How can i pass an element of ArrayList to a function by reference

Question

In the following code how do i pass proc to execute function as a reference so that after the function is executed its value is updated

public Process executeProcess(Process proc)
    {
        int remain=proc.getRemainingTime();
        if(remain-timeQuantum<=0)
        {
            proc.setRemainingTime(0);
            proc.setStatus(2);//2 represents terminated
            proc.setFinishTime(time);
            time=time+remain;
        }
        else {
            proc.setBurstTime(remain-timeQuantum);
            time=time+timeQuantum;
            proc.setStatus(1);// 1 represents waiting
            }
        return proc;
    }
    public ArrayList<Process> FCFS()
    {
        Process running;
        procList.sort(Comparator.comparing(Process::getArrivalTime));
        for(Process proc:procList) {
        running=executeProcess(proc);

        }
        return procList;
    }