How to Convert int to string in Java

Last Updated on July 26, 2023 by Mayank Dham

Converting data types is a common task in programming, and in Java, converting an int to a String is a frequent requirement. Whether it’s for displaying an integer value as text, performing string manipulations, or storing the numeric value as a string, having the ability to convert an int to a String is essential. Java provides multiple approaches to accomplish this conversion, each with its own benefits and use cases. In this article, we will explore various techniques to convert an int to a String in Java, empowering you with the knowledge to choose the most suitable approach for your programming needs. Let’s dive into the world of converting int to String in Java.

Different ways to convert int to string Java

Here are some of the most common ways to convert int to string java. So let us discuss each of the approaches in detail

1. Using String.valueOf() method:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           String strNumber = String.valueOf(number);
           System.out.println(strNumber);
       }
   }

   Output

   123

2. By concatenating the int with an empty string:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           String strNumber = "" + number;
           System.out.println(strNumber);
       }
   }

   Output

   123

3. Using the Integer.toString() method:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           String strNumber = Integer.toString(number);
           System.out.println(strNumber);
       }
   }

   Output

   123

4. Using String.format() method:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           String strNumber = String.format("%d", number);
           System.out.println(strNumber);
       }
   }

   Output

   123

5. Using StringBuilder or StringBuffer:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           StringBuilder stringBuilder = new StringBuilder();
           stringBuilder.append(number);
           String strNumber = stringBuilder.toString();
           System.out.println(strNumber);
       }
   }

   Output

   123

6. Using the String constructor:

   public class IntToStringExample {
       public static void main(String[] args) {
           int number = 123;
           String strNumber = new String(String.valueOf(number));
           System.out.println(strNumber);
       }
   }

   Output
   123

Conclusion
Converting a ‘int’ to a ‘String’ in Java is a fundamental operation that you will encounter frequently throughout your programming career. To accomplish this conversion, we tried several methods, including using the ‘Integer.toString()’ method and concatenating with an empty string. Both methods are simple and efficient, allowing you to convert a ‘int’ value to its string representation. The approach you use is determined by your coding style, preferences, and the specific requirements of your application. If you prefer a more explicit and method-based approach, ‘Integer.toString()’ offers a clean and simple solution. Concatenating a ‘int’ with an empty string, on the other hand, provides a concise and convenient way to convert a ‘int’ to a ‘String’.

You can effectively manipulate and process numeric values as strings by mastering the art of converting ‘int’ to ‘String’ in Java, opening up possibilities for string operations, string concatenation, and numeric data storage as text. It is a critical skill that will improve your ability to work with various data types and allow for seamless integration with other Java program components.

Frequently Asked Questions (FAQs)

Here are some of the most common FAQs on how to convert integer to string in Java

Q1. How to convert int to string in Java ASCII?
To convert an int to a String in Java ASCII, you can use the Character.toString() method. Here’s an example:

int number = 65; // ASCII value for 'A'
String asciiString = Character.toString((char) number);

In this example, the int value 65 is cast to a char and then converted to a String using Character.toString(). The resulting asciiString will be the string "A", representing the ASCII character corresponding to the given int value.

Q2. How to convert char to string in Java?
Converting a char to a String in Java is straightforward. You can use the Character.toString() method or concatenate the char with an empty string. Here are the examples:

char character = 'A';
String charString1 = Character.toString(character);
String charString2 = "" + character;

Both approaches will convert the char value 'A' to a String, resulting in charString1 and charString2 containing the string "A".

Q3. How to convert input int to string?
To convert an input int to a String in Java, you can make use of the Integer.toString() method. Here’s an example that takes input from the user and converts it to a String:

import java.util.Scanner;

public class IntToStringConversionExample {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter an integer: ");
        int number = scanner.nextInt();

        String strNumber = Integer.toString(number);
        System.out.println("Converted string: " + strNumber);
    }
}

In this example, the program prompts the user to enter an integer, reads the input using the Scanner class, and converts the input int to a String using Integer.toString(). The resulting strNumber is then printed.

Q4. What is toString() in Java?
In Java, toString() is a method defined in the Object class, which is the root class for all other classes in Java. It is used to obtain a string representation of an object. The toString() method is overridden in many Java classes to provide meaningful information about the object’s state or contents.

By default, when you call toString() on an object, it returns a string representation in the format: ClassName@HashCode. However, it is common to override this method in your own classes to provide more useful information. By overriding toString(), you can specify the string representation of your objects based on your requirements.

Q5. How to get ASCII of a string in Java?
To get the ASCII values of characters in a string in Java, you can iterate over each character of the string and convert it to an int. Here’s an example:

String text = "Hello";
for (int i = 0; i < text.length(); i++) {
    char character = text.charAt(i);
    int asciiValue = (int) character;
    System.out.println("ASCII value of " + character + " = " + asciiValue);
}

In this example, the for loop iterates over each character of the text string. The char is cast to an int using (int) character, which gives the ASCII value of the character. The ASCII value is then printed for each character in the string.