SPOS - Shortest Job First [SJF] Program

import java.util.Arrays;

import java.util.Comparator;

import java.util.Scanner;

public class SJFScheduling {

 public static int[] waitingTimeSJF(int[] burstTimes) {

 int[] waitingTimes = new int[burstTimes.length];

 for (int i = 0; i < burstTimes.length; i++) {

 if (i == 0) {

 waitingTimes[i] = 0;

 continue;

 }

 waitingTimes[i] = waitingTimes[i-1] + burstTimes[i-1];

 }

 return waitingTimes;

 }

 public static int[] turnAroundTimeSJF(int[] burstTimes, int[] waitingTimes) {

 int[] turnAroundTimes = new int[burstTimes.length];

 for (int i = 0; i < burstTimes.length; i++) {

 turnAroundTimes[i] = waitingTimes[i] + burstTimes[i];

 }

 return turnAroundTimes;

 }

 public static float averageWaitingTime(int[] waitingTimes) {

 int totalSum = 0;

 for (int waitingTime : waitingTimes) {

 totalSum += waitingTime;

 }

 return (float) totalSum/waitingTimes.length;

 }

 public static int[][] sortProcesses(int[] processIDs, int[] burstTimes) {

 int [][]arr = new int[burstTimes.length][2];

 for (int i = 0; i < burstTimes.length; i++) {

 arr[i][0] = processIDs[i];

 arr[i][1] = burstTimes[i];

 }

 Arrays.sort(arr, Comparator.comparingInt(o -> o[1]));

 return arr;

 }

 public static void main(String[] args) {

 Scanner myScanner = new Scanner(System.in);

 System.out.print("Enter total number of processes: ");

 int totalNumProcesses = myScanner.nextInt();

 int[] processIds = new int[totalNumProcesses];

 int[] burstTimes = new int[totalNumProcesses];

 for (int i = 0; i < totalNumProcesses; i++) {

 System.out.print("Enter Process id: ");

 processIds[i] = myScanner.nextInt();

 System.out.print("Enter Burst Time: ");

 burstTimes[i] = myScanner.nextInt();

 }

 int[][] arrays = sortProcesses(processIds, burstTimes);

 for (int i = 0; i < burstTimes.length; i++) {

 processIds[i] = arrays[i][0];

 burstTimes[i] = arrays[i][1];

 }

 int[] waitingTimes = waitingTimeSJF(burstTimes);

 int[] turnAroundTimes = turnAroundTimeSJF(burstTimes, waitingTimes);

 float avgWaitingTime = averageWaitingTime(waitingTimes);

 System.out.format("%4s%4s%4s%4s\n", "pid", "bt", "wt", "tat");

 for (int i = 0; i < totalNumProcesses; i++) {

 System.out.format("%4d%4d%4d%4d\n", processIds[i], burstTimes[i], waitingTimes[i],

turnAroundTimes[i]);

 }

 System.out.println("The average waiting time is: " + avgWaitingTime);

 }

}