TwoSums code only returning [0,0]

I'm practicing coding questions and i'm not sure why my code isn't working (i know it's not written very efficiently:/ )

given an array and a target number, return the indices of two numbers in the array that add up to the target number. Example: nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9, return [0, 1]. (indices have to be diff)

class Solution {
public int[] twoSum(int[] nums, int target) {
    for (int i = 0; i < nums.length; i++)
    {
        if (nums[i] <= target)
        {
            for (int j = i; j < nums.length; j++)
            {
                System.out.print(nums[i]); 
                if (nums[i] + nums[j] == target)
                {
                    return new int[]{i, j};
                }
            }
        }

    }
    return new int[]{0,0};
}
}

Any help would be greatly appreciated!