Java Integer decode() method

The decode() method is a static method of Integer class under java.lang package. The main function of this method is to decode a string which is written in the form of (" ") into an integer value.

The decode() method also accepts decimal, hexadecimal, and octal numbers. It is given by the following grammar:

DecodableString:

Signopt DecimalNumeral
Signopt 0x HexDigits
Signopt 0X HexDigits
Signopt # HexDigits
Signopt 0 OctalDigits

Sign:

This type of String will throw a NumberFormatException or represent a positive value. The result is negated if sign of the first character of the decodable String is minus. There are no whitespace characters are permitted in the String.

Syntax

Following is the declaration of decode() method:

Parameter:

Returns:

The decode() method returns an Integer object which hold the int value represented by String nm.

Exceptions:

NumberFormatException - This method throws an exception if the String does not contain an integer which can be parsed.

Compatibility Version:

Java 1.2 and above

Example 1

Output:

81
276
-260

Example 2

Output:

Integer Number is = 555

Example 3

This is an example in which we pass the String value and it shows NumberFormatException.

Output:

Exception in thread "main"java.lang.NumberFormatException: For input string: "JavaTpoint"
	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
	at java.lang.Integer.parseInt(Integer.java:580)
	at java.lang.Integer.valueOf(Integer.java:740)
	at java.lang.Integer.decode(Integer.java:1197)
	at myPackage.DecodeMethodExample.main(DecodeMethodExample.java:8)

Example 4

Output:

Enter a value to decode: 656
Result:656