In this Java program, we will learn to convert the integer variables to a string value. Java provides multiple ways to convert an int type variable to a String type.
This program defines an int variable number with the value 25. Then, it demonstrates the use of the Integer.toString() method, the String.valueOf() method, the Integer.toString() method with a radix, the StringBuilder class, and the + operator for converting the int to a String.
Using the Integer.toString() method
int number = 25; String str = Integer.toString(number);
Integer.toString() method takes an int as an argument and returns the equivalent String representation.
Using the String.valueOf() method
int number = 25; String str = String.valueOf(number);
String.valueOf() method also takes an int as an argument and returns the equivalent String representation. It can be also used to convert other primitive types like long, float, double etc.
Using the Integer.toString() method with radix
int number = 25; String str = Integer.toString(number, 16);
Integer.toString() method takes two arguments, the first being the int to convert, and the second being the radix (base) to use for the conversion. In this example, the radix is 16, so the output is the hexadecimal representation of the number.
Using StringBuilder Class
int number = 25; String str = new StringBuilder().append(number).toString();
This approach uses the append() method to append the int to a StringBuilder object, and then calls the toString() method to get the equivalent String representation.
Using + operator
int number = 25; String str = "" + number;
This approach uses the + operator to concatenate an empty string and the int, which results in the int being converted to a String.
Java Program to Convert Integer to String
Here is a full Java program that demonstrates the use of the different methods for converting an int to a String.
public class IntToStringExample {
public static void main(String[] args) {
int number = 25;
// Using Integer.toString() method
String str1 = Integer.toString(number);
System.out.println("Integer.toString(): " + str1);
// Using String.valueOf() method
String str2 = String.valueOf(number);
System.out.println("String.valueOf(): " + str2);
// Using Integer.toString() method with radix
String str3 = Integer.toString(number, 16);
System.out.println("Integer.toString(radix): " + str3);
// Using StringBuilder
String str4 = new StringBuilder().append(number).toString();
System.out.println("StringBuilder: " + str4);
// Using '+' operator
String str5 = "" + number;
System.out.println("+ operator: " + str5);
}
}
Output
Integer.toString(): 25 String.valueOf(): 25 Integer.toString(radix): 25 StringBuilder: 25 + operator: 25
This program defines an int variable number with the value 42. Then, it demonstrates the use of the Integer.toString() method, the String.valueOf() method, the Integer.toString() method with a radix, the StringBuilder class, and the + operator for converting the int to a String.