java 简单的拷贝文件夹

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import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException;   class Wenjian implements Runnable{     static String str="C:\\Users\\cdlx2016\\Desktop\\实验";     static String str10="C:\\Users\\cdlx2016\\Desktop\\实验2";       static int a=0;      //static File file = new File(str);       @Override     public void run() {           synchronized ("222") {                               paly(str10);           }     }       public void paly(String str11){                 File file1 = new File(str11);           File file = new File(str);           //创建新的文件夹           file1.mkdirs();             File[] files = file.listFiles();             for (int i = 0;i<files.length;i++) {                 //System.out.println(files[i].getName());                 if(files[i].isFile()){                     //拼接新的文件地址                     String s = str11+"\\"+files[i].getName();                     //原来的文件地址                     String s1 = files[i].getPath();                         ShuRu(s1,s);                 }                 if (files[i].isDirectory()) {                                           str=files[i].getPath();                     //拼接新的文件夹地址                     str10=str11+"\\"+files[i].getName();                                           paly(str10);             }        }                   }       public static void ShuRu(String str4,String s) {             File file =new File(str4);                                   FileInputStream iputFileInputStream=null;                 try {                     iputFileInputStream = new FileInputStream(file);                     byte[] b = new byte[1024];                     int cuont=0;                     try {                         while ((cuont=iputFileInputStream.read(b))!=-1) {                             System.out.println(new String(b, 0, cuont));                             ShuChu(b,s);                            }                     } catch (IOException e) {                          System.out.println("你的硬盘有问题");                          throw new RuntimeException(e);                     }                 } catch (FileNotFoundException e) {                      System.out.println("你写入的文件有误");                        throw new RuntimeException(e);                 }finally{                                           try {                         iputFileInputStream.close();                     } catch (IOException e) {                          System.out.println("无法关闭");                          throw new RuntimeException(e);                     }                                       }                               }       public static void ShuChu(byte[] bb ,String s){         //C:\Users\cdlx2016\Desktop           a++;         File file =new File(s);         FileOutputStream outputStream = null;         try {             outputStream = new FileOutputStream(file,true);             byte [] b = bb;             try {                 outputStream.write(b);             } catch (IOException e) {                  System.out.println("你的硬盘有问题");                  throw new RuntimeException(e);             }         } catch (FileNotFoundException e) {                System.out.println("你写出的文件有误");                throw new RuntimeException(e);         }finally{             try {                 outputStream.close();             } catch (IOException e) {                  System.out.println("无法关闭");                  throw new RuntimeException(e);                                }         }                         } }       public class Work1 {       public static void main(String[] args) {         // TODO Auto-generated method stub       //（七）输入两个文件夹名称，将A文件夹内容全部拷贝到B文件夹，要求使用多线程来操作。 必做         Wenjian ww=new Wenjian();           Thread t = new Thread(ww,"下载一");           Thread t1 = new Thread(ww,"下载一");           t.start();           t1.start();                                      }   }