Number of Recent Calls LeetCode solution in Java

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class RecentCounter {
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  ArrayList<Integer> calls;
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  public RecentCounter() {
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    calls = new ArrayList<Integer>();
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  }
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  public int ping(int t) {
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    calls.add(t);
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    int count = 0;
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    for (Integer call : calls) {
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      if (t - call <= 3000) count++;
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    }
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    return count;
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  }
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}
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/**
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 * Your RecentCounter object will be instantiated and called as such: RecentCounter obj = new
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 * RecentCounter(); int param_1 = obj.ping(t);
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 */