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");
    }
}