Java——Iterate through a HashMap

遍历Map

 

import java.util.*;


public class IterateHashMap {

    public static void main(String[] args) {
        Map<String,Object> map=new  HashMap<String,Object>();
        // If you're only interested in the keys, you can iterate through the keySet() of the map:
        for (String key : map.keySet())
        {
            // ...
        }
        //If you only need the values, use values():
        for (Object value : map.values()) 
        {
            // ...
        }
        //Finally, if you want both the key and value, use entrySet():
        for (Map.Entry<String, Object> entry : map.entrySet()) 
        {
            String key = entry.getKey();
            Object value = entry.getValue();
            // ...
        }
        //
        Iterator it = map.entrySet().iterator();
        while (it.hasNext()) {
            Map.Entry pair = (Map.Entry)it.next();
            System.out.println(pair.getKey() + " = " + pair.getValue());
            it.remove(); // avoids a ConcurrentModificationException
        }

    }
}

来源：http://stackoverflow.com/questions/1066589/iterate-through-a-hashmap