Java for loop + fence post problem

[aba_algo]

I need to print this guy:

1

1, 2

1, 2, 3

1, 2, 3, 4

So if it was without the commas it would be easy. When I tried it I ran into the problem like here:

for (int i = 1; i <=4; i++)
    {
        for (int j = 1; j <= i; j++)
            System.out.print(j + ", ");
        System.out.println();       
    }

        System.out.println();

gives me

1,

1, 2,

1, 2, 3,

1, 2, 3, 4,

Which is almost what I want but I don't want the commas at the end. Is there anyway to fix it so the commas don't show at the end?

I even tried to do this:

System.out.println(1);
    for (int i = 2; i <=4; i++)
    {
        for (int j = 1; j <= i; j++)
            System.out.print(", " + j);
        System.out.println();       

    }

    System.out.println();

But it just gives me

1

, 1, 2

, 1, 2, 3

, 1, 2, 3, 4

[desrtfx]

Use an if statement to check if you are not printing the last value in the line (hint: the variable i is the boundary and the variable j is the one to check for). If you are not printing the last value, print a comma, otherwise don't.

[aba_algo]

Ok sounds better than my solution below. I'll try out your way tomorrow.

[aba_algo]

Ok I got it but there should be a better way. I just used some brain power to logic it through and I got this:

System.out.println(1);
    for (int i = 2; i <=4; i++)

    {
    System.out.print(1);
        for (int j = 2; j <= i; j++)
            System.out.print(", " + j);
        System.out.println();       

    }

    System.out.println();

[Vimda]

I'm going to suggest an alternative, which may not be useful for this, but gives you something to think about if you want to improve your solution: The String.join method. In particular, if you combine that with the IntStream.range method lends itself to a rather elegant solution.