Java program to display hollow diamond star pattern

In this tutorial, we will discuss the concept of Java program to display hollow diamond star pattern

In this program, we are going to learn how to displayed 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.

Display binary Hollow diamond star pattern using for loop

Program 1

import java.util.Scanner;
class HollowDiamondPattern{
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

//print upper triangle
for(i=1; i<=rows; i++){
    for(j=rows; j>i; j--){
       System.out.print(" ");//print space
    }
    System.out.print("*");  //print star
    for(j=1; j<(i-1)*2; j++){
       System.out.print(" ");
    }
    if(i==1){
      System.out.print("\n");//move to next line
    }
    else{
      System.out.print("*\n");
    }
}
    //print lower triangle
for(i=rows-1; i>=1; i--){
    for(j=rows; j>i; j--){
       System.out.print(" ");
    }
    System.out.print("*");
    for(j=1; j<(i-1)*2; j++){
       System.out.print(" ");
    }
    if(i==1){
      System.out.print("\n");
    }
    else{
      System.out.print("*\n");
    }
    }
    }
    }

When the above code executed, it produces the following results

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

Display binary Hollow diamond star pattern using while loop

In this program, we are going to learn how to displayed 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 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 HollowDiamondPattern1{
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();
i=1; 

//print upper triangle
while(i<=rows){
    j=rows;
    while( j>i){
       System.out.print(" ");
        j--;
    }
    System.out.print("*");
    j=1; 
    while(j<(i-1)*2){
       System.out.print(" ");
        j++;
    }
    if(i==1){
      System.out.print("\n");
    }
    else{
      System.out.print("*\n");
    }
     i++;
}

//print lower triangle
    
    i=rows-1; 
while(i>=1){
    j=rows; 
    while(j>i){
       System.out.print(" ");//print space
        j--;
    }
    System.out.print("*");//print star
    j=1; 
    while(j<(i-1)*2){
       System.out.print(" ");
        j++;
    }
    if(i==1){
      System.out.print("\n");//move to next line
    }
    else{
      System.out.print("*\n");
    }
     i--;
    }
    }
    }

When the above code executed, it produces the following results

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

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