Java lang Integer.toHexString() Method with Examples (original) (raw)

Last Updated : 05 Dec, 2018

The Java.lang.Integer.toHexString() is a built-in function in Java which returns a string representation of the integer argument as an unsigned integer in base 16. The function accepts a single parameter as an argument in Integer data-type.Syntax :

public static String toHexString(int num)

Parameter : The function accepts a single mandatory parameter num - This parameter specifies the number which is to be converted to a Hexadecimal string. The data-type is int.

Return Value : The function returns a string representation of the int argument as an unsigned integer in base 16. Examples:

Input : 11 Output : b

Input : 12 Output : c

Program 1: The program below demonstrates the working of function.

Java `

// Java program to demonstrate working // of java.lang.Integer.toHexString() method import java.lang.Math;

class Gfg1 {

// driver code
public static void main(String args[])
{

    int l = 234;

    // returns the string representation of the unsigned int value
    // represented by the argument in binary (base 2)
    System.out.println("Hex string is " + Integer.toHexString(l));

    l = 11;
    System.out.println("Hex string is " + Integer.toHexString(l));
}

}

`

Output:

Hex string is ea Hex string is b

Program 2: The program below demonstrates the working function when a negative number is passed.

Java `

// Java program to demonstrate // of java.lang.Integer.toHexString() method // negative number

import java.lang.Math;

class Gfg1 {

// driver code
public static void main(String args[])
{
    // when negative number is passed
    System.out.println("Hex is " + Integer.toHexString(-10));
}

}

`

Output:

Hex is fffffff6

Errors and Exception: Whenever a decimal number or a string is passed as an argument, it returns an error message which says "incompatible types". Program 3: The program below demonstrates the working function when a string number is passed.

Java `

// Java program to demonstrate // of java.lang.Integer.toHexString() method // string number

import java.lang.Math;

class Gfg1 {

// driver code
public static void main(String args[])
{
    // when negative number is passed
    System.out.println("Hex is " + Integer.toHexString("12"));
}

}

`

Output:

prog.java:13: error: incompatible types: String cannot be converted to int System.out.println("Hex is " + Integer.toHexString("12"));

Program 4: The program below demonstrates the working function when a decimal is passed.

Java `

// Java program to demonstrate // of java.lang.Integer.toHexString() method // decimal

import java.lang.Math;

class Gfg1 {

// driver code
public static void main(String args[])
{
    // when decimal number is passed
    System.out.println("Hex is " + Integer.toHexString(12.34));
}

}

`

Output:

prog.java:13: error: incompatible types: possible lossy conversion from double to int System.out.println("Hex is " + Integer.toHexString(12.34));