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Tip of the Day
Language: Java
Expertise: Beginner
Sep 12, 1998



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Converting a String into an int

The Java core API possesses a method equivalent to the C atoi() function in Java. 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  ");

    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); } }
Daniel Savarese
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