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🔔 Subscribe to Ram N JavaUnderstanding Java BufferedWriter and Custom Buffer Sizing
When writing character streams in Java, interacting directly with the file system on every write operation is computationally expensive. Each disk operation takes valuable CPU cycles and slows down your application.
The BufferedWriter class in Java IO solves this by creating an internal buffer in memory. Instead of writing character by character directly to the disk, characters are held in memory until the buffer is full (or flushed) and then written to the underlying stream in one fast, efficient batch.
The BufferedWriter(Writer out, int sz) Constructor Explained
Java's BufferedWriter provides an overloaded constructor that allows you to specify both the destination writer and your custom buffer size:
-
Writer out: The target character stream (such as a
FileWriter) where data will ultimately be written. - int sz: The custom buffer size (in characters). If not provided, Java defaults to an internal 8192-character buffer.
- Optimized Throughput: Setting a custom buffer size is especially beneficial when handling large logs, data exports, or high-throughput batch write systems.
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