Programs for printing pyramid patterns in Java

import java.util.Scanner;


public class First2 {


public void p1() {
Scanner sc = new Scanner(System.in);
int row = sc.nextInt();
for (int i = 1; i <= row; i++) {
for (int j = i; j < row; j++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}

}

public void p2() {
Scanner sc = new Scanner(System.in);
int rows1 = sc.nextInt();
for (int i = 1; i <= rows1; i++) {
for (int j = i; j < rows1; j++) {
System.out.print(" ");
}
for (int j = 1; j <= (2 * i - 1); j++) {
System.out.print("*");
}

System.out.println();

}
for (int i = rows1; i >= 1; i--) {
for (int j = i; j < rows1; j++) {
System.out.print(" ");
}
for (int j = 1; j <= (2 * i - 1); j++) {
System.out.print("*");
}

System.out.println();

}

}

public void p3() {
Scanner sc = new Scanner(System.in);
int row = sc.nextInt();
for (int i = 1; i <= row; i++) {
for (int j = i; j < row; j++) {
System.out.print(" ");
}
for (int k = 1; k <= 2 * i - 1; k++) {
System.out.print("*");
}

System.out.println();
}
}

public static void main(String[] args) {
First2 f = new First2();
f.p1();
f.p2();
f.p3();
// f.ArithError();

}
}

output

-----------

3

  *

 ***

*****

4

   *

  ***

 *****

*******

*******

 *****

  ***

   *

5

    *

   ***

  *****

 *******

*********