public static int cpu(){
  int cpuUsage=JDK_SYSTEM_RESOURCES.cpu();
  if (cpuUsage < 0 && isLinux()) {
    cpuUsage=LINUX_SYSTEM_RESOURCES.cpu();
  }
  return cpuUsage;
}

public static int cpu ( ) { int cpuUsage = JDK_SYSTEM_RESOURCES . cpu ( ) ; if ( cpuUsage < 0 && isLinux ( ) ) { cpuUsage = LINUX_SYSTEM_RESOURCES . cpu ( ) ; } return cpuUsage ; }
get cpu load in percents ( 1 - 100 ) . return - 1 when fails getting cpu load .
