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

booleanisNumber(final String str)
Checks whether the provided string is a number. 
if (isNullOrEmpty(str)) 
    return false;
final NumberFormat formatter = NumberFormat.getInstance();
final ParsePosition pos = new ParsePosition(0);
formatter.parse(str, pos);
return str.length() == pos.getIndex();
booleanisNumber(String str)
This method is used to check if the String passed is a number/integer only. 
NumberFormat formatter = NumberFormat.getInstance();
ParsePosition pos = new ParsePosition(0);
formatter.parse(str, pos);
return str.length() == pos.getIndex();
booleanisNumeric(Class cls)
is Numeric 
if (cls != null) {
    return cls == int.class || cls == long.class || cls == float.class || cls == double.class
            || Number.class.isAssignableFrom(cls);
return false;
booleanisNumeric(final String str)
is Numeric 
final NumberFormat formatter = NumberFormat.getInstance();
final ParsePosition pos = new ParsePosition(0);
formatter.parse(str, pos);
return str.length() == pos.getIndex();
booleanisNumeric(String str)
Works out of a string could be parsed a Number 
boolean isnumeric = false;
try {
    NumberFormat formatter = NumberFormat.getInstance();
    ParsePosition pos = new ParsePosition(0);
    formatter.parse(str, pos);
    isnumeric = (str.length() == pos.getIndex() ? true : false);
} catch (Exception e) {
    isnumeric = false;
...
booleanisNumeric(String str)
Returns true if the given string represents a parseable numeric value, either integer or floating point. 
NumberFormat fmt = NumberFormat.getInstance();
ParsePosition pos = new ParsePosition(0);
fmt.parse(str, pos);
return str.length() == pos.getIndex();
booleanisNumeric(String str)
is Numeric 
try {
    NUMFORMATTER.get().parse(str);
} catch (Exception e) {
    return false;
return true;
booleanisNumeric(String value, Locale locale)
Test, if a string contains a parsable number. 
if (value == null)
    return false;
int start = 0;
final DecimalFormatSymbols symbols = (locale != null) ? DecimalFormatSymbols.getInstance(locale)
        : DecimalFormatSymbols.getInstance();
if (value.startsWith("+") || value.startsWith("-"))
    start++;
boolean fraction = false;
...
booleanisParsable(Object parser, String str)
is Parsable 
Class theClass = (parser instanceof Class ? (Class) parser : parser.getClass());
boolean staticOnly = (parser == theClass), foundAtLeastOne = false;
Method[] methods = theClass.getMethods();
for (int index = 0; index < methods.length; index++) {
    Method method = methods[index];
    if (method.getName().startsWith("parse") && (!staticOnly || Modifier.isStatic(method.getModifiers()))
            && Modifier.isPublic(method.getModifiers()) && method.getGenericParameterTypes().length == 1
            && method.getGenericParameterTypes()[0] == String.class) {
...
inttoNumber(char letter)
to Number 
switch (letter) {
case ' ':
    return 0;
case 'a':
    return 1;
case 'b':
    return 2;
case 'c':
...