From a65cd34ba895a5d51dcbbdb145aa119d4d06c306 Mon Sep 17 00:00:00 2001
From: Run Yan <run.yan@lvyuetravel.com>
Date: Thu, 12 Sep 2019 17:08:33 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E7=BA=BF=E7=A8=8B=E5=AE=89?=
 =?UTF-8?q?=E5=85=A8=E7=9A=84map?=
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---
 .../main/java/cn/hutool/core/map/MapUtil.java | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java b/hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java
index cf3e382c1..53e6cbdea 100644
--- a/hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java
+++ b/hutool-core/src/main/java/cn/hutool/core/map/MapUtil.java
@@ -14,6 +14,7 @@ import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
 import java.util.TreeMap;
+import java.util.concurrent.ConcurrentHashMap;
 
 import cn.hutool.core.collection.CollectionUtil;
 import cn.hutool.core.convert.Convert;
@@ -939,4 +940,43 @@ public class MapUtil {
 		
 		return map;
 	}
+
+	/**
+	 * 新建一个初始容量为{@link MapUtil#DEFAULT_INITIAL_CAPACITY} 的ConcurrentHashMap
+	 *
+	 * @param <K> key的类型
+	 * @param <V> value的类型
+	 * @return ConcurrentHashMap
+	 */
+	public static <K, V> ConcurrentHashMap<K, V> newConcurrentHashMap() {
+		return new ConcurrentHashMap<>(DEFAULT_INITIAL_CAPACITY);
+	}
+
+	/**
+	 * 新建一个ConcurrentHashMap
+	 *
+	 * @param size 初始容量，当传入的容量小于等于0时，容量为{@link MapUtil#DEFAULT_INITIAL_CAPACITY}
+	 * @param <K> key的类型
+	 * @param <V> value的类型
+	 * @return ConcurrentHashMap
+	 */
+	public static <K, V> ConcurrentHashMap<K, V> newConcurrentHashMapWithSize(int size) {
+		size = size <= 0 ? DEFAULT_INITIAL_CAPACITY : size;
+		return new ConcurrentHashMap<>(size);
+	}
+
+	/**
+	 *  传入一个Map将其转化为ConcurrentHashMap类型
+	 *
+	 * @param map map
+	 * @param <K> key的类型
+	 * @param <V> value的类型
+	 * @return ConcurrentHashMap
+	 */
+	public static <K, V> ConcurrentHashMap<K, V> newConcurrentHashMap(Map<K, V> map) {
+		if(isEmpty(map)) {
+			return new ConcurrentHashMap<>(DEFAULT_INITIAL_CAPACITY);
+		}
+		return new ConcurrentHashMap<>(map);
+	}
 }