Java.io.Writer.append() Method

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Description

The java.io.Writer.append(CharSequence csq,int start,int end) method appends a subsequence of the specified character sequence to this writer. Appendable.

Declaration

Following is the declaration for java.io.Writer.append() method.

public Writer append(CharSequence csq,int start,int end)

Parameters

• csq − The character sequence to append. If csq is null, then the four characters "null" are appended to this writer.

• start − The index of the first character in the subsequence.

• end − The index of the character following the last character in the subsequence.

Return Value

This method returns this writer.

Exception

• IndexOutOfBoundsException − If start or end are negative, start is greater than end, or end is greater than csq.length().

• IOException − If an I/O error occurs.

Example

The following example shows the usage of java.io.Writer.append() method.

package com.tutorialspoint;

import java.io.*;

public class WriterDemo {
   public static void main(String[] args) {
      CharSequence csq = "Hello World!";

      // create a new writer
      Writer writer = new PrintWriter(System.out);

      try {
         // append a subsequence and change line
         writer.append("This is an example\n", 11, 19);

         // flush the writer
         writer.flush();

         // append a new subsequence
         writer.append(csq, 0, 5);

         // flush the writer to see the result
         writer.flush();

      } catch (IOException ex) {
         ex.printStackTrace();
      }
   }
}

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

example
Hello