如何编写java程序获取pid

import java.util.Optional;

public class GetPID {
    public static void main(String[] args) {
        // 获取当前进程的ProcessHandle实例
        ProcessHandle currentProcess = ProcessHandle.current();

        // 获取进程ID
        long pid = currentProcess.pid();

        System.out.println("当前进程的PID: " + pid);
    }
}