From 32e29438d7be0d0279443f9cdfc643aaaa46a216 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A4=A7=E7=81=AByzs?= <835476090@qq.com>
Date: Tue, 4 May 2021 15:00:49 +0800
Subject: [PATCH] =?UTF-8?q?NumberUtil=E7=B1=BB=E6=B7=BB=E5=8A=A0percent?=
 =?UTF-8?q?=E6=96=B9=E6=B3=95=E2=9C=92=EF=B8=8F?=
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---
 .../java/cn/hutool/core/util/NumberUtil.java  | 25 +++++++++++++++++++
 .../cn/hutool/core/util/NumberUtilTest.java   | 10 ++++++++
 2 files changed, 35 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
index 392e4ce63..644d5c154 100644
--- a/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/util/NumberUtil.java
@@ -765,6 +765,18 @@ public class NumberUtil {
 		return (int) Math.ceil((double) v1 / v2);
 	}
 
+	/**
+	 * 求百分比(取整)  (3,10) => 30
+	 *
+	 * @param num   当前num
+	 * @param total 总长度
+	 * @return int 百分比(取整)
+	 * @since 5.6.5
+	 */
+	public static int percent(int num, int total) {
+		return (int) ((float) num / (float) total * 100);
+	}
+
 	// ------------------------------------------------------------------------------------------- round
 
 	/**
@@ -1082,6 +1094,19 @@ public class NumberUtil {
 		return format.format(number);
 	}
 
+	/**
+	 * 求百分比(带精度)(带百分号后缀)  (3,10,0) => 30%
+	 *
+	 * @param num   当前num
+	 * @param total 总长度
+	 * @param scale 精度(保留小数点后几位)
+	 * @return String 百分比(带百分号后缀)
+	 * @since 5.6.5
+	 */
+	public static String formatPercent(Number num, Number total, int scale) {
+		return formatPercent(num.doubleValue() / total.doubleValue(), scale);
+	}
+
 	// ------------------------------------------------------------------------------------------- isXXX
 
 	/**
diff --git a/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java b/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
index 7a7e437f3..838dc79b9 100644
--- a/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/util/NumberUtilTest.java
@@ -178,10 +178,20 @@ public class NumberUtilTest {
 		Assert.assertTrue(NumberUtil.equals(new BigDecimal("0.00"), BigDecimal.ZERO));
 	}
 
+	@Test
+	public void percentTest(){
+		Assert.assertEquals(30, NumberUtil.percent(3, 10));
+		Assert.assertEquals(20, NumberUtil.percent(1, 5));
+	}
+
 	@Test
 	public void formatPercentTest() {
 		String str = NumberUtil.formatPercent(0.33543545, 2);
 		Assert.assertEquals("33.54%", str);
+
+		Assert.assertEquals("30%", NumberUtil.formatPercent(3, 10, 0));
+		Assert.assertEquals("33.33%", NumberUtil.formatPercent(1, 3, 2));
+		Assert.assertEquals("33.333%", NumberUtil.formatPercent(1, 3, 3));
 	}
 
 	@Test