引用类型 | 例子 | 用途 | 生存时间 |
---|---|---|---|
强引用 | Object obj=new Object(); | 对象的一般状态 | GC ROOT 可达,永远不会回收 |
软引用 | SoftReference | 对象缓存 | OOM 之前回收 |
弱引用 | WeakReference | 对象缓存 | GC 之后,访问不到 |
虚引用 | PhantomReference | 跟踪对象的垃圾回收 | 未知 |
当前对象没有强引用,只有 软、弱、虚的时候,才会生效。
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