.formId + ",Amount:" + a.getAmount());    });    System.out.println("==================================");        int i = 0, j = 0;    BigDecimal preAmount = new BigDecimal(0);    BigDecimal billAmount = new BigDecimal(0);    while (i < billBatchlist.size() && j < payVerifyControlList.size()) {        if (preAmount.compareTo(BigDecimal.ZERO) == 0) {            preAmount = billBatchlist.get(i).amount;        }        if (billAmount.compareTo(BigDecimal.ZERO) == 0) {            billAmount = payVerifyControlList.get(j).amount;        }            //当前核销金额        BigDecimal verifyAmount = new BigDecimal(0);        if (preAmount.compareTo(billAmount) > -1) {            verifyAmount = billAmount;            // pre剩余            preAmount = preAmount.subtract(verifyAmount);            billAmount = new BigDecimal(0);        } else {            verifyAmount = preAmount;            // bill剩余            billAmount = billAmount.subtract(verifyAmount);            preAmount = new BigDecimal(0);        }            System.out.println("当前核销金额：" + verifyAmount + ",preAmount剩余:" + preAmount + ",billAmount剩余:" + billAmount);        //大于等于0        if (preAmount.compareTo(BigDecimal.ZERO) == 0) {            i++;        }        if (billAmount.compareTo(BigDecimal.ZERO) == 0) {            j++;        }    }    }

打印结果：

BillFormId:B0001,Amount:100BillFormId:B0002,Amount:80BillFormId:B0003,Amount:120PreFormId:PRE0001,Amount:110PreFormId:PRE0002,Amount:190==================================当前核销金额：100,preAmount剩余:0,billAmount剩余:10当前核销金额：10,preAmount剩余:70,billAmount剩余:0当前核销金额：70,preAmount剩余:0,billAmount剩余:120当前核销金额：120,preAmount剩余:0,billAmount剩余:0

关键词：