Java Utililty Methods Number Negate

Boolean negatedValue;
if (_value == null) {
    negatedValue = Boolean.TRUE;
} else {
    negatedValue = Boolean.valueOf(!_value.booleanValue());
return negatedValue;

if (bool == null) {
    return null;
return (bool ? Boolean.FALSE : Boolean.TRUE);

Negates the specified boolean.

If null is passed in, null will be returned.

 BooleanUtils.negate(Boolean.TRUE)  = Boolean.FALSE; BooleanUtils.negate(Boolean.FALSE) = Boolean.TRUE; BooleanUtils.negate(null)          = null; 

if (bool == null) {
    return null;
return (bool.booleanValue() ? Boolean.FALSE : Boolean.TRUE);

boolean[] neg = new boolean[posit.length];
for (int i = 0; i < posit.length; i++) {
    neg[i] = !posit[i];
return neg;

if (v.getClass() == String.class) {
    throw new IllegalArgumentException("Strings cannot be negated");
if (v instanceof Number) {
    Number nv = (Number) v;
    if (nv instanceof Double)
        return new Double(-nv.doubleValue());
    if (nv instanceof Long)
...

double[] n = new double[a.length];
for (int i = 0; i < a.length; i++) {
    n[i] = -a[i];
return n;

for (int i = output.length - 1; i >= 0; i--) {
    output[i] = -a[i];
return output;

double[] result = new double[values.length];
for (int i = 0; i < values.length; i++) {
    result[i] = -values[i];
return result;

if (bool == null) {
    return null;
return bool.booleanValue() ? Boolean.FALSE : Boolean.TRUE;

int[] negated = new int[ar.length];
for (int i = 0; i < ar.length; i++)
    negated[i] = -ar[i];
return negated;