Fixed the issue that removeHandler would cause all Handlers of the same Class to not receive events;

Author: LamGC

src/main/java/net/lamgc/utils/event/EventExecutor.java

@@ -84,8 +84,9 @@ public void addHandler(EventHandler handler) throws IllegalAccessException {
      * @param handler 要删除的EventHandler对象
      */
     public void removeHandler(EventHandler handler){
-        eventHandlerObjectMap.removeHandlerObject(handler);
-        eventHandlerList.removeEventHandler(handler);
+        if(!eventHandlerObjectMap.removeHandlerObject(handler)){
+            eventHandlerList.removeEventHandler(handler);
+        }
     }
 
     /**

src/main/java/net/lamgc/utils/event/EventHandlerObjectMap.java

@@ -24,7 +24,8 @@ public interface EventHandlerObjectMap {
     /**
      * 删除指定的{@link EventHandler}
      * @param handler 要删除的Handler
+     * @return 如果删除后该EventHandler已空则返回false
      */
-    void removeHandlerObject(EventHandler handler);
+    boolean removeHandlerObject(EventHandler handler);
 
 }

src/main/java/net/lamgc/utils/event/HashHandlerObjectMap.java

@@ -22,7 +22,9 @@ public Set<EventHandler> getHandlerObject(Class<?> eventHandlerClass) {
     }
 
     @Override
-    public void removeHandlerObject(EventHandler handler) {
-        handlerMap.remove(handler.getClass());
+    public boolean removeHandlerObject(EventHandler handler) {
+        HashSet<EventHandler> eventHandlers = handlerMap.get(handler.getClass());
+        eventHandlers.remove(handler);
+        return !eventHandlers.isEmpty();
     }
 }