第四周笔记——复制文件（可读时间）

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFile {

/**
* @param args
*/
public static void copy(File a,File b){
try {
FileInputStream fis = new FileInputStream("a.mp3");
FileOutputStream fos = new FileOutputStream("temp.mp3");
//改进方法代码
byte[] buf = new byte[1444];
int length;
int read = fis.read();
while((length = fis.read(buf))!=-1){
fos.write(buf, 0, length);
//
}
fis.close();
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
//测试时间代码
File a = new File("");
File b = new File("");
long start,end;
start = System.currentTimeMillis();
copy(a,b);
end = System.currentTimeMillis();
System.out.println("用时：" + (end - start) + "ms");
//
}

}