# JAVA Program for Hollow Pyramid Star Pattern

## Printing Hollow Pyramid Star Pattern

In this JAVA program we’re going to code hollow pyramid star pattern program .

The logic of this program is this take any number input from user and store it in variable n and then run the for loop start from i=1 to i<=n and inside the outer for loop take another for loop for (j = i; j < n; j++) to print spaces .

After this run a while loop (k!=(2*i-1)) and inside while loop take if k==0 or k==2*i-2 then print line changement statement and then print star statement.

## Algorithm:

• Enter the number from the user and store it in any variable.(‘n‘ in this case).
• Run a loop ‘n’ number of times to iterate through each of the rows. From i=0 to i<=n. The loop should be structured as for (i = 1; i <= n; i++)
•  Run a nested loop inside the main loop to print the spaces before the pyramid. From j=i to j<n The loop should be structured as for (j = i; j < n; j++)
• Inside this nested loop print white space System.out.println(” “).
• Run a while loop in condition while (k != (2 * i – 1))
• Inside while loop take if k==0 or k==2*i-2 and print System.out.print(“*”);
• Inside main loop move to the next line by printing a new line . System.out.println();
• Take for (i = 0; i < 2 * n – 1; i++) to print last line System.out.print(“*”);

## Code in Java:

```import java.util.Scanner;
public class Pattern1 {

public static void main(String[] args) {
int i, j, k = 0;
Scanner sc = new Scanner(System.in);
System.out.println("Enter number");
int n=sc.nextInt();
for (i = 1; i <= n; i++)
{

for (j = i; j < n; j++)
System.out.print(" ");
while (k != (2 * i - 1)) {
if (k == 0 || k == 2 * i - 2)
System.out.print("*");
else
System.out.print(" ");
k++;
;
}
k = 0;
System.out.println();
}
// print last row
for (i = 0; i < 2 * n - 1; i++)
System.out.print("*");

}
}
This code is contributed by Shubham Nigam (Prepinsta Placement Cell Student)
```

### 4 comments on “JAVA Program for Hollow Pyramid Star Pattern”

• Sambit

public class pro4 {

public static void main(String[] args) {
int count=0;
for(int i=1;i<=3;i++) {

for(int j=1;j<=4-i;j++) {
System.out.print(" ");
}
for(int j=1;j<=i+count;j++) {
if(j==1||j==i+count) {
System.out.print("*");
}else {
System.out.print(" ");
}
}
count+=1;
System.out.println();
}
for(int j=1;j<=2*4-1;j++) {
System.out.print("*");
}
}

}

• Md

import java.lang.*;
import java.util.*;
import java.io.*;
public class Main
{
public static void main(String[] args) {
int row=4;
int col=7;
for(int i=0;i<row;i++){
if(i==3){
for(int j=0;j<col;j++){
System.out.print("*");
}
}
else{
for(int j=i;j<row-1;j++){
System.out.print(" ");
}
for(int j=0;j<5;j++){
if(j==0 && i==0){
System.out.print("*");
break;
}
else if((j==0 || j==2 ) && ( i==1)){
System.out.print("*");
}
else if(i==2){
if(j==0 || j==4){
System.out.print("*");}
else{
System.out.print(" ");
}
}
else{
System.out.print(" ");
}
}
System.out.println();
}
}
}
}

• Shubham

Thank you PrepInsta for publishing my code…