Console flush() method in Java with Examples

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

Syntax:

public void flush()

Specified By: This method is specified by flush() method of Flushable interface.

Parameters: This method does not accept any parameter.

Return value: This method does not return any value.

Exceptions: This method does not any throw exception.

Note: System.console() returns null in an online IDE.

Below programs illustrate flush() method in Console class in IO package:

Program 1:

// Java program to illustrate
// Console flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();

        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }
        String str = cnsl.readLine(
            "Enter string : ");

        System.out.println(
            "You entered : " + str);

        // Revoke flush() method
        cnsl.flush();
    }
}

Output:

Program 2:

// Java program to illustrate
// Console flush() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();

        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }
        String str = cnsl.readLine(
            "Enter string : ");

        System.out.println(
            "You entered : " + str);

        // Revoke flush() method
        cnsl.flush();
    }
}

Output:

References:
https://docs.oracle.com/javase/10/docs/api/java/io/Console.html#flush()