CharArrayWriter reset() método en Java con ejemplos

El método reset() de la clase CharArrayWriter en Java se usa para restablecer el búfer para que pueda usarse nuevamente sin desechar el búfer ya asignado.
Sintaxis : 
 

public void reset()

Parámetros: Este método no acepta ningún parámetro.
Valor devuelto: este método no devuelve nada. 
El siguiente programa ilustra el método anterior: 
Programa 1: 
 

// Java program to illustrate
// the reset() method
 
import java.io.*;
 
public class GFG {
    public static void main(String[] args)
        throws IOException
    {
 
        // Initializing the character array
        char[] geek = { 'G', 'E', 'E', 'K', 'S' };
 
        // Initializing the CharArrayWriter
        CharArrayWriter char_array1
            = new CharArrayWriter();
 
        for (int c = 72; c < 77; c++) {
            // Use of write(int char)
            // Writer int value to the Writer
            char_array1.write(c);
        }
 
        // Use of size() method
        System.out.println("\nSize of char_array1 : "
                           + char_array1.size());
 
        // Resets the current stream
        char_array1.reset();
 
        // Use of size() method
        System.out.println("Size of char_array1 : "
                           + char_array1.size());
    }
}

Size of char_array1 : 5
Size of char_array1 : 0

Programa 2: 
 

// Java program to illustrate
// the reset() method
 
import java.io.*;
 
public class GFG {
    public static void main(String[] args)
        throws IOException
    {
 
        // Initializing the character array
        char[] geek
            = { 'G', 'O', 'P', 'A', 'L', 'L' };
 
        // Initializing the CharArrayWriter
        CharArrayWriter char_array1
            = new CharArrayWriter();
 
        for (int c = 72; c < 78; c++) {
            // Use of write(int char)
            // Writer int value to the Writer
            char_array1.write(c);
        }
 
        // Use of size() method
        System.out.println("\nSize of char_array1 : "
                           + char_array1.size());
 
        // Resets the current stream
        char_array1.reset();
 
        // Use of size() method
        System.out.println("Size of char_array1 : "
                           + char_array1.size());
    }
}

Size of char_array1 : 6
Size of char_array1 : 0

Referencia : https://docs.oracle.com/javase/10/docs/api/java/io/CharArrayWriter.html#reset()