i have a java code that is about cpu priority with round robin $,$ the code is complete and correct except for one part which is the gantt chart output.

i will provide you the code and the sample input and the sample output so please update what is neccesary in my code $.$

my input

Please enter Quantum time: $3$

Please enter in this order: process ID$,$ arrival time, burst time, and priority $($to execute enter $0000)$:

$1035$

$2186$

$3341$

$4252$

$0000$

the gantt chart output i get : Gantt Chart: $0$ P$1-0$ P$3-3$ P$3-6$ P$4-7$ P$4-10$ P$2-12$ P$2-15$ P$2-$

the correct gantt chart is this : Gantt Chart: $0-$P$1-3-$P$3-6-$P$3-7-$P$3-7-4-10-$P$4-12-$P$4-12-$P$2-15-$P$2-18-$P$2-20$

my java code :

$//$ begin of code

import java.util.$*$;

$//$define variables

class ProcessDetails

$\{$

int pID; int bTime; int aTime; int pri; int remTime; int wTime; int tTime; int resTime;

boolean done; boolean start;

$//$start the variables

public ProcessDetails$($int pid, int aTime, int bTime, int priority$)$

$\{$

this.pID $=$ pid;

this.aTime $=$ aTime;

this.bTime $=$ bTime;

this.pri $=$ priority;

this.remTime $=$ bTime;

$//$defaults values

this.wTime $=0$;

this.tTime $=0$;

this.resTime $=-1$;

this.done $=$ false;

this.start $=$ true;

$\}$

$//$get methods for the id and priority

public int getPri$()\{$

return this.pri;

$\}$

public int getpID$()\{$

return this.pID;

$\}$

$\}$

public class PRR $\{$

public static void main$($String$[]$ args$)\{$

$//$start scanner for input

Scanner kbd $=$ new Scanner$($System$.$in$)$;

System.out.print$("$Please enter Quantum time:"$)$;

int q $=$ kbd$.$nextInt$()$; $//$quantum value saved here

$//$create new list for the process details $($arrival time $/...)$

List processsos $=$ new ArrayList$<>()$;

$//$output and form

System.out.println$("$Please enter in this order: process ID$,$ arrival time, burst time, and priority $($to execute enter $0000)$:$")$;

while $($true$)\{$

int ID $=$ kbd$.$nextInt$()$;

int arrivalTime $=$ kbd$.$nextInt$()$;

int burstTime $=$ kbd$.$nextInt$()$;

int priority $=$ kbd$.$nextInt$()$;

$//$ condition $0000$ to execute$/$terminate

if $($ID $==0$ && arrivalTime $==0$ && burstTime $==0$ && priority $==0)\{$

break;

$\}$

$//$ add the inputs to the new list

processsos.add$($new ProcessDetails$($ID$,$ arrivalTime, burstTime, priority$))$;

$\}$

kbd$.$close$()$; $//$ Close the scanner to avoid resource leaks

$//$ organize the processes compared to thier arrival times

Collections.sort$($processsos$,$ Comparator.comparingInt$($p $->$ p$.$aTime$))$;

$//$new variables$/$defaults

int cTime $=0$; int processDone $=0$; int total$\_$wTime $=0$; int total$\_$tTime $=0$; int total$\_$resTime $=0$;

$//////////////////////////////////////////////////////////////////////////////////////$

StringBuilder GanttChart $=$ new StringBuilder$()$;

int preTime $=0$;

while $($processDone $<$ processsos.size$())\{$

ProcessDetails cur $=$ pickNextProcess$($processsos$,$ cTime$)$;

$//$calculate response time

if $($cur $!=$ null$)\{$

if $($cur$.$start$)\{$

cur.resTime $=$ cTime $-$ cur.aTime;

cur.start $=$ false;

$\}$

$//$draw the gantt chart

GanttChart.append$($preTime$).$append$("$ P$").$append$($cur$.$pID$).$append$("-")$;

preTime$=$cTime;

int timeSlice $=$ Math.min$($q$,$ cur.remTime$)$;

cTime $+=$ timeSlice;

cur.remTime $-=$ timeSlice;

$//$ calculate turnaround,wait times $/$ add them to the prev value $[$total$]$

if $($cur$.$remTime $==0)$

$\{$

cur.done $=$ true;

processDone$++$;

cur.tTime $=$ cTime $-$ cur.aTime;

cur.wTime $=$ cur.tTime $-$ cur.bTime;

total$\_$wTime $+=$ cur.wTime;

total$\_$tTime $+=$ cur.tTime;

total$\_$resTime $+=$ cur.resTime;

$\}$

$\}$ else $\{$

cTime$++$; $//$because there is no process active right now so so add $1$ to go next

preTime$=$cTime;

$\}$

$\}$

$//$helpful message for the user

System.out.println$("$

Schedule Successfully done."$)$;

$//$print the gantt chart

System.out.println$("$Gantt Chart: $"+$ GanttChart.toString$().$trim$())$;

$//////////////////////////////////////////////////////////////////////////////////////$

$//$print the process details

for $($ProcessDetails p : processsos$)\{$

System.out.println$("$

$-------------------------"+$

$"$

Process ID: $["+$ p$.$pID $+"]"+"$

The Turnaround Time: $"+$ p$.$tTime $+"$

The Waiting Time: $"+$ p$.$wTime $+"$

The Response Time: $"+$ p$.$resTime $+"$

$")$;

$\}$

$//$print the averages