?? recursivepowercalculator.java
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package com.wrox.algorithms.iteration;/** * A {@link PowerCalculator} that uses recursion. * */public final class RecursivePowerCalculator implements PowerCalculator { /** The single, publicly accessible, instance of the comparator. */ public static final RecursivePowerCalculator INSTANCE = new RecursivePowerCalculator(); /** * Constructor marked private to prevent instantiation. */ private RecursivePowerCalculator() { } public int calculate(int base, int exponent) { assert exponent >= 0 : "exponent can't be < 0"; return exponent > 0 ? base * calculate(base, exponent - 1) : 1; }}
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