...是Reference的子类，如SoftwareReference强引用：从根通过任意路径到达对象都不存在通过引用对象间接触及软引用（SoftReference）：不存在强引用的对象且通过软引用维持的对象引用弱引用（WeakReference）：不存在强引用且通过软引用对象维持对象的可触及性虚引...
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SoftReference or weak reference 软引用或弱引用
The heap object that had been referenced by the SoftReference is declared finalizable.
SoftReference 引用过的 heap 对象被声明为 finalizable 。
The SoftReference object's referent field is set to null, thereby making it not refer to the heap object any longer.
SoftReference对象的referent域被设置为null，从而使该对象不再引用heap对象。
The idea of a SoftReference is that you hold a reference to an object with the guarantee that all of your soft references will be cleared before the JVM reports an out-of-memory condition.
SoftReference的原理是：在保持对对象的引用时保证在JVM报告内存不足情况之前将清除所有的软引用。
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