如何在Java 9的JShell中打印pid，信息，子项和销毁进程？
JShell 是一种JavaShell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，并在命令行提示符下显示结果。
Java改进了ProcessAPI，以管理和控制操作系统进程。ProcessHandle 接口标识并提供对本机进程，检查进程 活动性和破坏 进程的方法的控制。ProcessHandle.Info接口提供流程的信息快照 。
在下面的代码片段，我们可以打印PID，信息，孩子， 和破坏 的过程流程 API。在JShell 工具。
片段
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[Nhooo\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[Nhooo\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)