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Copy pathHollowButterfly.java
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59 lines (52 loc) · 1.59 KB
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package algorithms.patterns;
import java.util.Scanner;
public class HollowButterfly {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter number of rows:");
int n = sc.nextInt();
// upper half
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
if (j == 1 || j == i) {
System.out.print("* ");
} else {
System.out.print(" ");
}
}
for (int j = 1; j <= 2 * (n - i); j++) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
if (j == 1 || j == i) {
System.out.print("* ");
} else {
System.out.print(" ");
}
}
System.out.println();
}
// lower half
for (int i = n; i >= 1; i--) {
for (int j = 1; j <= i; j++) {
if (j == 1 || j == i) {
System.out.print("* ");
} else {
System.out.print(" ");
}
}
for (int j = 1; j <= 2 * (n - i); j++) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
if (j == 1 || j == i) {
System.out.print("* ");
} else {
System.out.print(" ");
}
}
System.out.println();
}
sc.close();
}
}