Login | Register   
LinkedIn
Google+
Twitter
RSS Feed
Download our iPhone app
TODAY'S HEADLINES  |   ARTICLE ARCHIVE  |   FORUMS  |   TIP BANK
Browse DevX
Sign up for e-mail newsletters from DevX


Tip of the Day
Language: Java Language
Expertise: Beginner
Jan 30, 1998

String to int

Question:
I'm a new Java developer and was wondering if there is an easy way to grab information from a String object and place it into an "int". For example:
String sTemp = new String("10");
int    iTemp;
How do I get "sTemp" into "iTemp"? There is no "atoi" function in Java.

Answer:
The Java core API does posses a method equivalent to the C atoi() function in Java. It just isn't located where you might think to find it. The java.lang.Integer class contains a method called parseInt() which will convert a String into an int. The Float, Double, and Long classes also contain analogous methods to convert strings into numbers. They also contain toString() methods to perform the conversion of numbers into strings. The following program will take two arguments, add them, and print the result:

public final class ParseIntExample {

  public static final void main(String[] args) {
    int num1, num2, sum;

    if(args.length != 2) {
      System.err.println("Usage: ParseIntExample  ");
      return;
    }

    try {
      num1 = Integer.parseInt(args[0]);
      num2 = Integer.parseInt(args[1]);
    } catch(NumberFormatException e) {
      System.err.println("You must provide two integer arguments.");
      return;
    }

    sum = num1 + num2;

    System.out.println(num1 + " + " + num2 + " = " + sum);

  }

}
DevX Pro
 
Comment and Contribute

 

 

 

 

 


(Maximum characters: 1200). You have 1200 characters left.

 

 

Sitemap
Thanks for your registration, follow us on our social networks to keep up-to-date