java第四次作业

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
public class CopyFile {
public static void main(String[] args) {
// TODO Auto-generated method stub
CopyMp3 cy = new CopyMp3();
cy.copy();
}

}
class CopyMp3{
public CopyMp3(){}
void  copy(){
long starttime = System.currentTimeMillis();
try {
FileInputStream fis = new FileInputStream("src/a.mp3");
FileOutputStream fos = new FileOutputStream("src/temp.mp3");
byte[] b = new byte[2048];
int read = fis.read(b);
while(read!=-1){
fos.write(b);
read = fis.read(b);
}
fis.close();
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
long endtime = System.currentTimeMillis();
System.out.println("用时:"+(endtime-starttime)+"ms");

}
}