Question

Im a beginner in java and starting to do test driven development. I have a pretty basic scenario i am stuck with. I want to pass a string of numbers from 1 to x. i.e if x is 3, it will return “1, 2, 3” or if x is 5, it will return “1, 2, 3, 4, 5”.

I know that i need to use an array list and a for loop but am stuck with the syntax. Someone please help!

Thanks

Answer 1

Try the following code:

int x = 5;

StringBuilder sb = new StringBuilder(); //You need import java.util.StringBuilder

for (int i = 1; i <= 5; i++) {
    sb.append(i);
    if (i!=x) {
        sb.append(',');
    }
}

String result = sb.toString(); //Here will be "1,2,3,4,5"