Java - Writer write(char[] cbuf) method

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Description

The Java Writer write(char[] cbuf) method writes an array of characters.

Declaration

Following is the declaration for java.io.Writer.write(char[] cbuf) method.

 public void write(char[] cbuf) 

Parameters

cbuf − Array of characters to be written.

Return Value

This method does not return a value.

Exception

• IOException − If an I/O error occurs.

Example - Usage of Writer write(char[] cbuf) method

The following example shows the usage of Writer write(char[] cbuf) method.

WriterDemo.java

 package com.tutorialspoint; import java.io.IOException; import java.io.PrintWriter; import java.io.Writer; public class WriterDemo { public static void main(String[] args) { char[] c1 = {'h', 'e', 'l', 'l', 'o'}; char[] c2 = {'w', 'o', 'r', 'l', 'd'}; // create a new writer Writer writer = new PrintWriter(System.out); try { // write a char array writer.write(c1); // flush the writer writer.flush(); // write a new char array writer.write(c2); // flush the stream again writer.close(); } catch (IOException ex) { ex.printStackTrace(); } } } 

Output

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

 helloworld 

Example - Write a Substring from a String

The following example shows the usage of Writer write(char[] cbuf) method.

WriterDemo.java

 package com.tutorialspoint; import java.io.IOException; import java.io.StringWriter; import java.io.Writer; public class WriterDemo { public static void main(String[] args) throws IOException { Writer writer = new StringWriter(); String str = "WelcomeToJava"; writer.write(str, 7, 4); // Writes "ToJa" System.out.println("Output: " + writer.toString()); } } 

Output

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

 Output: ToJa 

Explanation

• The string "WelcomeToJava" has characters at index 7 to 10: 'T', 'o', 'J', 'a'.

• write(str, 7, 4) writes "ToJa" to the Writer.

Example - Extract and Write a Word

The following example shows the usage of Writer write(char[] cbuf) method.

WriterDemo.java

 package com.tutorialspoint; import java.io.IOException; import java.io.StringWriter; import java.io.Writer; public class WriterDemo { public static void main(String[] args) throws IOException { Writer writer = new StringWriter(); String sentence = "Java programming is powerful"; writer.write(sentence, 5, 11); // Writes "programming" System.out.println("Result: " + writer.toString()); } } 

Output

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

 Result: programming 

Explanation

• The string "Java programming is powerful" starts the word "programming" at index 5.

• Length = 11 → captures "programming".

• write(sentence, 5, 11) writes "programming" to the buffer.