Break statement in Java - Mini Project: Build & Apply

Using the Break Statement in Java Loops

📖 Scenario: Imagine you are checking a list of daily temperatures to find the first day when the temperature reaches or exceeds a certain limit. Once you find that day, you want to stop checking further days.

🎯 Goal: You will write a Java program that uses a break statement inside a for loop to stop the loop early when a temperature threshold is met.

📋 What You'll Learn

Create an array of temperatures with exact values

Create an integer variable for the temperature threshold

Use a for loop to check each temperature with variables i and temp

Use a break statement to exit the loop when the temperature reaches or exceeds the threshold

Print the index of the first day that meets the threshold

💡 Why This Matters

🌍 Real World

Checking sensor data or daily measurements to find the first occurrence of a condition is common in weather apps, health monitors, and quality control.

💼 Career

Understanding how to use break statements helps developers write efficient loops that stop processing when no longer needed, saving time and resources.

1

Create the temperature array

Create an integer array called temperatures with these exact values: 23, 25, 28, 30, 27, 31, 29.

Java

// Create the temperatures array
// Your code here

Need a hint?

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

2

Set the temperature threshold

Create an integer variable called threshold and set it to 30.

Java

int[] temperatures = {23, 25, 28, 30, 27, 31, 29};
// Create the threshold variable
// Your code here

Need a hint?

Use int threshold = 30; to create the variable.

3

Use a for loop with break

Write a for loop using int i = 0; i < temperatures.length; i++ and inside the loop assign int temp = temperatures[i]. Use an if statement to check if temp >= threshold. If true, use break to exit the loop.

Java

int[] temperatures = {23, 25, 28, 30, 27, 31, 29};
int threshold = 30;
// Write the for loop with break
// Your code here

Need a hint?

Remember to declare int i before the loop so you can use it after the loop ends.

4

Print the first day meeting the threshold

Write a System.out.println statement to print: "First day with temperature >= 30 is: " followed by the value of i.

Java

int[] temperatures = {23, 25, 28, 30, 27, 31, 29};
int threshold = 30;
int i;
for (i = 0; i = threshold) {
        break;
    }
}
// Print the result
// Your code here

Need a hint?

The first temperature >= 30 is at index 3, so the output should show that.