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PrintStream flush() method in Java with Examples

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  • Last Updated : 31 Jan, 2019

The flush() method of PrintStream 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
// PrintStream flush() method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // The string to be written in the Stream
        String str = "GeeksForGeeks";
  
        try {
  
            // Create a PrintStream instance
            PrintStream stream
                = new PrintStream(System.out);
  
            // Write the above string to this stream
            // This will put the string in the stream
            // till it is printed on the console
            stream.print(str);
  
            // Now clear the stream
            // using flush() method
            stream.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

GeeksForGeeks

Program 2:




// Java program to demonstrate
// PrintStream flush() method
  
import java.io.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            // Create a PrintStream instance
            PrintStream stream
                = new PrintStream(System.out);
  
            // Write the char to this stream
            // This will put the char in the stream
            // till it is printed on the console
            stream.write(65);
  
            // Now clear the stream
            // using flush() method
            stream.flush();
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

A


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