In Java, we can use for loop, while loop or do-while loops to print different number, alphabet or star pattern programs.

Here are some examples for character or letter pattern programs. For other patterns, please refer the links at the end of the post.

Java Character Pattern Program 1:

A
BC
DEF
GHIJ
KLMNO

class CharPattern1 {
    public static void main(String[] args) {
        char ch = 'A';
        for (int i = 1; i <= 5; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(ch);
                ch++;
            }
            System.out.println();
        }
    }
}

 

Java Character Pattern Program 2:

Enter a String: 
LOTUS

L
LO
LOT
LOTU
LOTUS

import java.util.Scanner;

public class CharPattern2 {

  public static void main(String[] args) {
    System.out.println("Enter a String: ");
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        sc.close();
        
    char [] a=s.toCharArray();
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j <= i; j++) {
                System.out.print(a[j]);
            }
            System.out.println();
        }
  }

}

 

Java Character Pattern Program 3 : Diamond shape composed of Letters

Enter a Char between A to Z : G
      A
     B B
    C   C
   D     D
  E       E
 F         F
G           G
 F         F
  E       E
   D     D
    C   C
     B B
      A

package com.topjavatutorial;

import java.util.Scanner;

public class DiamondPattern {

  public static void main(String[] args) {
    char[] letter = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
        'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
        'W', 'X', 'Y', 'Z' };
    int letter_number = 0;

    // array of strings
    String[] diamond = new String[26];
    // get the letter
    System.out.print("Enter a Char between A to Z : ");

    Scanner reader = new Scanner(System.in);
    try {
      char user_letter = reader.next("[A-Z]").charAt(0);
      // search for letter number in the array letter
      for (int i = 0; i < letter.length; i++) {
        if (letter[i] == user_letter) {
          letter_number = i;
          break;
        }
      }

      // construct diamond

      for (int i = 0; i <= letter_number; i++) {
        diamond[i] = "";
        // add initial spaces
        for (int j = 0; j < letter_number - i; j++) {
          diamond[i] += " ";
        }

        // add letter (first time)
        diamond[i] += letter[i];

        // add space between letters
        if (letter[i] != 'A') {
          for (int j = 0; j < 2 * i - 1; j++) {
            diamond[i] += " ";
          }
          // add letter (second time)
          diamond[i] += letter[i];
        }
        // Draw the first part of the diamond as it's composing.
        System.out.println(diamond[i]);
      }

      for (int i = letter_number - 1; i >= 0; i--) {
        // Draw the second part of the diamond
        // Writing the diamondArray in reverse order.
        System.out.println(diamond[i]);
      }
    } catch (Exception e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } finally {
      reader.close();
    }

  }
}

 

Java Character Pattern Program 4:

Enter a String: 
APPLE

A
AP
APP
APPL
APPLE
APPL
APP
AP
A

import java.util.Scanner;

public class CharPattern4 {

  public static void main(String[] args) {
    System.out.println("Enter a String: ");
    Scanner sc = new Scanner(System.in);
    String s = sc.nextLine();
    sc.close();
    int length = s.length();
    char[] a = s.toCharArray();

    for (int i = 0; i < length; i++) {
      for (int j = 0; j < i; j++)
        System.out.print(a[j]);
      System.out.println();
    }
    for (int i = length; i >= 0; i--) {
      for (int j = 0; j < i; j++)
        System.out.print(a[j]);
      System.out.println();
    }

  }

}

 

Java Character Pattern Program 5:

Enter a String: 
HELLO

Printing the pattern: 

HELLO
HELL
HEL
HE
H

import java.util.Scanner;

public class CharPattern {

  public static void main(String[] args) {
    System.out.println("Enter a String: ");
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        sc.close();
        int length= s.length();
        
    char [] a=s.toCharArray();
    
    System.out.println("\nPrinting the pattern: ");
    
        for (int i = length-1; i >= 0; i--) {
            for (int j = 0; j <= i; j++) {
                System.out.print(a[j]);
            }
            System.out.println();
        }

  }
}

 

Java Character Pattern Program 6:

      A
     BBB
    CCCCC
   DDDDDDD
  EEEEEEEEE
 FFFFFFFFFFF
GGGGGGGGGGGGG

public class CharPattern {

  public static void main(String[] args) {

        char ch = 'A';
        
        int number = 7;
        int count = number - 1;
        for (int k = 1; k <= number; k++) {
            for (int i = 1; i <= count; i++)
                System.out.print(" ");
            count--;
            for (int i = 1; i <= 2*k-1; i++)
                System.out.print(ch);
            System.out.println();
            ch++;
        }

  }

}

 

Java Character Pattern Program 7:

    A
   BBB
  CCCCC
 DDDDDDD
EEEEEEEEE
 DDDDDDD
  CCCCC
   BBB
    A

public class CharPattern7 {

  public static void main(String[] args) {
    char ch = 'A';
    int number = 5;
        int count = number - 1;
        for (int k = 1; k <= number; k++) {
            for (int i = 1; i <= count; i++)
                System.out.print(" ");
            count--;
            for (int i = 1; i <= 2 * k - 1; i++)
                System.out.print(ch);
            System.out.println();
            ch++;
        }
        count = 1;
        ch--;
        for (int k = 1; k <= number - 1; k++) {
            for (int i = 1; i <= count; i++)
                System.out.print(" ");
            count++;
            ch--;
            for (int i = 1; i <= 2 * (number - k) - 1; i++)
                System.out.print(ch);
            System.out.println();
        }

  }

}

 

Java Character Pattern Program 8:

      A
     BB
    CCC
   DDDD
  EEEEE
 FFFFFF
GGGGGGG

public class CharPattern8 {

  public static void main(String[] args) {
        char ch = 'A';       
        int number = 7;
        int count = number - 1;
        for (int k = 1; k <= number; k++) {
            for (int i = 1; i <= count; i++)
                System.out.print(" ");
            count--;
            for (int i = 1; i <= k; i++)
                System.out.print(ch);
            System.out.println();
            ch++;
        }
  }

}

 

Java Character Pattern Program 9:

A
BA
CBA
DCBA

public class CharPattern9 {
  public static void main(String[] args) {
    String str = "ABCD";
    char[] chr = str.toCharArray();
    for (int i = 0; i < chr.length; i++) {

      for (int k = i; k >= 0; k--) {
        System.out.print(chr[k]);
      }

      System.out.println();
    }

  }
}

 

Java Character Pattern Program 10:

EDCBA
DCBA
CBA
BA
A

public class CharPattern10 {
  public static void main(String[] args) {
    String str = "ABCDE";
    char[] chr = str.toCharArray();
    for (int i = chr.length-1; i >= 0; i--) {

      for (int k = i; k >= 0; k--) {
        System.out.print(chr[k]);
      }

      System.out.println();
    }

  }
}

 

N.B.

We are still adding more letter/character pattern programs to this article. If you would like to see any other programs, please add in the comments section and we will be happy to add them here.

Also, here are some of the other pattern programs you may like:
 

• 10 Number Pattern Programs
• 8 Star(*) Pattern Programs

 

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