Generate hollow diamond star pattern in Java

Generate hollow diamond star pattern in Java

In this tutorial, we will discuss Generate hollow diamond star pattern in Java

Hollow diamond star pattern using for loop

In this program, we are going to learn how to display  hollow diamond star pattern  using for loop  in Java  programming language

Here, we display a hollow diamond star pattern program with coding using nested for loop and also we get input from the user using Scanner class in Java language.

The user can provide numbers as they wish and get the hollow diamond star pattern according to their input.

Program 1

import java.util.Scanner;
class HollowDiamondStarPattern{
public static void main(String args[]){
int i,j;
Scanner scan=new Scanner(System.in);
System.out.print("Enter the number of rows: ");

int rows=scan.nextInt();//get input from user
//loop for display upper half part of the pattern
for(i=1; i<=rows; i++){
    for(j=i; j<=rows; j++){
       System.out.print("*");//print star
    }

    for(j=1; j<=(2*i-2); j++){
       System.out.print(" ");//print space
    }
    for(j=i; j<=rows; j++){
       System.out.print("*");//print star
    }
    System.out.print("\n");
}
    //loop for printing lower half part  of the pattern
for(i=1; i<=rows; i++){
    for(j=1; j<=i; j++){
       System.out.print("*");//print star
    }
    
    for(j=(2*i-2); j<(2*rows-2); j++){
       System.out.print(" ");//print space
    }
    for(j=1; j<=i; j++){
       System.out.print("*");
    }
    System.out.print("\n");//move to next line
    }
    }
    }

When the above code executed, it produces the following results

Enter the number of rows: 6
************
*****    *****
****        ****
***            ***
**                **
*                    *
**                **
***            ***
****        ****
*****    *****
************

Hollow diamond star pattern using while loop

In this program, we are going to learn how to display  hollow diamond star pattern using while loop or  in Java programming language

Here, we display a hollow diamond star pattern program with coding using nested while loop and also we get input from the user using Scanner class  in Java  language

The user can provide numbers as they wish and get the  hollow diamond star pattern according to their input

Program 2

import java.util.Scanner;
class HollowDiamondStarPattern1{
public static void main(String args[]){
int i,j;
Scanner scan=new Scanner(System.in);
System.out.print("Enter the number of rows: ");

int rows=scan.nextInt();//get input from user
//loop for display upper half part of the pattern
i=1; 
while(i<=rows){
j=i; 
    while(j<=rows){
       System.out.print("*");//print star
        j++;
    }
j=1; 
    while(j<=(2*i-2)){
       System.out.print(" ");//print space
        j++;
    }
    j=i; 
    while(j<=rows){
       System.out.print("*");//print star
        j++;
    }
    System.out.print("\n");
     i++;
}
    //loop for printing lower half part  of the pattern
    i=1; 
while(i<=rows){
j=1; 
    while(j<=i){
       System.out.print("*");//print star
        j++;
    }
    j=(2*i-2); 
    while(j<(2*rows-2)){
       System.out.print(" ");//print space
        j++;
    }
    j=1; 
    while(j<=i){
       System.out.print("*");
        j++;
    }
    System.out.print("\n");//move to next line
     i++;
    }
    }
    }

When the above code executed, it produces the following results

Enter the number of rows: 6
************
*****    *****
****        ****
***            ***
**                **
*                    *
**                **
***            ***
****        ****
*****    *****
************

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