Garbage collector and reference interaction.

垃圾收集器和引用交互。

How the garbage collector handles references?

垃圾收集器如何处理references ？

Output from the garbage collector, verbose: gc.

垃圾回收器的输出verbose： gc。

You can also invoke the JVM's garbage collector (GC).

还可以调用JVM的垃圾收集器(GC)。

Is the person a physicist or a garbage collector?

这个人是个物理学家，还是个捡破烂的？