Largest Number LeetCode solution in Java

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class Solution {
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  public String largestNumber(int[] nums) {
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    String[] arr = new String[nums.length];
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    for (int i = 0; i < nums.length; i++) {
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      arr[i] = Integer.toString(nums[i]);
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    }
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    Arrays.sort(arr, (a, b) -> (b + a).compareTo(a + b));
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    if (arr[0].equals("0")) return "0";
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    StringBuilder builder = new StringBuilder();
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    for (String item : arr) {
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      builder.append(item);
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    }
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    return builder.toString();
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  }
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}