Java FileWriter inherits several methods from its superclass, OutputStreamWriter, as well as some methods of its own. Here are some of the methods available in the FileWriter class:

1. write(int c): This method writes a single character to the output stream.

2. write(char[] cbuf): This method writes an array of characters to the output stream.

3. write(String str): This method writes a string to the output stream.

4. write(char[] cbuf, int off, int len): This method writes a portion of an array of characters to the output stream, starting at the specified off offset and writing up to len characters.

5. write(String str, int off, int len): This method writes a portion of a string to the output stream, starting at the specified off offset and writing up to len characters.

6. flush(): This method flushes the output stream, forcing any buffered output to be written to the file.

7. close(): This method closes the output stream and releases any system resources associated with it.

Note that like all output stream classes, FileWriter is designed to write characters to a stream one at a time. If you need to write a large amount of data at once, you may want to consider using a buffer or a higher-level class such as BufferedWriter.