Java Utililty Methods Double Parse

Double tryParseDouble(Object o)
Given an Object that may be null or may be a float or double, this method attempts to convert the value to a Double.

if (o == null)
 return null;
Double retVal = null;
try {
 retVal = Double.parseDouble(o.toString().trim());
} catch (NumberFormatException nfe) {
return retVal;
...

Double tryParseDouble(Object obj, Double defaultVal)
try Parse Double

if (obj == null)
 return defaultVal;
if (obj instanceof Double)
 return (Double) obj;
try {
 String val = obj.toString();
 return Double.parseDouble(val);
} catch (Exception e) {
...

Object tryParseDouble(String doubleValue)
try Parse Double

Object parsedValue;
try {
 parsedValue = Double.parseDouble(doubleValue);
} catch (NumberFormatException nfe) {
 parsedValue = doubleValue;
return parsedValue;

Double tryParseDouble(String value)
Try to parse the string as double or return null if failed

try {
 return Double.parseDouble(value);
} catch (NumberFormatException e) {
 return null;

double tryParseDouble(String value)
try Parse Double

try {
 return Double.parseDouble(value);
} catch (NumberFormatException e) {
 return -1;