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Console flush() method in Java with Examples

  • Last Updated : 12 Jun, 2020

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()

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