map2

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public class TestMap {    public void test2() {        Map<String, String> map = new HashMap<String, String>();        map.put("aa", "11");        map.put("bb", "22");        map.put("cc", "33");        for (Map.Entry<String, String> entry : map.entrySet()) {            System.out.println(entry.getKey() + "--" + entry.getValue());        }        System.out.println("------------");        Set<String> keySet = map.keySet();        Iterator<String> it = keySet.iterator();        while (it.hasNext()) {            String key = it.next();            String value = map.get(key);            System.out.println(key + "==" + value);        }        System.out.println("------------");        Set<Entry<String, String>> entrySet = map.entrySet();        Iterator<Entry<String, String>> iterator = entrySet.iterator();        while(iterator.hasNext()){            Entry<String, String> entry = iterator.next();            System.out.println(entry.getKey()+"-="+entry.getValue());        }    }}

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