int cannot be dereferrenced

Code :

---

Process scheduledProcess;
 
 
private void assignNextProcess(){
 
            if (queue1.size() != 0){
 
                scheduledProcess.add(Scheduler.SRTF.getNext(queue1));
 
                if (scheduledProcess.getBurstTime(0) == scheduledProcess.getTimeRemaining(0)){
                    scheduledProcess.getResponseTime(0).add(time.remove(scheduledProcess.getArrivalTime(0)));
                }
 
                queue1.remove(scheduledProcess);
 
                String msg = "Assigned Process " + scheduledProcess.getProcessNumber(0) + " to CPU";
            }
 
            else if (queue2.size() != 0){
 
                scheduledProcess = Scheduler.NPP.getNext(queue2);
 
                if (scheduledProcess.getBurstTime(0)==(scheduledProcess.getTimeRemaining(0))){
                    scheduledProcess.getResponseTime(0).add(time.remove(scheduledProcess.getArrivalTime(0)));
                }
 
                queue2.remove(scheduledProcess);
 
                String msg = "Assigned Process " + scheduledProcess.getProcessNumber(0) + " to CPU";
            }
 
            else if (queue3.size() != 0){
 
                scheduledProcess.add(Scheduler.FCFS.getNext(queue3));
 
                if (scheduledProcess.getBurstTime(0)==(scheduledProcess.getTimeRemaining(0))){
                    scheduledProcess.getResponseTime(0).add(time.remove(scheduledProcess.getArrivalTime(0)));
                }
 
                queue3.remove(scheduledProcess);
 
                String msg = "Assigned P" + scheduledProcess.getProcessNumber(0) + " to CPU";
            }
        }
 
public class Process(){
   public int getBurstTime(int BurstTime) {
   		 return BurstTime;
   }
   public int getArrivalTime(int ArrivalTime) {
   	 	 return ArrivalTime;
   }
   public int getProcessNumber(int ProcessNumber) {
   		 return ProcessNumber;
   }
   public int getTimeRemaining(int TimeRemaining){
   		 return TimeRemaining;
   }
}

---

when i run this file, there's an error in the lines, and the other lines in the if statements, like this if statement, it has an error.

if (scheduledProcess.getBurstTime(0) == scheduledProcess.getTimeRemaining(0)){
scheduledProcess.getResponseTime(0).add(time.remov e(scheduledProcess.getArrivalTime(0)));
}

the error is "int cannot be dereferrenced" and its pointing out to the code in this if statement. what should I change in this code?

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I'm going to take a guess and say that scheduledProcess.getResponseTime(0) returns a primitive int, and you are trying to do something like 0.add() to it, which doesn't work because primitives don't have methods. Try using += instead of add().