Java Console flush() Method

The flush() method of Console class is used to flushes the console and forces any buffered output to be written immediately .

Syntax

Parameters

Return value:

This method does not return a value.

Example 1

import java.io.*;
    public class WriterDemo {
	   public static void main(String[] args) {
	      String s = "Hello ";

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

	      try {
	         // append a string
	         o.append(s);

	         // flush the writer
	            o.flush();

	         // append a new string in a new line
	           o.append("java code");

	         // flush the stream again
	           o.close();

	      } catch (IOException e) {
	    	  System.out.println(e);
	      }
	   }
	}

Output:

Hello java code

Example 2

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class flush {

	public static void main(String[] args) {	
		
		try {
			FileWriter fw = new FileWriter("E:\\users\\flushUsing.txt");
			// initialize our BufferedWriter
			BufferedWriter bw = new BufferedWriter(fw);
			System.out.println("Starting the write");
			// write values
			bw.write("The flush() primary usage is to flush the stream");
			bw.newLine();
			bw.write("IOException will be thrown if an I/O error occurs.");
			bw.newLine();
		    // flush the stream
			bw.flush();
			// close the BufferedWriter object to finish operation
			bw.close();
			System.out.println("Finished and close");
		} catch (IOException e) {
			
			System.out.println(e);
		}		
		
	}
}

Output: