Java 中的蝴蝶图案

17 Mar 2025 | 阅读 2 分钟

在本节中，我们将了解如何创建 Java 程序来打印蝴蝶图案。面试官经常会问这个问题来考察候选人的逻辑思维能力。

为了实现蝴蝶图案的逻辑，我们从用户那里获取输入 N，然后我们将其打印 N 行。

让我们来实现用 Java 打印蝴蝶图案的代码。

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);
    	}
}

输出

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();
 		}
	}
}

输出

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