How To Compute Average True Range (ATR) using Java?

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public class ATRCalculator {

    public static double calculateATR(double[] high, double[] low, double[] close, int period) {
        double[] ATR = new double[close.length];
        ATR[0] = high[0] - low[0];
        
        for (int i = 1; i < close.length; i++) {
            double tr1 = high[i] - low[i];
            double tr2 = Math.abs(high[i] - close[i - 1]);
            double tr3 = Math.abs(low[i] - close[i - 1]);
            
            double trueRange = Math.max(tr1, Math.max(tr2, tr3));
            ATR[i] = ((ATR[i - 1] * (period - 1)) + trueRange) / period;
        }
        
        return ATR[close.length - 1];
    }

    public static void main(String[] args) {
        double[] high = {10, 12, 15, 13, 18};
        double[] low = {5, 7, 10, 8, 12};
        double[] close = {8, 9, 12, 11, 16};
        int period = 4;

        double atr = calculateATR(high, low, close, period);
        System.out.println("Average True Range (ATR): " + atr);
    }
}

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TR = max(high - low, |high - previous close|, |low - previous close|)