Java - CharArrayWriter append(char c) method

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Description

The Java CharArrayWriter append(char c) method is used to append a single character to the writer. Below is a simple example demonstrating its use.

Declaration

Following is the declaration for java.io.CharArrayWriter.append(char c) method −

public CharArrayWriter append(char c)

Parameters

c − 16-bit character to append.

Return Value

The CharArrayWriter instance itself, allowing method chaining.

Exception

NA

Example - Using CharArrayWriter append(char c)) method

The following example shows the usage of Java CharArrayWriter append(char c)) method.

CharArrayWriterDemo.java

package com.tutorialspoint;

import java.io.CharArrayWriter;

public class CharArrayWriterDemo {
   public static void main(String[] args) {      
      CharArrayWriter chw = null;
      
      // create buffer
      char[] ch = {'A','B','C','D','E','F'};
      
      try {
         // create new character array writer
         chw = new CharArrayWriter();
         
         // for each character in the buffer
         for(char c:ch) {
            // append character to the writer
            chw.append(c);
            
            // prints the character array as string
            System.out.println(chw.toString());
         }
      } catch(Exception e) {
         // for any exception
         e.printStackTrace();
      } finally {
         // closes the stream
         if(chw!=null)
            chw.close();
      }
   }
}

Output

Let us compile and run the above program, this will produce the following result −

A
AB
ABC
ABCD
ABCDE
ABCDEF

Example - Appending a Single Character to a CharArrayWriter

The following example shows the usage of Java CharArrayWriter append(char c) method.

CharArrayWriterDemo.java

package com.tutorialspoint;

import java.io.CharArrayWriter;

public class CharArrayWriterDemo {
   public static void main(String[] args) {
      // Creating a CharArrayWriter instance
      CharArrayWriter charArrayWriter = new CharArrayWriter();

      // Appending characters one by one
      charArrayWriter.append('H');
      charArrayWriter.append('i');
      charArrayWriter.append('!');

      // Converting the CharArrayWriter content to a string and displaying it
      System.out.println("CharArrayWriter content: " + charArrayWriter.toString());

      // Closing the CharArrayWriter (not necessary, but good practice)
      charArrayWriter.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

CharArrayWriter content: Hi!

Explanation

• A CharArrayWriter object is created.

• The append(char c) method is used to append individual characters: 'H', 'i', and '!'.

• The toString() method is called to retrieve and print the content stored in the CharArrayWriter.

Example - Using append(char c) in a Loop

The following example shows the usage of Java CharArrayWriter append(char c) method.

CharArrayWriterDemo.java

package com.tutorialspoint;

import java.io.CharArrayWriter;

public class CharArrayWriterDemo {
   public static void main(String[] args) {
      CharArrayWriter charArrayWriter = new CharArrayWriter();

      // Define a character array to append
      char[] characters = {'J', 'a', 'v', 'a'};

      // Append each character from the array using a loop
      for (char c : characters) {
         charArrayWriter.append(c);
      }

      // Display the final output
      System.out.println("Final content: " + charArrayWriter.toString());

      // Closing the CharArrayWriter
      charArrayWriter.close();
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Final content: Java

Explanation

• A CharArrayWriter is created.

• A character array {'J', 'a', 'v', 'a'} is defined.

• The append(char c) method is used inside a loop to append each character from the array.

• Finally, the stored content is displayed using toString().

These examples illustrate how the append(char c) method can be used to append single characters to a CharArrayWriter efficiently.