From 3b3871ba1e5a6e68a7c6975a1683caebdf2fd939 Mon Sep 17 00:00:00 2001
From: Zjp <1215582715@qq.com>
Date: Wed, 15 Feb 2023 21:12:21 +0800
Subject: [PATCH] fix bug;

---
 .../src/main/java/cn/hutool/core/net/MaskBit.java        | 3 ++-
 .../src/test/java/cn/hutool/core/net/Ipv4UtilTest.java   | 9 ++++++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/hutool-core/src/main/java/cn/hutool/core/net/MaskBit.java b/hutool-core/src/main/java/cn/hutool/core/net/MaskBit.java
index 5b51c0c10..934a93180 100644
--- a/hutool-core/src/main/java/cn/hutool/core/net/MaskBit.java
+++ b/hutool-core/src/main/java/cn/hutool/core/net/MaskBit.java
@@ -2,6 +2,7 @@ package cn.hutool.core.net;
 
 import cn.hutool.core.lang.Assert;
 import cn.hutool.core.map.BiMap;
+
 import java.util.HashMap;
 
 /**
@@ -83,6 +84,6 @@ public class MaskBit {
 	 */
 	public static long getMaskIpLong(final int maskBit) {
 		Assert.isTrue(MASK_BIT_MAP.containsKey(maskBit), "非法的掩码位数：{}", maskBit);
-		return -1L << (32 - maskBit);
+		return (0xffffffffL << (32 - maskBit)) & 0xffffffffL;
 	}
 }
diff --git a/hutool-core/src/test/java/cn/hutool/core/net/Ipv4UtilTest.java b/hutool-core/src/test/java/cn/hutool/core/net/Ipv4UtilTest.java
index 97497d5b4..9ccf674f8 100644
--- a/hutool-core/src/test/java/cn/hutool/core/net/Ipv4UtilTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/net/Ipv4UtilTest.java
@@ -121,7 +121,7 @@ public class Ipv4UtilTest {
 	}
 
 	@Test
-	public void ipv4ToLongTest(){
+	public void ipv4ToLongTest() {
 		long l = Ipv4Util.ipv4ToLong("127.0.0.1");
 		Assert.assertEquals(2130706433L, l);
 		l = Ipv4Util.ipv4ToLong("114.114.114.114");
@@ -132,6 +132,13 @@ public class Ipv4UtilTest {
 		Assert.assertEquals(4294967295L, l);
 	}
 
+	@Test
+	public void getMaskIpLongTest() {
+		for (int i = 1; i <= 32; i++) {
+			Assert.assertEquals(Ipv4Util.ipv4ToLong(MaskBit.get(i)), MaskBit.getMaskIpLong(i));
+		}
+	}
+
 	@SuppressWarnings("SameParameterValue")
 	private void testGenerateIpList(final String fromIp, final String toIp) {
 		Assert.assertEquals(