Parsing numeric arguments in Java - Mini Project: Build & Apply

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Parsing numeric arguments

📖 Scenario: You are creating a simple Java program that reads two numbers given as text (strings) and converts them into numbers to add them together.

🎯 Goal: Build a Java program that parses two string arguments into integers, adds them, and prints the result.

📋 What You'll Learn

Create two string variables with exact values "15" and "27"

Create an integer variable to hold the parsed value of the first string

Create an integer variable to hold the parsed value of the second string

Add the two integers and store the result in a variable

Print the result

💡 Why This Matters

🌍 Real World

Parsing numeric arguments is common when reading user input, command-line arguments, or data from files where numbers are stored as text.

💼 Career

Many programming jobs require converting text input into numbers to perform calculations, validations, or data processing.

1

Create string variables for the numbers

Create two string variables called num1 and num2 with the exact values "15" and "27" respectively.

Java

// Create two string variables num1 and num2 with values "15" and "27"
// Your code here

💡 Need a hint?

Use String type and assign the exact text values.

2

Parse the strings into integers

Add two integer variables called number1 and number2 that parse the strings num1 and num2 using Integer.parseInt().

Java

public class Main {
    public static void main(String[] args) {
        String num1 = "15";
        String num2 = "27";
        // Parse num1 and num2 into integers number1 and number2
        // Your code here
    }
}

💡 Need a hint?

Use Integer.parseInt() to convert strings to integers.

3

Add the two integers

Create an integer variable called sum that adds number1 and number2.

Java

public class Main {
    public static void main(String[] args) {
        String num1 = "15";
        String num2 = "27";
        int number1 = Integer.parseInt(num1);
        int number2 = Integer.parseInt(num2);
        // Add number1 and number2 into sum
        // Your code here
    }
}

💡 Need a hint?

Use the + operator to add two integers.

4

Print the sum

Use System.out.println() to print the value of sum.

Java

public class Main {
    public static void main(String[] args) {
        String num1 = "15";
        String num2 = "27";
        int number1 = Integer.parseInt(num1);
        int number2 = Integer.parseInt(num2);
        int sum = number1 + number2;
        // Print the sum
        // Your code here
    }
}

💡 Need a hint?

Use System.out.println(sum); to display the result.