Handy methods for working with power of two values.

power_of_two.java

public int nextPowerOfTwo(int value) {
    return 1 << 32 - Integer.numberOfLeadingZeros(value - 1);
}

public int previousPowerOfTwo(int value) {
    return 1 << 31 - Integer.numberOfLeadingZeros(value);
}

public boolean isPowerOfTwo(int value) {
    return (value & -value) == value;
}