Checking the number of power of 4

Power4.java

public class Power4 {
    public static void main(String[] args) {
        for (int i = 1; i < 30; i++) {
            if (isPower4(i))
                System.out.println(i + " is power of 4");
            else
                System.out.println(i + " is NOT power of 4");

        }
    }

    public static boolean isPower4(int value) {
        return isEnhancedPower2(value) && ((value - 1) % 3 == 0);
    }

    public static boolean isEnhancedPower2(int value) {
        return ((value & -value) == value);
    }

    public static boolean isEnhanced2Power2(int value) {
        return ((value & value - 1) == 0);
    }
}