完善常用工具类.

hippo4j-common/src/main/java/cn/hippo4j/common/toolkit/CollectionUtil.java

@@ -1,6 +1,7 @@
 package cn.hippo4j.common.toolkit;
 
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
 
 /**
@@ -27,6 +28,37 @@ public class CollectionUtil {
         return null;
     }
 
+    /**
+     * Is empty.
+     *
+     * @param list
+     * @return
+     */
+    public static boolean isEmpty(List<?> list) {
+        return list == null || list.isEmpty();
+    }
+
+    /**
+     * Is not empty.
+     *
+     * @param list
+     * @return
+     */
+    public static boolean isNotEmpty(List<?> list) {
+        return !isEmpty(list);
+    }
+
+
+    /**
+     * Is empty.
+     *
+     * @param map
+     * @return
+     */
+    public static boolean isEmpty(Map<?, ?> map) {
+        return map == null || map.isEmpty();
+    }
+
     /**
      * Is not empty.
      *
@@ -34,7 +66,7 @@ public class CollectionUtil {
      * @return
      */
     public static boolean isNotEmpty(Map<?, ?> map) {
-        return map != null && map.isEmpty() == false;
+        return !isEmpty(map);
     }
 
 }