java - How do I exit my program without using return and System.exit()? -

so code :-

import java.io.*; class railways {     bufferedreader br=new bufferedreader (new inputstreamreader(system.in));     void main () throws ioexception     {         system.out.print("\f");         system.out.println("welcome irctc railway reservation system! please proceed further     book train!");     system.out.println();     string[] trainname = {"rajdhani exp", "aug kranti exp", "chennai exp", "aravali exp", "paschim exp", "gareeb rath", "punjab mail", "dehradun exp", "swaraj exp", "aravali exp"};     int[] trainno = {57835, 87612, 15384, 16512, 65265, 51654, 31543, 56416, 85484, 78455};     string[] origin = {"mumbai", "mumbai", "delhi", "kolkata", "mumbai", "goa", "durg", "aligarh", "jaipur", "bhuj"};     string[] destination = {"surat", "delhi", "chennai", "mumbai", "ajmer", "mumbai", "bikaner", "agra", "madurai", "buxar"};     int[] fare = {650, 950, 1100, 1200, 1050, 600, 1100, 1250, 1300, 1100};     int[] lengths = {trainname.length, trainno.length, origin.length, destination.length, fare.length};     string[] sd = new string[3];     int in[] = new int[3];     system.out.println("train name\t\ttrain no.\torigin\t        destination\tfare");     system.out.println();     (int i=0;i<lengths[0];i++)     {         system.out.println(trainname[i]+"\t\t"+trainno[i]+"\t\t"+origin[i]+"\t\t"+destination[i]+"\t\t"+fare[i]);      }     system.out.println();     system.out.print("enter train no. select train or enter 1 exit :- ");     in[0] = integer.parseint (br.readline());     if (in[0]==1)     {         system.out.print("thanks visiting our website!");         return;     }     else     {          (int j=0;j<lengths[0];j++)          {              if (trainno[j]==in[0])              {                  sd[0] = trainname[j];                  sd[1] = origin[j];                  sd[2] = destination[j];                  in[1] = fare[j];              }          }     }     if (in[1]==0)     {         system.out.print("wrong input! try again....");         return;     }     system.out.print("enter number of passengers (max 5) :- ");     in[2] = integer.parseint (br.readline());      if (in[2]>5)     {         system.out.print("uh-oh! no. of passengers more 5, please try again");         return;     }     string[] pn = new string[in[2]];     (int k=0;k<in[2];k++)     {         system.out.print("enter passenger's name :- ");         pn[k] = br.readline();     }     system.out.println();     system.out.println("booking details :-");     system.out.println();     system.out.println("no. of passengers :- "+in[2]);     (int z=0;z<in[2];z++)     {         system.out.println("name of passenger travelling :- "+pn[z]);     }     system.out.println("train name :- "+sd[0]);     system.out.println("train number :- "+in[0]);     system.out.println("train origin :- "+sd[1]);     system.out.println("train destination :- "+sd[2]);     system.out.println("train fare/person :- "+in[1]);     system.out.println("total fare :- "+in[2]*in[1]);     system.out.println();     system.out.println("thanks booking! seats have been confirmed. have day!"); } } 

as can see have used return many times here teacher 1 big pain , says can't use return or system.exit(0) :p need terminate program in if statements cat use return or system.exit(0) :p have heard possible while or do-while loop can't understand how...

help appreciated :p

you have used 'if' conditions return error messages , processing positive scenarios if system doesn't satisfy 'if' conditions. replace giving 'if' condition valid scenarios , using 'else' condition after return error messages. way won't have explicitly return.

e.g : last part of ur program written :

if (in[2]<=5)     {      string[] pn = new string[in[2]];     (int k=0;k<in[2];k++)     {         system.out.print("enter passenger's name :- ");         pn[k] = br.readline();     }     system.out.println();     system.out.println("booking details :-");     system.out.println();     system.out.println("no. of passengers :- "+in[2]);     (int z=0;z<in[2];z++)     {         system.out.println("name of passenger travelling :- "+pn[z]);     }     system.out.println("train name :- "+sd[0]);     system.out.println("train number :- "+in[0]);     system.out.println("train origin :- "+sd[1]);     system.out.println("train destination :- "+sd[2]);     system.out.println("train fare/person :- "+in[1]);     system.out.println("total fare :- "+in[2]*in[1]);     system.out.println();     system.out.println("thanks booking! seats have been confirmed. have day!"); } else{ system.out.print("uh-oh! no. of passengers more 5, please try again");      }