Java Integer toHexString() Method

The toHexString() method of Java Integer class returns a string representation of the integer argument as an unsigned integer in hexadecimal base 16.

The following characters are used as hexadecimal digits:

0 1 2 3 4 5 6 7 8 9 a b c d e f
a -> 10
b -> 11
c -> 12
d -> 13
e -> 14
f -> 15

Note: If the argument is negative, the unsigned integer value is the argument plus 2³² otherwise, it is equal to the argument. This value is converted to a string of ASCII digits in hexadecimal (base 16) with no extra leading 0s. If the unsigned magnitude is zero, it is represented by a single zero character '0' otherwise, the first character representation of the unsigned magnitude will not be the zero character.

Explanation:

Decimal Number	Operation (%)	Quotient	Remainder	HexaDecimal Result
975	16	60	15	F
60	16	3	12	CF
3	16	0	3	3CF

Hence:

Decimal Number = 975
HexaDecimal Number = 3CF
Varification = 3*162 + 12*161 + 15*160
                = 3*256 + 12*16 + 15*1
	        = 768 + 192 + 15
	        = 975

Syntax:

Following is the declaration of toHexString () method:

Parameter:

DataType	Parameter	Description	Required/Optional
int	i	It specifies the integer number to be converted in hexadecimal format	Required

Returns:

The toHexString() method returns the string representation of the unsigned integer value represented by the argument in hexadecimal (base 16).

Exceptions:

Compatibility Version:

Java 1.0.2 and above

Example 1

public class IntegerToHexStringExample1 {
	public static void main(String[] args) {		
	    int i = 975;
	    System.out.println("Number = " + i);
	    //returns the string representation of the integer value in HexaDecimal  format
	    System.out.println("HexaDecimal representation is = "+ Integer.toHexString(i).toUpperCase());
    }
}

Number = 975
HexaDecimal representation is = 3CF

Example 2

import java.util.Scanner;
public class IntegerToHexStringExample2 {
	public static void main(String[] args) {
		System.out.print("Enter the Number = ");
		Scanner readInput = new Scanner(System.in);
		int i = readInput.nextInt();
		readInput.close();
	    System.out.println("Number = " + i);
	    //returns the string representation of the integer value in Hexadecimal format
	    System.out.println("HexaDecimal representation is = " + Integer.toHexString(i));
    }
	}

Output:

Enter the Number = 735
Number = 735
HexaDecimal representation is = 2df

Example 3

public class IntegerToHexStringExample3 {
	public static void main(String[] args) {
	    System.out.println(Integer.toHexString(250));
	    System.out.println(Integer.toHexString(-250));	    
	    System.out.println(Integer.toHexString(1050));
	    System.out.println(Integer.toHexString(-1050));
    }
}

Output: