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CharArrayWriter sample program in Java

By: Baski in Java Tutorials on 2022年09月15日 [フレーム]

CharArrayWriter is a class in Java that extends the Writer abstract class and provides a buffer to write characters into an internal buffer which can later be used to create a String.

Here's an example program that uses CharArrayWriter:

import java.io.CharArrayWriter;
import java.io.IOException;
public class CharArrayWriterExample {
 public static void main(String[] args) throws IOException {
 CharArrayWriter writer = new CharArrayWriter();
 String message = "Hello World!";
 writer.write(message);
 char[] buffer = writer.toCharArray();
 System.out.println(new String(buffer));
 writer.close();
 }
}

The above program creates an instance of CharArrayWriter, writes the string "Hello World!" to it, and then converts the written characters into a character array using the toCharArray() method. Finally, the character array is printed as a String.

CharArrayWriter has two constructors:

CharArrayWriter(): Creates a new CharArrayWriter with a default initial size of 32 characters.
CharArrayWriter(int initialSize): Creates a new CharArrayWriter with an initial buffer size of initialSize.

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