From c0461c16f61bdf50d6f00c3082e1017c43246664 Mon Sep 17 00:00:00 2001
From: "zongze.lee" <zongze.lee@outlook.com>
Date: Thu, 6 Nov 2025 02:09:57 +0800
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对于测试用例：
range1 = [1, 3]，其上界是 Bound.atMost(3)（右闭区间）
range2 = [3, 5]，其下界是 Bound.atLeast(3)（左闭区间）
在比较 Bound.atMost(3).compareTo(Bound.atLeast(3)) 时：
两者的值相等（都是3）
调用 compareIfSameBoundValue 方法
bt1 = CLOSE_UPPER_BOUND (code=2)
bt2 = CLOSE_LOWER_BOUND (code=-2)
两者是错位的（一个上界一个下界）
由于 bt1.isLowerBound() 为 false（因为是上界），所以返回 -1
这导致 boundedRange.getUpperBound().compareTo(other.getLowerBound()) < 0 为 true，判定区间不相交。
但实际上，[1,3] 和 [3,5] 在点3处是相交的，因为3既包含在第一个区间又包含在第二个区间中。
---
 .../cn/hutool/v7/core/lang/range/FiniteBound.java  |  8 +++++++-
 .../cn/hutool/v7/core/lang/range/BoundTest.java    | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/hutool-core/src/main/java/cn/hutool/v7/core/lang/range/FiniteBound.java b/hutool-core/src/main/java/cn/hutool/v7/core/lang/range/FiniteBound.java
index 2fbe5c5309..e8ec3221e0 100644
--- a/hutool-core/src/main/java/cn/hutool/v7/core/lang/range/FiniteBound.java
+++ b/hutool-core/src/main/java/cn/hutool/v7/core/lang/range/FiniteBound.java
@@ -200,8 +200,14 @@ class FiniteBound<T extends Comparable<? super T>> implements Bound<T> {
 		if (bt1 == bt2) {
 			return 0;
 		}
-		// 一为左边界，一为右边界，则左边界恒在右边界后
+		// 一为左边界，一为右边界
 		if (bt1.isDislocated(bt2)) {
+			// 特殊情况：右闭区间与左闭区间在同一点时，认为它们重合（用于区间相交判断）
+			if ((bt1 == BoundType.CLOSE_UPPER_BOUND && bt2 == BoundType.CLOSE_LOWER_BOUND) ||
+				(bt1 == BoundType.CLOSE_LOWER_BOUND && bt2 == BoundType.CLOSE_UPPER_BOUND)) {
+				return 0;
+			}
+			// 一般情况：左边界恒在右边界后
 			return bt1.isLowerBound() ? 1 : -1;
 		}
 		// 都为左边界，则封闭边界在前，若都为右边界，则封闭边界在后
diff --git a/hutool-core/src/test/java/cn/hutool/v7/core/lang/range/BoundTest.java b/hutool-core/src/test/java/cn/hutool/v7/core/lang/range/BoundTest.java
index b400a0476e..6e69865661 100644
--- a/hutool-core/src/test/java/cn/hutool/v7/core/lang/range/BoundTest.java
+++ b/hutool-core/src/test/java/cn/hutool/v7/core/lang/range/BoundTest.java
@@ -17,14 +17,28 @@
 package cn.hutool.v7.core.lang.range;
 
 import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
 /**
  * test for {@link Bound}
  */
 @SuppressWarnings("EqualsWithItself")
 public class BoundTest {
 
+	@Test
+	@DisplayName("测试相邻区间合并")
+	void testUnionIfIntersectedWithAdjacentRanges() {
+		BoundedRange<Integer> range1 = BoundedRange.close(1, 3);
+		BoundedRange<Integer> range2 = BoundedRange.close(3, 5);
+		BoundedRange<Integer> result = BoundedRangeOperation.unionIfIntersected(range1, range2);
+
+		assertEquals(Bound.atLeast(1), result.getLowerBound());
+		assertEquals(Bound.atMost(5), result.getUpperBound());
+	}
+
 	@Test
 	public void testEquals() {
 		final Bound<Integer> bound = new FiniteBound<>(1, BoundType.OPEN_UPPER_BOUND);