Java - Writer append(char c) method

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Description

The Java Writer append(char c) method appends the specified character to this writer.

Declaration

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

public Writer append(char c)

Parameters

c − The 16-bit character to append.

Return Value

This method returns the current writer.

Exception

IOException − If an I/O error occurs.

Example - Usage of Writer append(char c) method

The following example shows the usage of Writer append(char c) 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 c = 'A';

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

      try {
         // append a char
         writer.append('c');

         // append a new char
         writer.append(c);

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

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

Output

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

cA

Example - Using StringWriter to Append Characters

The following example shows the usage of Writer append(char c) method.

WriterDemo.java

package com.tutorialspoint;

import java.io.StringWriter;

public class WriterDemo {
   public static void main(String[] args) {
      StringWriter writer = new StringWriter();
      writer.append('H');
      writer.append('i');
      writer.append('!');

      System.out.println("Output: " + writer.toString());
   }
}

Output

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

Output: Hi!

Explanation

• Each append(char) call adds a single character.

• "H" + "i" + "!" = "Hi!" is stored in the writer.

Example - Append Characters in a Loop

The following example shows the usage of Writer append(char c) method.

WriterDemo.java

package com.tutorialspoint;

import java.io.StringWriter;

public class WriterDemo {
   public static void main(String[] args) {
      StringWriter writer = new StringWriter();
      char[] chars = {'J', 'A', 'V', 'A'};

      for (char ch : chars) {
         writer.append(ch);
      }

      System.out.println("Result: " + writer.toString());
   }
}

Output

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

Result: JAVA

Explanation

• A loop appends each character in the array to the StringWriter.

• The final string becomes "JAVA".