flush in java.io.FileWriter

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Writers and streams usually buffer some of your output data in memory and try to write it in bigger blocks at a time. flushing will cause an immediate write to disk from the buffer, so if the program crashes that data won’t be lost. Of course there’s no guarantee, as the disk may not physically write the data immediately, so it could still be lost. But then it wouldn’t be the Java program’s fault 🙂

PrintWriters auto-flush (by default) when you write an end-of-line, and of course streams and buffers flush when you close them. Other than that, there’s flushing only when the buffer is full.

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