UpdateBits.java

public class UpdateBits {
	public static int update(int n, int m, int i, int j) {
		int max = ~0;
		int left = max << j+1;
		int right = ((1 << i) - 1);
		int mask = left | right;
		int n_cleared = n & mask;
		int m_shifted = m << i;
		
		return n_cleared | m_shifted;
	}

	 public static void main(String[] args) {
		System.out.println(update(128, 5, 2, 4));
	}
}