100644 blob 63ba175ffb9ae3739ad80a8718b1080964ef6ae9	PhantomReference.java
100644 blob bb5e250e2e90e0caed474e45b2005f6657972ae2	Reference.java
100644 blob 88aa7b19e1955935e2ab856def1e926818be63d2	SoftReference.java
100644 blob 4b777b0486402687878b2a9949296910fe362671	WeakReference.java