獲取線程信息

// 獲取 Java 線程管理 MXBean
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
// 不需要獲取同步的 monitor 和 synchronizer 信息，僅獲取線程和線程堆棧信息
ThreadInfo[] threadInfos = threadMXBean.dumpAllThreads(false, false);
// 遍歷線程信息，僅打印線程 ID 和線程名稱信息
for (ThreadInfo threadInfo : threadInfos) {
    System.out.println("[" + threadInfo.getThreadId() + "] " +
            threadInfo.getThreadName());
}

console

[5] Monitor Ctrl-Break
[4] Signal Dispatcher
[3] Finalizer
[2] Reference Handler
[1] main

Java版本

java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)