How do I display this in java?

1/2 1/2+2/3 1/2+2/3+3/4 1/2+2/3+3/4+4/5+5/6 I need to display this in java and store the sum of each of those new lines so that I can return it as a double. I would need to use two for loops. It also accepts a parameter of n. I was also given the equation n(n+1). I see how the equation works but I don't... show more 1/2

1/2+2/3

1/2+2/3+3/4

1/2+2/3+3/4+4/5+5/6

I need to display this in java and store the sum of each of those new lines so that I can return it as a double. I would need to use two for loops. It also accepts a parameter of n. I was also given the equation n(n+1). I see how the equation works but I don't know how to make it appear like the example above.

Here is my code:
public static double fractionSum(int n)
{
if (n < 1) {
return -1;
}

double sum;
int calc = n+1;

for (int i = 1; i <= n; i++) {
sum = n/(n+1);

for (int j = 0; j < i; j++) {
System.out.print(n+"/"+calc);
}

System.out.println(" ");
}
return 0;
}
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