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Update java-collection-questions-02.md #2439

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2 changes: 1 addition & 1 deletion docs/java/collection/java-collection-questions-02.md
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Expand Up @@ -83,7 +83,7 @@ head:

`NavigableMap` 接口提供了丰富的方法来探索和操作键值对:

1. **定向搜索**: `ceilingEntry()`, `floorEntry()`, `higherEntry()`和 `lowerEntry()` 等方法可以用于定位大于、小于、大于等于、小于等于给定键的最接近的键值对。
1. **定向搜索**: `ceilingEntry()`, `floorEntry()`, `higherEntry()`和 `lowerEntry()` 等方法可以用于定位大于等于、小于等于、严格大于、严格小于给定键的最接近的键值对。
2. **子集操作**: `subMap()`, `headMap()`和 `tailMap()` 方法可以高效地创建原集合的子集视图，而无需复制整个集合。
3. **逆序视图**:`descendingMap()` 方法返回一个逆序的 `NavigableMap` 视图，使得可以反向迭代整个 `TreeMap`。
4. **边界操作**: `firstEntry()`, `lastEntry()`, `pollFirstEntry()`和 `pollLastEntry()` 等方法可以方便地访问和移除元素。
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