java第四次作业

package fuzhi;

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 void CopyMp3(){}
void  copy(){
long startTime = System.currentTimeMillis();//获取当前时间
try {
FileInputStream fis = new FileInputStream ("src/a.mp3");
FileOutputStream fos = new FileOutputStream ("src/temp.mp3");
//int read = fis.read();
byte[] bt = new byte[4096];
int n = 0;
while ( -1!=(n=fis.read(bt)) ) {
//                fos.write(read);
//                read = fis.read();
fos.write(bt, 0, n);
}
fis.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}

long endTime = System.currentTimeMillis();
System.out.println("程序运行时间： "+(endTime-startTime)+"ms");
}
}