How do I append data to a file in Java using FileWriter without overwriting existing content?

Appending to Files Using Java FileWriter

When working with files in Java, it is often necessary to write data to the same file multiple times. By default, using the FileWriter class will overwrite the contents of the file each time it is used. However, there is a way to configure FileWriter to append data to the end of the file without deleting the existing contents.

To enable append mode in FileWriter, simply pass true as the second argument to the constructor:

FileWriter fout = new FileWriter("filename.txt", true);

This will create a new FileWriter instance that is configured to append data to the end of the specified file. You can then use the write() or print() methods to write data to the file:

fout.write("This text will be appended to the end of the file.");
fout.print(12345); // Writes the integer 12345

Once you have finished writing data to the file, be sure to close the FileWriter object to flush the data to the file:

fout.close();

Using append mode with FileWriter is a convenient way to add data to a file without overwriting its existing contents. It is particularly useful for creating log files or maintaining persistent data that needs to be updated frequently.

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