Java Utililty Methods Number Parse

List of utility methods to do Number Parse

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Description

The list of methods to do Number Parse are organized into topic(s).

Method

NumbertoNumber(CharSequence jsonText)
To number 
Number value = null;
if (value == null)
    try {
        value = Integer.parseInt(jsonText.toString());
    } catch (NumberFormatException e) {
if (value == null)
    try {
...
NumbertoNumber(final Object obj)
to Number 
try {
    if (obj instanceof String) {
        return Double.valueOf((String) obj);
    } else if (obj instanceof Number) {
        return (Number) obj;
    } else {
        throw new IllegalArgumentException("Could not convert value to number: " + obj);
} catch (Exception e) {
    throw new IllegalArgumentException("Could not convert value to number: " + obj, e);
NumbertoNumber(Object object, Number defaultValue)
Extract the value represented by the given object (Number or String) - trialing '.0*' will be removed. 
if (object == null) {
    return defaultValue;
if (object instanceof Number) {
    return (Number) object;
String s = object.toString();
s = s.replaceAll("\\.0*$", ""); 
...
NumbertoNumber(Object object, Number defaultValue)
to Number 
if (object == null) {
    return defaultValue;
if (object instanceof Number) {
    return (Number) object;
String s = object.toString();
s = s.replaceAll("\\.0*$", "");
...
LongtoNumber(String hash)
Decodes the String provided which should represent a hexadecimal number into a Long . 
return (hash == null) ? null : Long.decode("0x" + hash);
NumbertoNumber(String num)
to Number 
if (num == null || num.length() < 1)
    return null;
if (num.contains(".")) {
    return Double.parseDouble(num);
} else {
    return Integer.parseInt(num);
inttoNumber(String s)
to Number 
return Integer.valueOf(s);
StringtoNumber(String string)
to Number 
char[] stringArray = string.toCharArray();
StringBuilder number = new StringBuilder();
for (char ch : stringArray) {
    if (ch >= '0' && ch <= '9') {
        number.append(ch);
return number.toString();
...
NumbertoNumber(String text)
Parses a JSON formatted number from text. 
if (text == null) {
    return null;
boolean fp = false;
for (char c : text.toCharArray()) {
    if (c == '.' || c == 'e' || c == 'E') {
        fp = true;
        break;
...
inttoNumber(String value, int defValue)
Convenience method for converting a String into an Integer. 
if (value != null) {
    try {
        return Integer.parseInt(value);
    } catch (NumberFormatException e) {
return defValue;