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Java PrintStream flush() Method with Example

PrintStream Class flush() method: Here, we are going to learn about the flush() method of PrintStream Class with its syntax and example.
Submitted by Preeti Jain, on April 19, 2020

PrintStream Class flush() method

• flush() method is available in java.io package.
• flush() method is used to flush this PrintWriter stream with the help of writing bytes to the underlying output stream of any buffered output then after flushing the stream.
• flush() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• flush() method does not throw an exception at the time of flushing the stream.

Syntax:

    public void flush();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is void, it returns nothing.

Example:

// Java program to demonstrate the example 
// of void flush() method of 
// PrintStream

import java.io.*;

public class FlushOfPS {
    public static void main(String[] args) {
        String str = "Java Programming";

        // Instantiates PrintStream
        PrintStream p_stm = new PrintStream(System.out);

        // Display str
        p_stm.println("str: " + str);

        // By using flush() method is to
        // flush the stream immediately
        p_stm.flush();
        System.out.println("Stream Flushed...");

        // By using close() method is to 
        // close the stream p_stm
        System.out.println("Stream Shutdown....");
        p_stm.close();
    }
}

Output

str: Java Programming
Stream Flushed...
Stream Shutdown....