14 Pattern/ Pyramid generation programs in java




Contents of page >
  • Pattern/ Pyramid 1 in java
  • Pattern/ Pyramid 2 in java
  • Pattern/ Pyramid 3 in java
  • Pattern/ Pyramid 4 in java
  • Pattern/ Pyramid 5 in java
  • Pattern/ Pyramid 6 in java
  • Pattern/ Pyramid 7 in java
  • Pattern/ Pyramid 8 in java
  • Pattern/ Pyramid 9 in java
  • Pattern/ Pyramid 10 in java
  • Pattern/ Pyramid 11 in java
  • Pattern/ Pyramid 12 in java
  • Pattern/ Pyramid 13 in java
  • Pattern/ Pyramid 14 in java

Pattern/ Pyramid 1 in java

Write a program to generate this Pattern/pyramid in java.


Must read:  Merge sort.
                         LinkedHashMap Custom implementation in java.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid1 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = 1; i <= n; i++) {
                 for (int j = 1; j <= i; j++) {
                       System.out.print(j);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
1
12
123
1234
12345
*/

Pattern/ Pyramid 2 in java
Write a program to generate this Pattern in java.



Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid2 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = 1; i <= n; i++) {
                 for (int j = 1; j <= i; j++) {
                       System.out.print(i);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
1
22
333
4444
55555
*/




Pattern/ Pyramid 3 in java
Write a program to generate this Pattern in java.


Must read:   Permutation of string using recursion in java.
                            HashMap Custom implementation in java.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid3 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = n; i >0; i--) {
                 for (int j = 1; j <= i; j++) {
                       System.out.print(j);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
12345
1234
123
12
1
*/


Pattern/ Pyramid 4 in java
Write a program to generate this Pattern/pyramid in java.



Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid4 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = n; i >0; i--) {
                 for (int j = n,k=1; k <= i; j++,k++) {
                       System.out.print(j);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
56789
5678
567
56
5
*/




Pattern/ Pyramid 5 in java
Write a program to generate this Pattern in java.



Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid5 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = n; i >0; i--) {
                 for (int j = n,k=1; k <= i; j--,k++) {
                       System.out.print(j);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
54321
5432
543
54
5
*/



Pattern/ Pyramid 6 in java
Write a program to generate this Pattern/pyramid in java.


                     HashMap Custom implementation.  

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid6 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = n; i >0; i--) {
                 for (int j = i,k=1; k <= i; j--,k++) {
                       System.out.print(j);
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
54321
4321
321
21
1
*/




Pattern/ Pyramid 7 in java
Write a program to generate this Pattern in java.


Must read:     Reverse String.
                              Factorial using recursion.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid7Floyds {
   public static void main(String[] args) {
    
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter rows in Floyd's triangle : ");
          int rows = scanner.nextInt();
          System.out.println("");
          int nextNumber = 1;
          for (int i = 1; i <= rows; i++) {
                 for (int j = 1; j <= i; j++) {
                       System.out.print(nextNumber<10 ? ("  " + nextNumber++) : (" " + nextNumber++) ); //2spaces in single digit & 1 space in double digit.
                       //System.out.format("%3d",nextNumber++ ); //You may use this line for formatting as a replacement of above line. (comment above line before using this)
                 }
                 System.out.println();
          }
         
   }
}
/*OUTPUT
Enter rows in Floyd's triangle : 5
 1
 2  3
 4  5  6
 7  8  9 10
11 12 13 14 15
*/



Pattern/ Pyramid 8 in java
Write a program to generate this Pascal’s triangle in java.


>Each number present in row is sum of the left & right number in the above row.
>If there is no number in number in above, number is assumed as 0 in java.

>First and last number in row is always 1.
>Sum of numbers in each row is equal to sum of numbers in above row.

Must read:  Quick Sort.  

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
/*
*/
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid8Pascal {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter no of rows in Pascal's triangle : ");
          int rows = scanner.nextInt();
          int nextNumber;
          System.out.println("");
          for (int i = 0; i < rows; i++) {
                 nextNumber = 1;
                
                 for(int k=0; k<(rows-i)*2; k++)   //create (rows-i)*2  spaces, for initial spacing.
                       System.out.print(" ");
                
                 for (int j = 0; j <= i; j++) {
                       System.out.format("%4d", nextNumber); // %4d creates 4 space between number.
                       nextNumber = nextNumber * (i - j) / (j + 1);
                 }
                 System.out.println();
          }
   }
}
/* OUTPUT
Enter no of rows in Pascal's triangle : 6
                 1
               1   1
           1   2   1
          1   3   3   1
        1   4   6   4   1
     1   5  10  10   5   1
*/




Pattern/ Pyramid 9 in java
Write a program to generate this Pattern/pyramid in java.


                           Factorial using recursion.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid9Double {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = 1; i <= n; i++) { //it will create upper half
                 for (int j = 1; j <= i; j++) {
                       System.out.print(" *");
                 }
                 System.out.println("");
          }
          for (int i = n; i > 0; i--) { //it will create lower half
                 for (int j = 1; j <=i; j++) {
                       System.out.print(" *");
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 4
*
**
***
****
****
***
**
*
*/


Pattern/ Pyramid 10 in java
Write a program to generate this Pattern in java.


Must read:   Merge Sort.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid10 {
   public static void main(String[] args) {
          int j;
          int rows = 8;
          for (int i = 1; i <= rows; i++) {
                 for (j = 1; j <= rows - i; j++)   // for initial spacing.
                       System.out.print(" ");
                 for (int k = j + 1; k <= rows; k++) //creates left half.
                       System.out.print("*");
                
                 for (int k = rows; k > j - 1; k--)//creates right half.
                       System.out.print("*");
                
                 System.out.println();
          }
   }
}
/*OUTPUT
   *
     ***
    *****
   *******
  *********
 ***********
*************
***************
*/




Pattern/ Pyramid 11 in java
Write a program to generate this Pattern in java.



Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid11 {
   public static void main(String[] args) {
          int rows = 8;
          for (int i = 1; i <= rows; i++) {
                 for (int j = 1; j <= (rows - i)*2; j++) //create initial spacing.
                       System.out.print(" ");
                
                 for (int k = i; k >= 1; k--) //creates left half.
                       System.out.print(" "+ k);
                
                 for (int k = 2; k <= i; k++)//creates right half.
                       System.out.print(" "+ k);
                
                 System.out.println();
          }
   }
}
/*OUTPUT
           1
         2 1 2
        3 2 1 2 3
     4 3 2 1 2 3 4
   5 4 3 2 1 2 3 4 5
    6 5 4 3 2 1 2 3 4 5 6
  7 6 5 4 3 2 1 2 3 4 5 6 7
8 7 6 5 4 3 2 1 2 3 4 5 6 7 8
*/



Pattern/ Pyramid 12 in java
Write a program to generate this Pattern in java.


                             LinkedHashMap Custom implementation.

Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid12 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = 1; i <= n; i++) {
                 int k=i;
                 for (int j = 1; j <= n; j++) {
                       System.out.print((j<= n-i  ? " " : k--));                                               
                 }
                 System.out.println();
          }
   }
}
/*OUTPUT
Enter n : 5
   1
  21
 321
4321
54321
*/



Pattern/ Pyramid 13 in java

Write a program to generate this Pattern in java.



Example / Full Program/SourceCode to generate Pattern/ Pyramid in java >
package pyramid;
import java.util.Scanner;
/** Copyright (c), AnkitMittal  JavaMadeSoEasy.com */
public class Pyramid13 {
   public static void main(String[] args) {
         
          Scanner scanner = new Scanner(System.in);
          System.out.print("Enter n : ");  
          int n = scanner.nextInt();
          System.out.println("");
          for (int i = 1; i <= n; i++) {
                 int k=i;
                 for (int j = 1; j <= n; j++) {
                       if(j<i)
                              System.out.print(" ");
                       else
                              System.out.print(k++);                             
                 }
                 System.out.println("");
          }
   }
}
/*OUTPUT
Enter n : 5
12345
2345
 345
  45
   5
*/


Pattern/ Pyramid 14 in java

Write a program to generate this Pattern in java.


We will be using jagged array to generate such pyramid.

Example / Program to generate above pattern in java >
/** JavaMadeSoEasy.com */
public class Pyramid14 {
   public static void main(String... args) {
          int ar[][] = new int[5][]; //jagged array
          int start = 0;
          int prev = 0;
          int sum = 1; // keep initial sum as 0
          for (int i = 0; i < ar.length; i++) {
                 ar[i] = new int[i + 1];
                 prev = 0;
                 for (int j = 0; j < ar[i].length; j++) {
                       if (i > 0 && j > 0) {
                              prev = ar[i][j - 1];
                              start = ar[i - 1][j - 1];
                              sum = start + prev;
                              ar[i][j] = sum;
                       } else {
                              ar[i][j] = sum;
                       }
                       System.out.print(sum + " ");
                 }
                 start = sum; // assign sum to start
                 System.out.println(); // for new line
          } // end for loop
   }
}
/*
1
1 2
2 3 5
5 7 10 15
15 20 27 37 52
*/



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