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Convert a String into an Integer Data
Posted on: June 15, 2007 at 12:00 AM

In this section, you will learn to convert a string type data into an integer type.

Convert a String into an Integer Data

In this section, you will learn to convert a string type data into an integer type. The java.lang package provides the functionality to convert the string type data into an integer type data.

Code Description:

This program takes a string type data on the console and converts it into an integer. Data at the console is as a string type so, it must be converted into an integer type using the parseInt() method. This method converts the string type number into an integer format. Whenever you give the string type data as 's' then the exception must be thrown.

parseInt():
The parseInt() method parses the string parameter as a signed decimal integer. This method is used to convert an integer type data into a string type data.

Here is the code of this code:


import java.io.*;

import java.lang.*;



public class  StringToInt{

  public static void main(String[] args)throws IOException {

  BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));

  System.out.println("Enter an integer number: ");

  String str = bf.readLine();

  int i = Integer.parseInt(str);

  System.out.println("String: " + str);

  System.out.println("Integer: " + i);

  }

}

Download this program:

Output this program.

C:\vinod\convert>javac StringToInt.java

C:\vinod\convert>java StringToInt
Enter an integer number:
10
String: 10
Integer: 10

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