Java Program to Display Triangle Binary Pattern

Learn how to create a Java program to display triangle binary pattern using nested loops. In this example, the program prints alternating 1s and 0s in a triangular format. The user enters the number of rows using the Scanner class, and the pattern is generated using conditional statements.

Code Explanation (Step-by-Step)

  • Create a Scanner class object to accept user input.
  • Read the number of rows using the sc.nextInt() method.
  • Use nested for loops to generate the triangle pattern.
  • The outer loop controls the number of rows.
  • The inner loop prints the pattern for each row.
  • If j % 2 == 0, print 0; otherwise, print 1.
  • Print a new line after completing each row.
				
					import java.util.Scanner;

public class BinaryPattern {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("Enter the number of rows: ");
        int row = sc.nextInt();

        for (int i = 1; i <= row; i++) {
            for (int j = 1; j <= i; j++) {

                if (j % 2 == 0) {
                    System.out.print("0");
                } else {
                    System.out.print("1");
                }
            }
            System.out.println();
        }

        sc.close();
    }
}

Output :-
enter the number of rows: 7
1
10
101
1010
10101
101010
1010101

Java 8 Program to Display a Triangle Binary Pattern

				
					import java.util.Scanner;
import java.util.stream.IntStream;

public class BinaryPattern {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.print("Enter the number of rows: ");
        int row = sc.nextInt();

        IntStream.rangeClosed(1, row).forEach(i -> {

            IntStream.rangeClosed(1, i)
                     .forEach(j -> System.out.print(j % 2 == 0 ? "0" : "1"));

            System.out.println();
        });

        sc.close();
    }
}

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