Java - CharArrayWriter write(char[] c, int off, int len) method

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Description

The Java CharArrayWriter write(char[] c, int off, int len) method writes portion of the specified character buffer to the writer.

Declaration

Following is the declaration for java.io.CharArrayWriter.write(char[] c, int off, int len) method −

 public void write(char[] c, int off, int len) 

Parameters

• c − The character buffer.

• off − Offset from which to start reading characters.

• len − Number of chars to write.

Return Value

The method does not return any value.

Exception

NA

Example - Usage of write() method

The following example shows the usage of Java CharArrayWriter write(char[] c, int off, int len) method.

CharArrayWriterDemo.java

 package com.tutorialspoint; import java.io.CharArrayWriter; public class CharArrayWriterDemo { public static void main(String[] args) { char[] ch = {'A','B','C','D','E'}; CharArrayWriter chw = null; try { // create character array writer chw = new CharArrayWriter(); System.out.println("off = 3; len = 2"); // write character buffer to the writer chw.write(ch, 3, 2); // get buffered content as string String str = chw.toString(); // print the string System.out.print(str); } catch(Exception e) { // for any error e.printStackTrace(); } finally { // releases all system resources from writer if(chw!=null) chw.close(); } } } 

Output

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

 off = 3; len = 2 DE 

Example - Writing a Portion of a Character Array

The following example shows the usage of Java CharArrayWriter write(char[] c, int off, int len) method. This example writes a subset of a character array to the CharArrayWriter and prints the result.

CharArrayWriterDemo.java

 package com.tutorialspoint; import java.io.CharArrayWriter; public class CharArrayWriterDemo { public static void main(String[] args) { // Creating CharArrayWriter instance CharArrayWriter writer = new CharArrayWriter(); // Character array to be written char[] data = {'H', 'e', 'l', 'l', 'o', ' ', 'J', 'a', 'v', 'a'}; // Writing a subset of the array (from index 6, 4 characters: "Java") writer.write(data, 6, 4); // Converting to string and displaying the result System.out.println("Written Output: " + writer.toString()); // Closing the writer (optional) writer.close(); } } 

Output

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

 Written Output: Java 

Explanation

• A CharArrayWriter instance is created.

• A character array {'H', 'e', 'l', 'l', 'o', ' ', 'J', 'a', 'v', 'a'} is initialized.

• The write(char[] cbuf, int off, int len) method is used to write a portion of the array starting at index 6 ('J') and writing 4 characters ("Java").

• The written content is printed as "Java".

Example - Writing Multiple Subsets of a Character Array

The following example shows the usage of Java CharArrayWriter write(char[] c, int off, int len) method. This example demonstrates writing multiple portions of a character array into the CharArrayWriter.

CharArrayWriterDemo.java

 package com.tutorialspoint; import java.io.CharArrayWriter; public class CharArrayWriterDemo { public static void main(String[] args) { // Creating CharArrayWriter instance CharArrayWriter writer = new CharArrayWriter(); // Character array to be written char[] data = {'W', 'e', 'l', 'c', 'o', 'm', 'e', ' ', 't', 'o', ' ', 'J', 'a', 'v', 'a'}; // Writing the first word "Welcome" (0 to 7) writer.write(data, 0, 7); // Writing " Java" (11 to 4 characters) writer.write(data, 11, 4); // Converting to string and displaying the result System.out.println("Written Output: " + writer.toString()); // Closing the writer (optional) writer.close(); } } 

Output

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

 Written Output: WelcomeJava 

Explanation

• A CharArrayWriter instance is created.

• A character array {'W', 'e', 'l', 'c', 'o', 'm', 'e', ' ', 't', 'o', ' ', 'J', 'a', 'v', 'a'} is initialized.

• The first word "Welcome" (indices 0 to 6, length 7) is written.

• The word "Java" (starting from index 11, length 4) is appended.

• The output "Welcome Java" is printed.