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    map

    package l6.e5.map;
    
    import java.util.HashMap;
    import java.util.Iterator;
    import java.util.Map;
    import java.util.Set;
    
    public class MapTest5My2
    {
    	public static void main(String[] args)
    	{
    		HashMap<String,String> map = new HashMap<String,String>();
    		
    		map.put("a", "aa");
    		map.put("b", "bb");
    		map.put("c", "cc");
    		map.put("d", "dd");
    		
    		Set<String> set = map.keySet();
    		//keyset 1 
    		for (String key : set) {
    			System.out.println("key= "+ key + " and value= " + map.get(key));
    		}
    		//keyset 2
    		Iterator<String> it=set.iterator();
    		while (it.hasNext()) {
    			String key = (String) it.next();
    			String value=map.get(key);
    			System.out.println(key+":"+value);
    			
    		}
    		
    		//entryset
    		Set<Map.Entry<String, String>> set2= map.entrySet();
    		
    		for (Map.Entry<String, String> entry : set2) {
    			System.out.println("key :" + entry.getKey() + " and value :" + entry.getValue());
    		}
    		
    		
    		
    	}
    }
    

      

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  • 原文地址:https://www.cnblogs.com/stit/p/4208089.html
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