Number of Good Pairs LeetCode solution in Java

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class Solution {
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  public int numIdenticalPairs(int[] nums) {
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    int len = nums.length;
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    int counter = 0;
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    for (int i = 0; i < len; i++) {
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      for (int j = i + 1; j < len; j++) {
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        if (nums[i] == nums[j]) {
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          counter++;
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        }
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      }
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    }
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    return counter;
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  }
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}