How to print pid, info, children and destroy process in JShell of Java 9?

JShell是一个 Java Shell 工具，用于执行简单的 java 语句，例如类、方法、接口、枚举等。对其进行评估，并将结果打印在命令行提示符。

Java 改进了Process API来管理和控制操作系统进程。 ProcessHandle接口识别并提供对本机进程的控制、检查进程活动性和销毁进程的方法过程。 ProcessHandle.Info 接口提供进程的信息快照。

在下面的代码片段中，我们可以打印pid 进程API信息、子进程、和销毁进程/strong>.in JShell 工具。

代码片段

<strong>jshell> ProcessHandle currentProcess = ProcessHandle.current();
currentProcess ==> 3960

jshell> System.out.println("Current Process Id: = " + currentProcess.pid());
Current Process Id: = 3960

jshell> currentProcess.info();
$3 ==> [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Java\jdk-9.0.4\bin\java.exe, startTime: Optional[2020-05-03T06:43:37.510Z], totalTime: Optional[PT1.265625S]]

jshell> currentProcess.pid();
$4 ==> 3960

jshell> ProcessHandle.of(3960)
$5 ==> Optional[3960]

jshell> $5.get()
$6 ==> 3960

jshell> $6.info()
$7 ==> [user: Optional[Tutorialspoint\User], cmd: C:\Program Files\Java\jdk-9.0.4\bin\java.exe, startTime: Optional[2020-05-03T06:43:37.510Z], totalTime: Optional[PT1.390625S]]

jshell> Stream<ProcessHandle> childProc = ProcessHandle.current().children();
childProc ==> java.util.stream.ReferencePipeline$2@6895a785

jshell> childProc.count()
$10 ==> 1

jshell> childProc.forEach(procHandle -> { System.out.println(procHandle.destroy() ? "Could not kill process " + procHandle.pid() : "Terminated " + procHandle.pid()); });

|   java.lang.IllegalStateException thrown: stream has already been operated upon or closed
|      at AbstractPipeline.evaluate (AbstractPipeline.java:229)
|      at ReferencePipeline.forEach (ReferencePipeline.java:430)
|      at (#11:1)</strong>

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