Java Program to Convert String to int

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In the previous article we have discussed Java Program to Convert Wrapper Objects to Primitive Types.

In this article we will see how to convert string type to integer type.

Program to Convert String to int

Let’s see some examples of both the types.

Example-1: String types

int a = "b";
int b = "BTechGeeks";
Examples-2: int types

int a = 5;
int b = 57;

Let’s see howtodo it.

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Method 1 : Java Program to Convert String to int Using parseInt() method

String type variable can be converted to Integer by using  parseInt(), let’s see how it actually works.

Here this method is a wrapper class in Java. This method of the Integer class converts the string variables into Integer.

Approach :

  1. Take a string value and store it in a string  variable input1.
  2. Then pass that input1 variable as parameter to parseInt() method which will convert the string into Integer value and return it .
  3. Store that Integer value  in a variable output .
  4. Display the result .

Program:

import java.util.Scanner;

public class Main
    {
    public static void main(String[] args)
    {
        // creating scanner object
        Scanner sc = new Scanner(System.in);
        // input a String through scanner class
        System.out.print("Enter a string : ");
        String input1=sc.next();
        // converting to Integer
        int output =Integer.parseInt(input1) ;
        System.out.println("Converted Integer value is : " + output);
    }
}
Output : 

Enter a string : 434
Converted Integer value is : 434

Method 2 : Java Program to Convert String to int Using valueOf() method

String type variable can be converted to Integer by using  valueOf() , let’s see how it actually works.

This method returns an object of the Integer class. However, the object will be  automatically converted into the primitive type.

 Approach :

  1. Take a string value and store it in a string  variable input1
  2. Then pass that input1 variable as parameter to valueOf() method which will convert the string into Integer value and return it .
  3. store that Integer value  in a variable output .
  4. Display the result .

Program:

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        // creating scanner object
        Scanner sc = new Scanner(System.in);
        // input a String through scanner class
        System.out.print("Enter a string : ");
        String input1=sc.next();
        // converting to Integer
        Integer output =Integer.valueOf(input1) ;
        System.out.println("Converted Integer value is : " + output);
    }
}
Output : 

Enter a string : 434
Converted Integer value is : 434

Beginners and experienced programmers can rely on these Best Java Programs Examples and code
various basic and complex logics in the Java programming language with ease.

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