Array declaration and initialization in Java - Mini Project: Build & Apply

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Array declaration and initialization

📖 Scenario: You are helping a small store keep track of the prices of some fruits they sell. You will create an array to store these prices.

🎯 Goal: Create an array to hold fruit prices, set a size, fill it with values, and then print the prices.

📋 What You'll Learn

Declare an array of type double called fruitPrices

Initialize the array with a size of 4

Assign the prices 1.99, 2.49, 0.99, and 3.49 to the array elements

Print all the prices in the array

💡 Why This Matters

🌍 Real World

Arrays are used to store lists of data like prices, names, or measurements in many software applications.

💼 Career

Understanding arrays is essential for programming jobs because they help manage collections of data efficiently.

1

Declare and initialize the array

Declare an array of type double called fruitPrices and initialize it with size 4.

Java

// Your code here

💡 Need a hint?

Use double[] fruitPrices = new double[4]; to create the array.

2

Assign prices to the array elements

Assign the prices 1.99, 2.49, 0.99, and 3.49 to the array elements fruitPrices[0], fruitPrices[1], fruitPrices[2], and fruitPrices[3] respectively.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = new double[4];
        // Your code here
    }
}

💡 Need a hint?

Assign each price to the correct index like fruitPrices[0] = 1.99;

3

Use a for loop to print all prices

Use a for loop with variable i from 0 to 3 to print each price in fruitPrices[i] using System.out.println.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = new double[4];
        fruitPrices[0] = 1.99;
        fruitPrices[1] = 2.49;
        fruitPrices[2] = 0.99;
        fruitPrices[3] = 3.49;
        // Your code here
    }
}

💡 Need a hint?

Use a for loop from 0 to 3 and print each element with System.out.println(fruitPrices[i]);

4

Print all fruit prices

Run the program to print all the fruit prices stored in the fruitPrices array.

Java

public class Main {
    public static void main(String[] args) {
        double[] fruitPrices = new double[4];
        fruitPrices[0] = 1.99;
        fruitPrices[1] = 2.49;
        fruitPrices[2] = 0.99;
        fruitPrices[3] = 3.49;
        for (int i = 0; i < 4; i++) {
            System.out.println(fruitPrices[i]);
        }
    }
}
// Your code here

💡 Need a hint?

Run the program and check the output matches the prices.