LinkedList实现 - clear()

xhz

clear()


为了让GC更快可以回收放置的元素，需要将node之间的引用关系赋空。

1.     /**
   
2.      * Removes all of the elements from this list.
   
3.      * The list will be empty after this call returns.
   
4.      */
   
5.     public void clear() {
   
6.         // Clearing all of the links between nodes is "unnecessary", but:
   
7.         // - helps a generational GC if the discarded nodes inhabit
   
8.         //   more than one generation
   
9.         // - is sure to free memory even if there is a reachable Iterator
   
10.         for (Node<E> x = first; x != null; ) {
    
11.             Node<E> next = x.next;
    
12.             x.item = null;
    
13.             x.next = null;
    
14.             x.prev = null;
    
15.             x = next;
    
16.         }
    
17.         first = last = null;
    
18.         size = 0;
    
19.         modCount++;
    
20.     }

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原文链接：https://pdai.tech/md/java/collection/java-collection-LinkedList.html