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How to Implement a Power Function in Java - Coding Interview Problems

Even though the Java library has a power function, Math.pow() to calculate the power of a given number in Java, it's a common programming exercise for Java programmer to implement a power function. If you have used the Math class then you know that the java.lang.Math.pow(double a, double b) returns the value of the first number raised to the power of the second number and you need to do the same. In other words, you need to write a Java function to calculate the power of integer numbers for simplicity. The original method accepts a double value but you are allowed to use just integer but beware that power function may overflow.