Java program to display star Pyramid pattern

In this tutorial, we will discuss about Java program to display star Pyramid pattern.

Here, we can see four type of pyramid pattern displays using nested for loop in Java using stars

Code to star Pyramid pattern 1

Program

import java.util.Scanner; 
public class Pyramid_pattern1{
public static void main(String args[]){
Scanner sc=new Scanner(System.in); //Scanner class in java
System.out.print("Enter the rows you want");
int rows=sc.nextInt();
System.out.println("");

for (int i=1; i<=rows; i++){//outer forloop
  for (int j=1; j<=(rows-i)*2; j++){
  System.out.print(" ");//create space for pyramid shape
  }
for (int k=i; k>=1; k--){//inner for loops
  System.out.print(" "+"*");//create left half            
}										
for (int l=2; l<=i; l++){
  System.out.print(" "+"*");    //create right half
}//end outer for loop                            
System.out.println();
}
                                                   
}

When the above code is executed, it produces the following results:

Enter the rows you want
                                               *
                                           *  *  *
                                       *  *  *  *  *
                                   *  *  *  * *  *  *
                               *  *  *  *  *  *  *  *  *
                            *  *  *  *  * *  *  *  *  *  *
                        *  *  *  *  *  *  *  *  *  *  *  *  *
                    *  *  *  *  *  *  *  *  *  *  *  *  *  *  *
                *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *  *

Code to star Pyramid pattern 1

Program

import java.util.Scanner;
class invertedPyramid1{
public static void main(String args[]){
Scanner sc=new Scanner(System.in); //Scanner class in java
System.out.print("Enter the rows you want");
int rows=sc.nextInt();
System.out.println(" ");
int i,j;
for(i=rows; i>=1; i--){//outer for loop(parent)
    for(j=i; j<=rows; j++){ //inner for loop 1(child)
       System.out.print(" ");	//print initial space for piramid
            }
    for(j=1; j<=(2*i-1); j++){ //inner for loop 2(child)
       System.out.print("*");	
            }
            System.out.println(" ");//print next line

        }
    }
}

When the above code is executed, it produces the following results:

*****************
  ***************
    *************
      ***********
        *********
          *******
            *****
              ***
                *

Code to star Pyramid pattern 3

Program 3

import java.util.*;
class PyramidTriangle3{
public static void main(String args[]){
int i,j,row;
Scanner s=new Scanner(System.in);
System.out.println("Enter value for row: ");
row=s.nextInt();
for(i=1; i<=row; i++){
   for(j=1; j<=i; j++){
System.out.print("*");
}
System.out.println(" ");
}
for(i=row; i>=1; i--){
   for(j=1; j<i; j++){
System.out.print("*");
}
System.out.println(" ");
}
}
}

When the above code is executed, it produces the following results:

Enter value for row:
8
*
**
***
****
*****
******
*******
********
*******
******
*****
****
***
**
*

Code to star Pyramid pattern 4

import java.util.*;
class PyramidTriangle4{
public static void main(String args[]){
int i,j,row;
Scanner s=new Scanner(System.in);
System.out.println("Enter value for row: ");
row=s.nextInt();
 for(i=1; i<=row; i++){
   for(j=i; j<row; j++){
       System.out.print(" ");
   }
   for(j=1; j<=i; j++){
   System.out.print("*");
     }
System.out.println("");
}

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

When the above code is executed, it produces the following results:

              *
            **
          ***
        ****
      *****
    ******
  *******
********
  *******
    ******
      *****
        ****
          ***
            **
              *

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