Avoid printing the last comma

Question

I\'m trying to print this loop without the last comma. I\'ve been Googling about this and from what i\'ve seen everything seems overcomplex for such a small problem. Surely

Answer 1

Yet another way to do this.

String sep = "";
for(int i = a; i <= b; i++) {
    System.out.print(sep + i);
    sep = ",";
}

if you are using a StringBuilder

StringBuilder sb = new StringBuilder();
for(int i = a; i <= b; i++)
    sb.append(i).append(',');
System.out.println(sb.subString(0, sb.length()-1));

Answer 2

Java 8:

IntStream.rangeClosed(a, b)
         .collect(Collectors.joining(","));

---

If you want to perform interleaving actions:

Java 8:

IntStream.rangeClosed(a, b)
         .peek(System.out::print)
         .limit(b - a) // [a:(b-1)]
         .forEach(i -> System.out.print(","));

Java 9:

IntStream.rangeClosed(a, b)
         .peek(System.out::print)
         .takeWhile(i -> i < b) // [a:(b-1)]
         .forEach(i -> System.out.print(","));

Answer 3

public static void atob (int a,int b){
 for(int i = a; i <= b; i++) 
        {
            System.out.print(i );
            if(i<b){
                System.out.print(",");
            }
        }
}

Answer 4

With slight adjustments (method name, variables, and space after comma):

public static void printSequence(int start, int end) {
  if (end < start) {
    return; // or however you want to handle this case
  }
  if (end == start) {
    System.out.print(start);
    return;
  }
  StringBuilder sequence = new StringBuilder();
  for (int i = start; i <= end; i++) {
    sequence.append(i).append(", ");
  }
  // now simply print the sequence without the last ", "
  System.out.print(sequence.substring(0, sequence.length() - 2));
}

Answer 5

public static void atob(int a, int b) {
    if (a < b) {
        System.out.print(a);
        while (a < b) {
            a++;
            System.out.print("," + a);
        }
    }
}

When called with

atob(0,10);

Will give the output

0,1,2,3,4,5,6,7,8,9,10

Answer 6

Try:

public static void atob(int a, int b) {
    if (b < a) {
        final int temp = a;
        a = b;
        b = temp;
    } 
    System.out.print(a++);

    for (int i = a; i < b ; i ++ ) {
        System.out.print("," + i);
    }
}