【转】 java循环Map java迭代Map介绍

java

public static void main(String[] args) {

Map<String, String> map = new HashMap<String, String>();

map.put("1", "a");

map.put("222", "aa");

map.put("33", "aaa");

Set<String> set = new HashSet<String>();

set= map.keySet();

for (String key : set) {

//循环取出了你map里面的值然后再调用你的sql方法想怎么存就怎么存

System.out.print(key+" = "+map.get(key));

}

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Map a = new HashMap();

//方法一

Iterator it = a.entrySet().iterator();

while (it.hasNext()) {

Map.Entry pairs = (Map.Entry) it.next();

System.out.println(pairs.getValue());

}

//以下方法需要jdk5以上支持

//方法二

for(String str:akeySet()){

System.out.println(str);

}

//方法三

for(Map.Entry entry:a.entrySet()){

System.out.println(entry.getKey()+"="+entry.getValue());

}