Java Utililty Methods Integer Create

List of utility methods to do Integer Create

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Description

The list of methods to do Integer Create are organized into topic(s).

Method

StringtoIntString(Object object)
to Int String 
if (object == null) {
    return null;
} else if (object instanceof Number) {
    return String.valueOf(((Number) object).intValue());
} else {
    return object.toString();
inttoIntUnsigned(short x)
to Int Unsigned 
return x & 0xFFFF;
inttoIntValue(char ch)
to Int Value 
if (!isDigit(ch)) {
    throw new IllegalArgumentException("The character " + ch + " is not in the range '0' - '9'");
return ch - 48;
inttoIntValue(char ch, int defaultValue)

Converts the character to the Integer it represents, throwing an exception if the character is not numeric.

This method coverts the char '1' to the int 1 and so on.

 CharUtils.toIntValue('3', -1)  = 3 CharUtils.toIntValue('A', -1)  = -1 
if (isNumeric(ch) == false)
    return defaultValue;
return ch - 48;
inttoIntValue(final char ch)

Converts the character to the Integer it represents, throwing an exception if the character is not numeric.

This method converts the char '1' to the int 1 and so on.

 CharUtils.toIntValue('3')  = 3 CharUtils.toIntValue('A')  throws IllegalArgumentException 
if (!isAsciiNumeric(ch)) {
    throw new IllegalArgumentException("The character " + ch + " is not in the range '0' - '9'");
return ch - 48;
inttoIntValue(final Object o)
to Int Value 
if (o instanceof Integer)
    return ((Integer) o).intValue();
return 0;
inttoIntValue(Object number)
Returns the number object as an int 
if (number == null) {
    return 0;
if (number instanceof Integer) {
    return ((Integer) number).intValue();
if (number instanceof String) {
    String n = (String) number;
...
StringtoIntValueString(byte[] ip)
to Int Value String 
int v1 = ip[3] & 0xFF;
int v2 = (ip[2] << 8) & 0xFF00;
int v3 = (ip[1] << 16) & 0xFF0000;
int v4 = (ip[0] << 24);
long ipValue = ((long) (v4 | v3 | v2 | v1)) & 0x00000000FFFFFFFFl;
return String.valueOf(ipValue);
inttoIntWithoutOverflow(float value)
Like Math#toIntExact(long) but for int range. 
if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
    throw new ArithmeticException("int overflow");
return (int) value;
inttoIntWithPrefix(byte prefix, byte[] bytes)
to Int With Prefix 
assert (bytes[0] == prefix);
assert (bytes.length >= 5);
return (int) ((0xff & bytes[1]) << 24 | (0xff & bytes[2]) << 16 | (0xff & bytes[3]) << 8
        | (0xff & bytes[4]) << 0);