第四周JAVA作业

本次作业实现实现了大文件快速拷贝

package copy;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyFile {
/**
* @param args
/
public static void main(String[] args) {
long startTime = System.currentTimeMillis();
try {
FileInputStream fis = new FileInputStream ("a.mp3");
FileOutputStream fos = new FileOutputStream ("temp.mp3");
int read = fis.read();
byte[] b = new byte[10241000];
int len = 0 ;
while((len=fis.read(b)) != -1){
fos.write(b,0,len);
}
fis.close();
fos.close();
} catch (IOException e) {
e.printStackTrace();
}

long endTime = System.currentTimeMillis();
System.out.println("复制时间："+(endTime-startTime)+"ms");

}
}