Check if Number Has Equal Digit Count and Digit Value LeetCode solution in Java

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class Solution {
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  public boolean digitCount(String num) {
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    int[] freqArr = new int[10]; // n = 10 given in constraints;
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    for (char ch : num.toCharArray()) {
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      freqArr[ch - '0']++;
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    }
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    for (int i = 0; i < num.length(); i++) {
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      int freq = num.charAt(i) - '0'; // freq of each indexValue;
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      freqArr[i] = freqArr[i] - freq;
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    }
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    for (int i = 0; i < 10; i++) {
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      if (freqArr[i] != 0) {
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        return false;
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      }
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    }
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    return true;
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  }
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}