Java Integer toString() Method

The Integer.toString() method in Java is used to convert an int value to a String. This method has several overloaded versions, each providing different functionalities for converting integers to strings.

Table of Contents

1. Introduction
2. toString() Method Syntax
3. Overloaded Versions
   • toString(int i)
   • toString(int i, int radix)
   • toString()
4. Examples
   • Converting an Integer to a String
   • Converting an Integer to a String with Different Radix
   • Using the toString() Method of an Integer Object
5. Real-World Use Case
6. Conclusion

Introduction

The Integer.toString() method is part of the Integer class in Java and is used to convert integers to their string representations. This method is useful for displaying numbers as strings, performing string operations on numbers, and converting numbers to different numeral systems.

toString()() Method Syntax

There are three primary overloaded versions of the toString() method in the Integer class:

1. public static String toString(int i)
2. public static String toString(int i, int radix)
3. public String toString()

Overloaded Versions

1. toString(int i)

This method converts the integer i to a string in base 10.

public static String toString(int i)

• i: The integer to be converted to a string.

The method returns:

• A string representing the specified integer in base 10.

2. toString(int i, int radix)

This method converts the integer i to a string in the specified radix (base).

public static String toString(int i, int radix)

• i: The integer to be converted to a string.
• radix: The base to use for the conversion (e.g., 2 for binary, 8 for octal, 16 for hexadecimal).

The method returns:

• A string representing the specified integer in the specified radix.

3. toString()

This method converts the Integer object to a string in base 10.

public String toString()

The method returns:

• A string representing the value of the Integer object in base 10.

Examples

Converting an Integer to a String

The toString(int i) method converts an integer to its string representation in base 10.

Example

public class ToStringExample {
    public static void main(String[] args) {
        int number = 123;
        String result = Integer.toString(number);

        System.out.println("String representation of " + number + ": " + result);
    }
}

Output:

String representation of 123: 123

In this example, the integer 123 is converted to the string "123".

Converting an Integer to a String with Different Radix

The toString(int i, int radix) method converts an integer to its string representation in the specified radix.

Example

public class ToStringWithRadixExample {
    public static void main(String[] args) {
        int number = 255;

        String binaryString = Integer.toString(number, 2);
        String octalString = Integer.toString(number, 8);
        String hexString = Integer.toString(number, 16);

        System.out.println("Binary representation of " + number + ": " + binaryString);
        System.out.println("Octal representation of " + number + ": " + octalString);
        System.out.println("Hexadecimal representation of " + number + ": " + hexString);
    }
}

Output:

Binary representation of 255: 11111111
Octal representation of 255: 377
Hexadecimal representation of 255: ff

In this example, the integer 255 is converted to its binary, octal, and hexadecimal string representations.

Using the toString() Method of an Integer Object

The toString() method of an Integer object converts the object's value to its string representation in base 10.

Example

public class IntegerObjectToStringExample {
    public static void main(String[] args) {
        Integer integerObject = 456;
        String result = integerObject.toString();

        System.out.println("String representation of " + integerObject + ": " + result);
    }
}

Output:

String representation of 456: 456

In this example, the Integer object with the value 456 is converted to the string "456".

Real-World Use Case

Logging and Debugging

In a real-world application, you might use the Integer.toString() method to convert integers to strings for logging and debugging purposes.

Example

import java.util.logging.Logger;

public class LoggingExample {
    private static final Logger logger = Logger.getLogger(LoggingExample.class.getName());

    public static void main(String[] args) {
        int userId = 1024;
        int orderId = 2048;

        logger.info("User ID: " + Integer.toString(userId));
        logger.info("Order ID: " + Integer.toString(orderId, 16)); // Logging in hexadecimal format
    }
}

Output:

INFO: User ID: 1024
INFO: Order ID: 800

In this example, the Integer.toString() method is used to convert integers to strings for logging purposes, including logging in different numeral systems.

Conclusion

The Integer.toString() method in Java is a versatile tool for converting integers to their string representations. By understanding how to use the different overloaded versions of this method, you can efficiently handle tasks that involve displaying and manipulating string representations of integers in your Java applications. Whether you are dealing with base 10, different numeral systems, or Integer objects, the toString() method provides a reliable solution for these tasks.