The PrintWriter class offers the functionality to write to files.

The constructor of the PrintWriter class receives as its parameter a string that represents the location of the target file.

PrintWriter writer = new PrintWriter("file.txt");
writer.println("Hello file!"); //writes the string "Hello file!" and line change to the file
writer.println("More text");
writer.print("And a little extra"); // writes the string "And a little extra" to the file without a line change
writer.close(); //closes the file and ensures that the written text is saved to the file

The constructor of the PrintWriter class might throw an exception that must be either handled or thrown so that it is the responsibility of the calling method.

If the file already exists, the earlier contents are erased when we store the new text.

It is also possible to handle files in a way that adds the new text after the existing content. In that case, you might want to use the FileWriter class.