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１．About FileWriter classThis time I will talk about file output. There is a class calledFileWriter in the java.io package, so let's first see how touse this class.----------------------- WriteTest.java -------------------------------------import java.io.*;public class WriteTest {    public static void main(String[] args) throws Exception {        FileWriter fw = null;        try {            File file = new File("c:¥¥test¥¥test.txt");            fw = new FileWriter(file);            fw.write("Hello world");        } catch(FileNotFoundException e) {            System.out.println(e);        } catch (IOException e) {            System.out.println(e);        } finally {             // Close the