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jstatMonitors Java Virtual Machine (JVM) statistics. This command is experimental and unsupported.Synopsisjstat[generalOption|outputOptions vmid[inter... 阅读全文
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jpsLists the instrumented Java Virtual Machines (JVMs) on the target system. This command is experimental and unsupported.Synopsisjps[options] [hostid... 阅读全文
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jmcJava Mission Control is a Profiling, Monitoring, and Diagnostics Tools Suite.Synopsisjmc[options]Options, if used, should follow immediately after ... 阅读全文
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jconsoleStarts a graphical console that lets you monitor and manage Java applications.Synopsisjconsole[options] [ connection ... ]optionsThe command-l... 阅读全文
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jcmdSends diagnostic command requests to a running Java Virtual Machine (JVM).Synopsisjcmd[-l|-h|-help]jcmdpid|main-classPerfCounter.printjcmdpid|main... 阅读全文
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最近在网上看到一些人讨论到java.lang.Runtime类中的freeMemory(),totalMemory(),maxMemory ()这几个方法的一些问题,很多人感到很疑惑,为什么,在java程序刚刚启动起来的时候freeMemory()这个方法返回的只有一两兆字节,而随着 java程序往... 阅读全文