fix memory leak

realDuYuanChao · realDuYuanChao · commit 37918aa27f9a · 2019-09-24T21:02:47.000+08:00
diff --git a/DataStructures/Lists/SinglyLinkedList.java b/DataStructures/Lists/SinglyLinkedList.java
@@ -61,7 +61,9 @@ public void deleteHead() {
             throw new RuntimeException("The list is empty!");
         }
 
+        Node destroy = head;
         head = head.next;
+        destroy = null;  // clear to let GC do its work
     }
 
     /**

Original file line number	Diff line number	Diff line change
`@@ -61,7 +61,9 @@ public void deleteHead() {`
`61`	`61`	`throw new RuntimeException("The list is empty!");`
`62`	`62`	`}`
`63`	`63`
	`64`	`+ Node destroy = head;`
`64`	`65`	`head = head.next;`
	`66`	`+ destroy = null; // clear to let GC do its work`
`65`	`67`	`}`
`66`	`68`
`67`	`69`	`/**`