HashMap同时遍历key与value

遍历整体Object 使用entrySet 
for(Iterator iter = hp.entrySet().iterator();iter.hasNext();){ 
    Map.Entry element = (Map.Entry)iter.next(); 
    Object strKey = element.getKey(); 
    Object strObj = element.getValue(); 
    } 

遍历key  使用keySet 
for(Iterator iter = hp.keySet().iterator();iter.hasNext();){ 
                        iter 
    Object key = iterator.next(); 
    } 
遍历value 使用values() 
for(Iterator iter = hp.values().iterator();iter.hasNext();){ 
                        iter 
    Object key = iterator.next(); 
    } 

附加： 
对文件夹中每个文件进行遍历 
File file = new File("src/form/");  // 根目录 
String[] filelist = file.list();    // 目录下的文件列表 
  for (int i = 0; i < filelist.length; i++) { 
        File fPatter = new File("src/form/" + filelist[i]); 
        InputStreamReader readPatter = new InputStreamReader (new FileInputStream(fPatter),"UTF-8"); 
  }