Diamond number pattern in Java language

In this tutorial, we will discuss a simple concept of the diamond number pattern in Java language

In this post, we will learn how to create diamond number patterns using loops.

We can use for loop, while loop or do while loop to display different diamond patterns in Java programming language.

Here, we will use for loop to print different diamond patterns

Program 1

Diamond pattern 1

import java.util.Scanner;
class DoubleNumber2{
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(" ");//print space
}
for(int k=i; k>=1; k--){
      System.out.print(k);
}
for(int l=2; l<=i; l++){
      System.out.print(l);
}
System.out.println();//move to next line
}

for(int i=rows-1; i>=1; i--){  //print lower part
    for(int j=0; j<=rows-1-i; j++){
      System.out.print(" ");//print space
}
for(int k=i; k>=1; k--){
      System.out.print(k);
}
for(int l=2; l<=i; l++){
      System.out.print(l);
}
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
        212
      32123
    4321234
  543212345
65432123456
  543212345
    4321234
      32123
        212
          1

Program 2

Diamond pattern 2

import java.util.Scanner;
class DoublePyramid4{
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(" ");//print space
}
for(int k=1; k<=i; k++){
      System.out.print(k+" ");
}
System.out.println();//move to next line
}

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+" ");
}
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

Program 3

Diamond pattern 3

import java.util.Scanner;
class DiamondNumber3{
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;

for(int i=rows/2; i>0; i--){    //print upper part
    for(int j=1; j<=i; j++){
      System.out.print(" ");//print space 
}
for(int j=1; j<=row; j++){
      System.out.print(row+" ");
}
System.out.println();//move to next line
row++;
}

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

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

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

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