The flush() method of PrintWriter Class in Java is used to flush the stream. By flushing the stream, it means to clear the stream of any element that may be or maybe not inside the stream. It neither accepts any parameter nor returns any value.
Syntax:
public void flush()
Parameters: This method do not accepts any parameter.
Return Value: This method do not returns any value. It just flushes the Stream.
Below methods illustrates the working of flush() method:
Program 1:
// Java program to demonstrate// PrintWriter flush() method  import java.io.*;  class GFG {    public static void main(String[] args)    {          // The string to be written in the Writer        String str = "GeeksForGeeks";          try {              // Create a PrintWriter instance            PrintWriter writer                = new PrintWriter(System.out);              // Write the above string to this writer            // This will put the string in the stream            // till it is printed on the console            writer.write(str);              // Now clear the stream            // using flush() method            writer.flush();        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
GeeksForGeeks
Program 2:
// Java program to demonstrate// PrintWriter flush() method  import java.io.*;  class GFG {    public static void main(String[] args)    {          try {              // Create a PrintWriter instance            PrintWriter writer                = new PrintWriter(System.out);              // Write the char to this writer            // This will put the char in the stream            // till it is printed on the console            writer.write(65);              // Now clear the stream            // using flush() method            writer.flush();        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
A
