io流

import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;




public class liu11 {
public static class Test2 {
public static void main(String[] args) throws IOException {
new File("D:/HW.java");
new File("D:/HelloWorld.java");
FileReader fis=new FileReader("D:/HelloWorld.java");
FileWriter fos=new FileWriter("D:/HW.java");
int i;
while((i=fis.read())!=-1){
fos.write(i);
}
fis.close();
fos.close();
FileReader fis1=new FileReader("D:/HW.java");
while((i=fis1.read())!=-1){
System.out.println((char)i);
}
fis1.close();
}
}




}