How to traverse a folder in java

Traverse folders

  public void printFiles(File dir,int tab) {//tab为不同目录结构的缩进量
    if (dir.isDirectory()) {
      File next[] = dir.listFiles();//判断如果是目录 则返回目录所有的文件名数组用于遍历文件夹
      for (int i = 0;i<next.length;i++) {//层次缩进输出
        System.out.print("---");
      }
      for(int i = 0;i<next.length;i++) {//这里用了递归获取目录结构
        System.out.println(next[i].getName());
        if (next[i].isFile()) {
          printFiles(next[i],++tab);

        }
      }
    }
  }

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