92 lines
2.8 KiB
Java
92 lines
2.8 KiB
Java
package com.ff.base.utils;
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import java.math.BigDecimal;
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import java.math.RoundingMode;
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import java.util.Optional;
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import java.util.Random;
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import java.util.concurrent.ThreadLocalRandom;
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public class NumberUtils {
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/**
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* 计算比例
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*
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* @param totalCount 总计数
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* @param remainingCount 剩余计数
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* @param scale 规模
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* @return {@link BigDecimal }
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*/
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public static BigDecimal calculateProportion(Number totalCount, Number remainingCount, int scale) {
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BigDecimal total = Optional.ofNullable(totalCount)
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.map(val -> new BigDecimal(val.toString()))
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.orElse(BigDecimal.ZERO);
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BigDecimal remaining = Optional.ofNullable(remainingCount)
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.map(val -> new BigDecimal(val.toString()))
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.orElse(BigDecimal.ZERO);
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if (total.compareTo(BigDecimal.ZERO) != 0) {
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return remaining.divide(total, scale, RoundingMode.HALF_UP).multiply(new BigDecimal("100")).setScale(2, RoundingMode.DOWN);
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} else {
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return BigDecimal.ZERO;
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}
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}
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/**
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* 在两个 BigDecimal 数值之间生成一个随机数
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*
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* @param min 最小值
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* @param max 最大值
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* @return 随机生成的 BigDecimal 数值
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*/
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public static BigDecimal getRandomBigDecimal(BigDecimal min, BigDecimal max) {
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// 确保 min 小于 max
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if (min.compareTo(max) > 0) {
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throw new IllegalArgumentException("最小值应小于最大值");
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}
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// 计算范围的差值
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BigDecimal range = max.subtract(min);
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// 使用 ThreadLocalRandom 生成 [0, 1) 之间的随机数
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double randomDouble = ThreadLocalRandom.current().nextDouble();
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// 计算随机值
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BigDecimal randomValue = min.add(range.multiply(BigDecimal.valueOf(randomDouble)));
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// 设置保留两位小数
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return randomValue.setScale(2, RoundingMode.HALF_UP);
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}
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/**
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* 生成随机码
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*
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* @return {@link String }
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*/
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public static String generateRandomCode(Integer size) {
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Random random = new Random();
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StringBuilder sb = new StringBuilder();
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// 每位字符可以是字母（A-Z, a-z）或数字（0-9）
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for (int i = 0; i <size ; i++) {
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int choice = random.nextInt(3);
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if (choice == 0) {
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// 随机字母（大写或小写）
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char letter = (char) ('A' + random.nextInt(26));
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sb.append(letter);
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} else if (choice == 1) {
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// 随机小写字母
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char letter = (char) ('a' + random.nextInt(26));
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sb.append(letter);
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} else {
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// 随机数字
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sb.append(random.nextInt(10));
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}
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}
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return sb.toString();
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}
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}
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