MemoryLeaksWithMapsWeakReference

MemoryLeaksWithMapsWeakReference

这是我的程序:

public class MemoryLeaksWithMapsWeakReference {

    private Map<MemoryLeaksWithMapsWeakReference, Integer> map = null;
    public MemoryLeaksWithMapsWeakReference() {
        map = new HashMap<MemoryLeaksWithMapsWeakReference, Integer>();
    }

    public static void main(String[] args) {

        MemoryLeaksWithMapsWeakReference m = new MemoryLeaksWithMapsWeakReference();
        while(true) {
            m.run();
        }
    }

    private void run() {

        MemoryLeaksWithMapsWeakReference mm = new MemoryLeaksWithMapsWeakReference();
        WeakReference<MemoryLeaksWithMapsWeakReference> ref = new WeakReference<MemoryLeaksWithMapsWeakReference>(mm);
        mm = null;
        map.put(ref.get(), 1);
        System.out.println(map.size());
    }
}


现在,如果某个对象为weakReferenced,则应该由垃圾收集器将其删除。但是,在上述情况下(插入地图),情况并非如此。有人可以说出为什么地图项(弱引用)没有被销毁吗?

最佳答案

ref.get()返回对您的对象的null或硬引用。因此,地图将不包含任何“弱”引用。

10-07 22:51