java金额转换，将数字金额转换为7位大写

来看题:

要将输入的数字(大于零并小于七位)转成如图格式金额

示例输入:

12345

示例输出:

零佰零拾壹万贰千叁佰肆拾伍

题解:

0-9对应的数字可以利用数组下标轻松转换为汉字，因此我们可以先将12345转为壹贰叁肆伍，然后再在前面补零补足7位：

零零壹贰叁肆伍

最后插入单位即可。

首先定义两个数组，一个用来存储汉字单位，一个用来存储汉字进位单位：

java 复制代码

  private static final String []yuan = {"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
  private static final String []wei = {"佰","拾","万","千","佰","拾","元"};

然后做输入数字处理:

java 复制代码

int money = 0;
        while(true) {
            System.out.println("请输入金额：");
            money = sc.nextInt();
            if (money > 0 && money < 10000000) {
                break;
            } else {
                System.out.println("输入错误");
            }

接下来我们可以先将数字转为汉字表示，这里因为频繁使用字符串拼接，因此创建StringBuilder：

java 复制代码

StringBuilder result = new StringBuilder();
        while(money > 0) {
            int temp = money % 10;
            result.insert(0, change(temp));
            money /= 10;
        }

change代码如下:

java 复制代码

    public static String change(int num) {
        return yuan[num];
    }

然后补足7位，可以先计算长度看看需要补几个零，然后用StringBuilder提供的insert方法可以轻松在头部插入:

java 复制代码

        int count = 7 - result.length();
        for (int i = 0; i < count; i++) {
            result.insert(0, "零");
        }
        System.out.println(result);

最后我们插入单位，定义两个下标i和j，j表示插入位置，i表示要插入的单位的数组下标。注意j隔一位插入即可:

java 复制代码

        // 插入单位
        int j = 1;
        int f = 0;
        while(j < result.length() && f < wei.length){
            result.insert(j, wei[f]);
            j += 2; // 这里注意j要隔一位进行插入
            f++;
        }
        System.out.println(result);

完整代码:

java 复制代码

package mylearn;
import java.util.*;

public class Test {
    private static final Scanner sc = new Scanner(System.in);
    private static final String []yuan = {"零","壹","贰","叁","肆","伍","陆","柒","捌","玖"};
    private static final String []wei = {"佰","拾","万","千","佰","拾","元"};
    public static void main(String[] args) {
        // 指针
        int money = 0;
        while(true) {
            System.out.println("请输入金额：");
            money = sc.nextInt();
            if (money > 0 && money < 100000000) {
                break;
            } else {
                System.out.println("输入错误");
            }
        }
        StringBuilder result = new StringBuilder();
        while(money > 0) {
            int temp = money % 10;
            result.insert(0, change(temp));
            money /= 10;
        }

        int count = 7 - result.length();
        for (int i = 0; i < count; i++) {
            result.insert(0, "零");
        }
        System.out.println(result);
        // 插入单位
        int j = 1;
        int f = 0;
        while(j < result.length() && f < wei.length){
            result.insert(j, wei[f]);
            j += 2;
            f++;
        }
        System.out.println(result);

    }

    public static String change(int num) {
        return yuan[num];
    }


}

end