java.io.CharArrayWriter class creates a character buffer that can be used as a writer. The buffer automatically grows when data is written to the stream. The data can be retrieved using toCharArray() and toString().
Declaration:
public class CharArrayWriter
extends Writer
Constructor :
- CharArrayWriter() : Creating a CharArrayWriter from a specified character array.
- CharArrayWriter(int size) : Creating a CharArrayWriter with the specified initial size.
Methods:
- write(int char) : java.io.CharArrayWriter.write(int char) writes a single character to the Writer.
Syntax:
public void write(int char)
Parameters :
char : int value of the character to be written.
Return :
void
- write(String str, int offset, int maxlen) : java.io.CharArrayWriter.write(String str, int offset, int maxlen) writes some part of the string to the Writer.
Syntax:
public void write(String str, int offset, int maxlen)
Parameters :
str : string to be written to the Writer.
offset : start position of the String
maxlen : maximum length upto which string has to written
Return :
void
- write(char[] carray, int offset, int maxlen) : java.io.CharArrayWriter.write(char[] carray, int offset, int maxlen) writes some part of the character array to the Writer.
Syntax:
public void write(char[] carray, int offset, int maxlen)
Parameters :
carray : character to be written to the Writer
offset : start position of the character array
maxlen : maximum no. of the character of the carray has to written
Return :
void
- writeTo(Writer out_stream) : java.io.CharArrayWriter.writeTo(Writer out_stream) writes content of the buffer to another specified stream.
Syntax :
public void writeTo(Writer out_stream)
Parameters :
out_stream : destination stream to be write into
Return :
void
Exception :
IOException : In case of I/O error occurs
- toString() : java.io.CharArrayWriter.toString() returns buffer content as a string from the Writer.
Syntax:
public String toString()
Parameters :
-----------
Return :
returns buffer content as a string from the Writer.
- close() : java.io.StringWriter.close() closes the Writer stream but doesn’t release the buffer
Syntax:
public void close()
Parameters :
-----------
Return :
void
- size() : java.io.StringWriter.size() returns the current size of the buffer as an integer value.
Syntax:
public int size()
Parameters :
-----------
Return :
integer value representing the current size of the buffer.
Java code explaining use of CharArrayWriter class methods
Java
// Java program illustrating the working of CharArrayWriter class methods// write(int char), toString(), write(char[] carray, int offset, int maxlen)// write(String str, int offset, int maxlen), size()import java.io.*;public class NewClass{ public static void main(String[] args) throws IOException { // Initializing the character array char[] geek = {'G', 'E', 'E', 'K', 'S'}; String geek_str; // Initializing the CharArrayWriter CharArrayWriter char_array1 = new CharArrayWriter(); CharArrayWriter char_array2 = new CharArrayWriter(); CharArrayWriter char_array3 = 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 toString() : returning Buffer content as String geek_str = char_array1.toString(); System.out.println("Using write(int char) : "+ geek_str); // Use of write(String str, int offset, int maxlen) // writes some part of the string to the Writer. char_array2.write(geek_str, 2, 3); System.out.println("write(str, offset, maxlen) : "+ char_array2.toString()); // Use of write(char[] carray, int offset, int maxlen) // writes some part of the Char[] geek to the Writer char_array3.write(geek, 2, 3); System.out.println("write(carray, offset, maxlen) : "+ char_array3.toString()); // get buffered content as string String str = char_array3.toString(); // Use of writeTo(Writer out_stream) char_array3.writeTo(char_array1); System.out.println("\nchar_array3 to char_array1 : "+ char_array1.toString()); // Use of size() method System.out.println("\nSize of char_array1 : "+ char_array1.size()); System.out.println("Size of char_array1 : "+ char_array2.size()); System.out.println("Size of char_array1 : "+ char_array3.size()); }} |
Output :
Using write(int char) : HIJKL
write(str, offset, maxlen) : JKL
write(carray, offset, maxlen) : EKS
char_array3 to char_array1 : HIJKLEKS
Size of char_array1 : 8
Size of char_array1 : 3
Size of char_array1 : 3
Next Article: Java.io.CharArrayWriter class in Java | Set2
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