Why arrays are needed in Java - See It in Action

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Why arrays are needed

📖 Scenario: Imagine you run a small store and want to keep track of the prices of 5 different fruits you sell. You want to store these prices so you can easily find and update them later.

🎯 Goal: You will create a simple Java program that uses an array to store the prices of 5 fruits. Then, you will calculate the total price of all fruits combined.

📋 What You'll Learn

Create an array to hold 5 fruit prices

Create a variable to hold the total price

Use a for loop to add all prices in the array

Print the total price

💡 Why This Matters

🌍 Real World

Stores often need to keep track of many items like prices, quantities, or names. Arrays help organize this data neatly.

💼 Career

Understanding arrays is essential for programming jobs because they are used everywhere to handle lists of data efficiently.

1

Create an array of fruit prices

Create an array called fruitPrices of type double with these exact values: 1.5, 2.0, 0.75, 3.0, 2.5.

Java

// Your code here

💡 Need a hint?

Use double[] fruitPrices = { ... }; to create the array with the given values.

2

Create a variable to hold the total price

Add a variable called totalPrice of type double and set it to 0.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = {1.5, 2.0, 0.75, 3.0, 2.5};
        // Your code here
    }
}

💡 Need a hint?

Use double totalPrice = 0; to create the variable.

3

Add all fruit prices using a for loop

Use a for loop with variable i from 0 to fruitPrices.length - 1 to add each price in fruitPrices[i] to totalPrice.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = {1.5, 2.0, 0.75, 3.0, 2.5};
        double totalPrice = 0;
        // Your code here
    }
}

💡 Need a hint?

Use a for loop to go through each index and add the value to totalPrice.

4

Print the total price

Write System.out.println(totalPrice); to display the total price of all fruits.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = {1.5, 2.0, 0.75, 3.0, 2.5};
        double totalPrice = 0;
        for (int i = 0; i < fruitPrices.length; i++) {
            totalPrice += fruitPrices[i];
        }
        // Your code here
    }
}

💡 Need a hint?

Use System.out.println(totalPrice); to print the result.