Java program to Display diamond number pattern using while loop

Karmehavannan

6 years ago

Java program to Display diamond number pattern using while loop

In this tutorial, we will discuss the concept of Java program to Display diamond number pattern using while loop

In this post, we will learn about how to print diamond number pattern using while loop in Java language.

We can use for loop, while loop or do while loop to display different diamond Number patterns.

Here, we will use while loop to print diamond Number patterns in Java language

The following Java program requests the user to enter the number of rows as the user wanted and the program will display the number of rows in diamond number pattern according to the user input

Program 1

Diamond number pattern 1

import java.util.Scanner;
class DiamondNumberWhile1{
public static void main (String args[]){

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number of rows: ");
int rows=scan.nextInt();//reads rows from user
int row=1;
int i=rows/2;
while( i>0){    //print upper part
int j=1; 
    while(j<=i){
      System.out.print(" ");//print space
       j++;
}
   j=1; 
while(j<=row){
      System.out.print(row+" ");
       j++;
}
System.out.println();//move to next line
row++;
 i--;
}

i=0;
while( i<=rows/2){ //print lower part
    int j=1; 
  while (j<=i){
      System.out.print(" ");//print space
       j++;
}

j=row;
while( j>=1){ 
      System.out.print(row+" ");//print number
       j--;
}
System.out.println();//move to next line
row--;
 i++;
        }
    }
}

When the above code is executed, it produces the following result

Enter the number of rows: 8
        
             1
          2   2
       3   3   3
     4  4   4   4
  5  5   5   5   5
     4  4   4   4  
       3   3   3
          2   2
             1

Program 2

Diamond number pattern 2

import java.util.Scanner;
class DiamondNumberWhile2{
public static void main (String args[]){

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number of rows: ");
int rows=scan.nextInt();//reads rows from user
int i=1; 
while(i<=rows){ 
int j=1;    //print upper part
    while(j<=rows-i){
      System.out.print(" ");//print space
       j++;
}
int k=i; 
while(k>=1){
      System.out.print(k);//print number
       k--;
}
int l=2; 
while(l<=i){
      System.out.print(l);//print number
       l++;
}
System.out.println();
 i++;
}

i=rows-1; 
while(i>=1){  //print lower part
    for(int j=0; j<=rows-1-i; j++){
      System.out.print(" ");//print space
}
int k=i; 
while(k>=1){
      System.out.print(k);
       k--;
}
int l=2; 
while(l<=i){
      System.out.print(l);
       l++;
}
System.out.println();
 i--;
        }
    }
}

When the above code is executed, it produces the following result

Enter the number of rows: 6
          1
        212
      32123
    4321234
  543212345
65432123456
  543212345
    4321234
      32123
        212
          1

Program 3

Diamond number pattern 3

import java.util.Scanner;
class DiamondNumberWhile3{
public static void main (String args[]){

Scanner scan=new Scanner(System.in);
//create a scanner object for input

System.out.print("Enter the number of rows: ");
int rows=scan.nextInt();//reads rows from user
for(int i=1; i<=rows; i++){    //print upper part
    for(int j=1; j<=rows-i; j++){
      System.out.print(" ");
}
for(int k=1; k<=i; k++){
      System.out.print(k+" ");//print number with space to upper part
}
System.out.println();
}

for(int i=1; i<=rows-1; i++){  //print lower part
    for(int j=1; j<=i; j++){
      System.out.print(" ");//print space
}
for(int k=1; k<=rows-i; k++){
      System.out.print(k+" ");//print number with space to lower part
} 
System.out.println();//move to next line
        }
    }
}

When the above code is executed, it produces the following result

Enter the number of rows: 6
         1
       1  2
     1  2  3
   1  2  3  4
  1  2  3  4  5
1  2  3  4  5  6
  1  2  3  4  5
    1  2  3  4
      1  2  3 
        1  2
          1

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