java中遍歷MAP的幾種方法
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Map<String,String> map=new HashMap<String,String>(); map.put("username", "qq"); map.put("passWord", "123"); map.put("userID", "1"); Map<String,String> map=new HashMap<String,String>(); map.put("username", "qq"); map.put("passWord", "123"); map.put("userID", "1"); |
第一種用for循環
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for(Map.Entry<String, String> entry:map.entrySet()){ System.out.println(entry.getKey()+"--->"+entry.getValue()); } for(Map.Entry<String, String> entry:map.entrySet()){ System.out.println(entry.getKey()+"--->"+entry.getValue()); } |
第二種用迭代
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Set set = map.entrySet(); Iterator i = set.iterator(); while(i.hasNext()){ Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next(); System.out.println(entry1.getKey()+"=="+entry1.getValue()); } Set set = map.entrySet(); Iterator i = set.iterator(); while(i.hasNext()){ Map.Entry<String, String> entry1=(Map.Entry<String, String>)i.next(); System.out.println(entry1.getKey()+"=="+entry1.getValue()); } |
用keySet()迭代
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Iterator it=map.keySet().iterator(); while(it.hasNext()){ String key; String value; key=it.next().toString(); value=map.get(key); System.out.println(key+"--"+value); } Iterator it=map.keySet().iterator(); while(it.hasNext()){ String key; String value; key=it.next().toString(); value=map.get(key); System.out.println(key+"--"+value); } |
用entrySet()迭代
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Iterator it=map.entrySet().iterator(); System.out.println( map.entrySet().size()); String key; String value; while(it.hasNext()){ Map.Entry entry = (Map.Entry)it.next(); key=entry.getKey().toString(); value=entry.getValue().toString(); System.out.println(key+"===="+value); } |
以上就是對Java 遍歷MAP的資料整理，后續繼續補充相關資料，謝謝大家對本站的支持！
