Array traversal in Java - Mini Project: Build & Apply

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Array traversal

📖 Scenario: You are working on a simple program to process a list of daily temperatures recorded in a week. You want to look at each temperature one by one to understand the weather pattern.

🎯 Goal: Build a Java program that stores temperatures in an array and then uses a loop to visit each temperature and print it out.

📋 What You'll Learn

Create an array of integers with exactly these values: 23, 25, 22, 20, 24, 26, 21

Create a variable to hold the length of the array

Use a for loop with an index variable i to traverse the array

Print each temperature value inside the loop

💡 Why This Matters

🌍 Real World

Traversing arrays is a basic skill used in many programs that handle lists of data, like weather apps, shopping lists, or scores.

💼 Career

Understanding how to loop through arrays is essential for any programming job, as it helps process collections of information efficiently.

1

Create the temperature array

Create an integer array called temperatures with these exact values: 23, 25, 22, 20, 24, 26, 21.

Java

// Your code here

💡 Need a hint?

Use curly braces {} to list the values inside the array.

2

Create a variable for array length

Create an integer variable called length and set it to the length of the temperatures array using temperatures.length.

Java

int[] temperatures = {23, 25, 22, 20, 24, 26, 21};
// Your code here

💡 Need a hint?

The length property gives the number of elements in the array.

3

Traverse the array with a for loop

Use a for loop with an integer index variable i starting at 0 and running while i < length. Inside the loop, access the current temperature with temperatures[i].

Java

int[] temperatures = {23, 25, 22, 20, 24, 26, 21};
int length = temperatures.length;
// Your code here

💡 Need a hint?

Use for (int i = 0; i < length; i++) to loop through the array indexes.

4

Print each temperature

Inside the for loop, use System.out.println(temperatures[i]) to print each temperature value.

Java

int[] temperatures = {23, 25, 22, 20, 24, 26, 21};
int length = temperatures.length;
for (int i = 0; i < length; i++) {
    // Your code here
}

💡 Need a hint?

Use System.out.println(temperatures[i]) to print each value on its own line.