Menu
StringWriter has a flush function. What does it mean to flush a string buffer?
907
The flush() method of StringWriter Class in Java is used to flush the writer. By flushing the writer, it means to clear the writer of any element that may be or maybe not inside the writer. It neither accepts any parameter nor returns any value.
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.
StringWriter class is a character stream that collects its output in a string buffer, which can then be used to construct a string. Closing a StringWriter has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.
flush() method flushes the stream. If the stream has saved any characters from the various write() methods in a buffer, write them immediately to their intended destination. Then, if that destination is another character or byte stream, flush it.
It must have an implementation of flush() because in its superclass Writer that's an abstract method, and StringWriter is not an abstract class. However, if you look at the source code of StringWriter.flush(), which you can find in the file src.zip in your JDK installation directory, you'll see:
/**
* Flush the stream.
*/
public void flush() {
}
In other words, it does nothing. (There are ofcourse other subclasses of Writer where flush() does do something useful).
The person who implemented this method could have documented that it doesn't do anything, but they didn't.
166
In general a flush forces a buffer to write its content to the destination, for example writing the bytes to the file on the harddisk.
34
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
