Método charArrayWriter close() en Java con ejemplos

El método close() de la clase CharArrayWriter en Java se usa para cerrar el flujo actual. 
Sintaxis : 
 

public void close()

Parámetros: Este método no acepta ningún parámetro.
Valor de retorno: este método cierra el flujo actual. Sin embargo, no libera el búfer. 
El siguiente programa ilustra el método anterior: 
Programa 1: 
 

// Java program to illustrate
// the close() 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());
 
        // Close the current stream
        char_array1.close();
    }
}

Size of char_array1 : 5

Programa 2: 
 

// Java program to illustrate
// the close() 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());
 
        // Close the current stream
        char_array1.close();
    }
}

Size of char_array1 : 6

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