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**      * Returns the result of flipping the specified bit.      *      * <p>...

**
     * Returns the result of flipping the specified bit.
     *
     * <p>
     * A bit is the digit used in the binary number system. A bit
     * can have a value of zero or one (with no other value allowed).
     * Flipping a bit changes the value of the bit to the other value;
     * flipping a bit that is zero changes it to one, and flipping
     * a bit that is one changes it to zero.
     *
     * @param x a bit
     * @return the flipped value of x
     * @throws BadBitException
     *           if x is not a bit (has a value that is not zero and not one).
     */
   public static int flipBit(int x) {
        return 0;
   }

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Answer #1 
/**
 * Returns the result of flipping the specified bit.
 *
 * <p>
 * A bit is the digit used in the binary number system. A bit
 * can have a value of zero or one (with no other value allowed).
 * Flipping a bit changes the value of the bit to the other value;
 * flipping a bit that is zero changes it to one, and flipping
 * a bit that is one changes it to zero.
 *
 * @param x a bit
 * @return the flipped value of x
 * @throws BadBitException if x is not a bit (has a value that is not zero and not one).
 */
public static int flipBit(int x) {
    if (x == 0) {
        return 1;
    } else if (x == 1) {
        return 0;
    } else {
        throw new BadBitException();
    }
}
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