Java.io.FilterWriter.flush() Method

Description

The java.io.FilterWriter.flush() method flushes out the string .

Declaration

Following is the declaration for java.io.FilterWriter.flush() method:

public void flush()

Parameters

• NA

Return Value

The method does not return any value.

Exception

• IOException -- If an I/O error occurs.

Example

The following example shows the usage of java.io.FilterWriter.flush() method.

package com.tutorialspoint;

import java.io.FilterWriter;
import java.io.StringWriter;
import java.io.Writer;

public class FilterWriterDemo {
   public static void main(String[] args) throws Exception {
      
      FilterWriter fw = null;
      Writer w = null;
      String s=null;
      
      try{
         // create new reader
         w = new StringWriter(6);
          
         // filter writer
         fw = new FilterWriter(w) {
         };
         
         // write to filter writer
         fw.write(65);

         // flushes the content
         fw.flush();
         System.out.println("flush() invoked");
         System.out.println("flushes content to the writer");

         // get the string
         s = w.toString();
         
         // print
         System.out.print("String: "+s);
         
      }catch(Exception e){
         
         // if any I/O error occurs
         e.printStackTrace();
      }finally{
         
         // releases system resources associated with this stream
         if(w!=null)
            w.close();
         if(fw!=null)
            fw.close();
      }
   }
}

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

flush() invoked
flushes content to the writer
String: A