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Release： 2016-06-24 11:29:33
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Java引用和gc.mdown—/Users/wjk/Desktop/笔记

强引用

强引用是我们接触最多的引用，若果是强引用JVM宁愿抛出OOM也不愿回收具有强引用的对象。
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软引用

具有软引用的对象，内存空间充足的时候，垃圾回收器不会回收，当内存空间不充足的时候，垃圾回收器回收。
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弱引用

在垃圾回收器线程扫描它所管辖的内存区域的过程中，一旦发现了只具有弱引用的对象，不管当前内存空间足够与否，都会回收它的内存。
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虚引用

虚引用主要用来跟踪对象被垃圾回收器回收的活动。虚引用与软引用和弱引用的一个区别在于：虚引用必须和引用队列 （ReferenceQueue）联合使用。当垃圾回收器准备回收一个对象时，如果发现它还有虚引用，就会在回收对象的内存之前，把这个虚引用加入到与之关联的引用队列中。
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引用队列

软引用、弱引用可以和一个引用队列（ReferenceQueue）联合使用，如果软引用所引用的对象被垃圾回收器回收，Java虚拟机就会把这个软引用加入到与之关联的引用队列中。
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