JAVA 遍歷 map

1.利用keyset進行遍歷，根據key值獲取value:

public static void workByKeySet(Map<String, String> map) {        
	Set<String> key = map.keySet();        
	for (Iterator it = key.iterator(); it.hasNext();) {
        	String s = (String) it.next();            
		System.out.println(map.get(s));        
	}    
}

2.同時得到key和value:

public static void workByEntry(Map<String, String> map) {
	Set<Map.Entry<String, Student>> set = map.entrySet();
        for (Iterator<Map.Entry<String, String>> it = set.iterator(); it.hasNext();) {
        	Map.Entry<String, String> entry = (Map.Entry<String, String>) it.next();
            	System.out.println(entry.getKey() + "--->" + entry.getValue());      
	}    
}