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yzg-util-base/src/main/java/com/yanzuoguang/util/helper/MapHelper.java

@@ -93,4 +93,23 @@ public class MapHelper {
     public interface MapKey<T> {
         String getKey(T from);
     }
+
+    /**
+     * 将建添加到子数组中
+     *
+     * @param mapList
+     * @param key
+     * @param item
+     * @param <T>
+     * @param <M>
+     * @return
+     */
+    public static <T, M> List<M> addMapList(Map<T, List<M>> mapList, T key, M item) {
+        if (!mapList.containsKey(key)) {
+            mapList.put(key, new ArrayList<>());
+        }
+        List<M> ret = mapList.get(key);
+        ret.add(item);
+        return ret;
+    }
 }