How to Append Data to a File Using Java's FileWriter?

Java FileWriter with Append Mode

Problem:

When using Java's FileWriter to write to a file, is there a way to continuously append new data without deleting the existing contents?

Solution:

Yes, you can use the "append" mode in FileWriter to write new data without overwriting previous contents. To enable this mode, pass true as the second argument to the FileWriter constructor:

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

Here's an updated example:

fout = new FileWriter(
    "Distribution_" + Double.toString(_lowerBound) + "_" + Double.toString(_highBound) + ".txt", true);
fileout = new PrintWriter(fout,true);
fileout.print(now.getTime().toString() + ", " + weight + ","+ count +"\n");
fileout.close();

By passing true to the FileWriter constructor, you specify that you want to append to the existing file instead of overwriting it.

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