// time_cpu.java  check measuring CPU process time

import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;

public class time_cpu
{
  double now;
  double next;

  time_cpu()
  {
    System.out.println("time_cpu starting");
    System.out.println("Should be CPU time, 5 second intervals");
    ThreadMXBean tb = ManagementFactory.getThreadMXBean();

    now  = tb.getCurrentThreadCpuTime()/1.0E9;
    next = now+5.0;

    for(int i=0; i<90;)
    {
      now = tb.getCurrentThreadCpuTime()/1.0E9;
      if(now >= next) 
      {
        System.out.println(i);
        i=i+5;
        next=next+5.0;
      }    
    } 
  } // end time_cpu constructor
  
  static public void main(String[] args)
  {
    new time_cpu();
  } // end main
} // end class time_cpu