Butterfly Pattern in Java

by Online Tutorials Library July 22, 2022

Butterfly Pattern in Java

In this section, we will understand how to create a Java program to pint the Butterfly Pattern. It is frequently asked by the interviewers to check the logical thinking of the of the candidate.

In order to implement the logic for Butterfly Pattern, we take input N from the user and then we print it over N rows.

Let’s implement the code for printing the Butterfly Pattern in Java.

ButterFlyPatternExample.java

  // import required classes  import java.util.Scanner;  // create class ButterFlyPatternExample to design butterfly pattern  public class ButterFlyPatternExample {  // create drawButterflyPattern() method that will print Butterfly over n rows  public static void drawButterflyPattern(int N) {  // declare and initialize variables that helps to print Butterfly pattern  int space = 2*N-1;  int star = 0;  // use for loop           for(int j = 1; j <= 2*N-1; j++){              if(j <= N){                  space = space – 2;                  star++;              }              else {                  space = space + 2;                  star–;              }  // use for loop to print star              for(int m = 1; m <= star; m++){                  System.out.print(“*”);              }  // use for loop to print space              for(int n = 1; n <= space; n++){                  System.out.print(” “);              }  // use for loop to print star for special case              for(int p = 1; p <= star; p++){                  if(p != N){  System.out.print(“*”);  }              }              System.out.println();          }  }  // main() method start      public static void main(String[] args) {  int N;  // create Scanner class object to take input from user          Scanner sc = new Scanner(System.in);          System.out.println(“Enter value of N”);  N = sc.nextInt();  // close scanner class object  sc.close();  // call drawButterflyPattern() method   drawButterflyPattern(N);      }  }  

Output:

Butterfly Pattern in Java

ButterflyPatternExampleNew.java

  //import required classes  import java.util.Scanner;   //create class ButterflyPatternExampleNew to design butterfly pattern  public class ButterflyPatternExampleNew {  // main() method start   public static void main(String[] args) {  int N;  // create Scanner class object to take input from user      Scanner scan = new Scanner(System.in);       System.out.println(“Enter value of N”);  N = scan.nextInt();    // call drawButterflyPattern() method of class ButterflyPattern  ButterflyPattern obj = new ButterflyPattern();  obj.drawButterflyPattern(N);    // close scanner class object  scan.close();     }  }  // create a separate class ButterflyPattern  class ButterflyPattern{    // create user-defined method that will draw butterfly pattern  public void drawButterflyPattern(int N) {    // declare and initialize variables that helps to print Butterfly pattern  int space = 2*N-1;  int star = 0;    // use for loop    for(int j = 1; j <= 2*N-1; j++){       if(j <= N){           space = space – 2;           star++;       }       else {           space = space + 2;           star–;       }  // use for loop to print star       for(int m = 1; m <= star; m++){           System.out.print(“*”);       }  // use for loop to print space       for(int n = 1; n <= space; n++){           System.out.print(” “);       }  // use for loop to print star for special case       for(int p = 1; p <= star; p++){           if(p != N){  System.out.print(“*”);  }       }       System.out.println();   }  }  }  

Output:

Butterfly Pattern in Java

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