Nested for loop in Java - Mini Project: Build & Apply

Nested for loop

📖 Scenario: You are organizing a small event where you want to print a seating chart. The chart shows rows and seats in each row.

🎯 Goal: Build a Java program that uses nested for loops to print seat labels for 3 rows and 4 seats per row.

📋 What You'll Learn

Create a variable for the number of rows

Create a variable for the number of seats per row

Use nested for loops to generate seat labels

Print each seat label in the format 'Row X Seat Y'

💡 Why This Matters

🌍 Real World

Nested loops are useful when you need to work with grids, tables, or any situation with rows and columns, like seating charts or calendars.

💼 Career

Understanding nested loops is important for programming tasks that involve multi-dimensional data, such as game development, data analysis, and user interface design.

1

Create variables for rows and seats

Create an int variable called rows and set it to 3. Create another int variable called seatsPerRow and set it to 4.

Java

int rows = 0;
int seatsPerRow = 0;
// Your code here

Need a hint?

Think of rows as how many rows of seats you have, and seatsPerRow as how many seats are in each row.

2

Start the outer for loop for rows

Write a for loop with variable row that starts at 1 and runs while row <= rows, increasing row by 1 each time.

Java

int rows = 3;
int seatsPerRow = 4;
for (int row = 1; row <= rows; row++) {
    // Your code here
}

Need a hint?

The outer loop controls the rows. Start counting rows from 1 up to the number of rows.

3

Add the inner for loop for seats

Inside the for loop for row, write another for loop with variable seat that starts at 1 and runs while seat <= seatsPerRow, increasing seat by 1 each time.

Java

int rows = 3;
int seatsPerRow = 4;
for (int row = 1; row <= rows; row++) {
    for (int seat = 1; seat <= seatsPerRow; seat++) {
        // Your code here
    }
}

Need a hint?

The inner loop counts seats in each row from 1 up to seatsPerRow.

4

Print seat labels inside inner loop

Inside the inner for loop, write a System.out.println statement that prints the seat label in the format: "Row " + row + " Seat " + seat.

Java

int rows = 3;
int seatsPerRow = 4;
for (int row = 1; row <= rows; row++) {
    for (int seat = 1; seat <= seatsPerRow; seat++) {
        // Your code here
    }
}

Need a hint?

Use System.out.println to print each seat label with the row and seat numbers.