默认情况下，我的JVM（1.6.0_26）产生更多线程。大多数都具有漂亮的描述性名称，以暗示其目的：
"Attach Listener" daemon prio=10 tid=0x0000000041426800 nid=0x2fb9 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE"Low Memory Detector" daemon prio=10 tid=0x00007f512c07e800 nid=0x2fa3 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE"C2 CompilerThread1" daemon prio=10 tid=0x00007f512c07b800 nid=0x2fa2 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE"C2 CompilerThread0" daemon prio=10 tid=0x00007f512c078800 nid=0x2fa1 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE"Signal Dispatcher" daemon prio=10 tid=0x00007f512c076800 nid=0x2fa0 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE"Finalizer" daemon prio=10 tid=0x00007f512c05a000 nid=0x2f9f in Object.wait() [0x00007f512b8f7000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000007c14b1300> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118) - locked <0x00000007c14b1300> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)"Reference Handler" daemon prio=10 tid=0x00007f512c058000 nid=0x2f9e in Object.wait() [0x00007f512b9f8000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000007c14b11d8> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:485) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116) - locked <0x00000007c14b11d8> (a java.lang.ref.Reference$Lock)"main" prio=10 tid=0x0000000041401800 nid=0x2f94 waiting on condition [0x00007f5135735000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at Main.main(Main.java:5)"VM Thread" prio=10 tid=0x00007f512c051800 nid=0x2f9d runnable"GC task thread#0 (ParallelGC)" prio=10 tid=0x0000000041414800 nid=0x2f95 runnable"GC task thread#1 (ParallelGC)" prio=10 tid=0x00007f512c001000 nid=0x2f96 runnable"GC task thread#2 (ParallelGC)" prio=10 tid=0x00007f512c002800 nid=0x2f97 runnable"GC task thread#3 (ParallelGC)" prio=10 tid=0x00007f512c004800 nid=0x2f98 runnable"GC task thread#4 (ParallelGC)" prio=10 tid=0x00007f512c006800 nid=0x2f99 runnable"GC task thread#5 (ParallelGC)" prio=10 tid=0x00007f512c008000 nid=0x2f9a runnable"GC task thread#6 (ParallelGC)" prio=10 tid=0x00007f512c00a000 nid=0x2f9b runnable"GC task thread#7 (ParallelGC)" prio=10 tid=0x00007f512c00c000 nid=0x2f9c runnable"VM Periodic Task Thread" prio=10 tid=0x00007f512c089000 nid=0x2fa4 waiting on condition
显然，大多数线程与内存处理有关：有8个垃圾收集器线程，外加低内存检测器。
Finalizer和
ReferenceHandler听起来像他们也参与了内存管理。
C2 CompilerThread0/1几乎可以肯定，它与即时编译有关。
至于其余线程的确切目的，我不确定。
