（集合）Map集合
public static void main(String[] args) {Map<String,Integer> map = new HashMap<String,Integer>();map.put("zs", 23);map.put("ls", 24);map.put("ww", 25);//-------------------使用高级for循环-----------------for(String key : map.keySet()) {System.out.println(key+"---"+map.get(key));}for(Map.Entry<String, Integer> me : map.entrySet()) {String key = me.getKey();Integer value = me.getValue();System.out.println(key+"==="+value);}//---------------基于Iterator迭代-----------------Iterator<String> keys = map.keySet().iterator();while(keys.hasNext()) {String key = keys.next();Integer value = map.get(key);System.out.println(key+"---"+value);}Iterator<Map.Entry<String, Integer>> iter = map.entrySet().iterator();while(iter.hasNext()) {Map.Entry<String, Integer> me = iter.next();String key = me.getKey();Integer value = me.getValue();System.out.println(key+"==="+value);}}
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