Solution to error reporting when traversing values ​​in Java

This article mainly introduces the relevant information about the solution to the traversal value exception (Hashtable Enumerator) in Java. The exception thrown when using the iterator to obtain the value: java.util.NoSuchElementException: Hashtable Enumerator. Friends in need can refer to it. Next

Solution to the exception error when traversing value in Java

Exception thrown when using iterator to obtain value: java.util.NoSuchElementException: Hashtable Enumerator

Sample code

//使用迭代器遍历 
      Iterator<String> it = tableProper.stringPropertyNames().iterator();       
      sqlMap = new HashMap<String,String>(); 
      while(it.hasNext()){ 
        sqlMap.put(it.next(), tableProper.getProperty(it.next())); 
      }

This is an enumeration exception because it.next() has not yet been executed. Start quoting it. We can solve this problem as follows:

//使用迭代器遍历 
      Iterator<String> it = tableProper.stringPropertyNames().iterator();       
      sqlMap = new HashMap<String,String>(); 
      String key; 
      while(it.hasNext()){ 
        key = it.next(); 
        sqlMap.put(key, tableProper.getProperty(key)); 
      }

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