好心人帮我用java写下文件的操作可以不？

public class FileReaderExample
{
public static void main( String[] args ) {
try {
Reader r = new FileReader("c:/jet.txt");
int c;
while( ( c = r.read() ) != -1 ) {
System.out.print( ( char )c );
}
r.close();

}
catch( Exception e ) {
e.printStackTrace();
}
}
}

public class FileReaderWriterExample
{
public static void main( String[] args ) {
try {
Reader r = new FileReader( "c:/jet.txt" );
Writer w = new FileWriter( "c:/out.txt" );
int c;
while( ( c = r.read() ) != -1 ) {
System.out.print( ( char )c );
w.write( c );
}
r.close();
w.close();
}
catch( Exception e ) {