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遍历map
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("1", "value1");
map.put("2", "value2");
map.put("3", "value3");
//第一种:普遍使用,二次取值
System.out.println("通过Map.keySet遍历key和value:");
for(String key : map.keySet()){
System.out.println("key="+key+"and value="http://www.mamicode.com/+map.get(key));
}
//第二种
System.out.println("通过Map.entrySet使用iterator遍历key和value:");
Iterator<Map.EntrySet<String, String>> it = map.entrySet().iterator();
while(it.hasNext()){
Map.EntrySet<String, String> entry = it.next();
System.out.println("key="+entry.getKey()+"and value="http://www.mamicode.com/+entry.getValue());
}
//第三种:推荐,尤其是容量大时
System.out.println("通过Map.entrySet遍历key和value");
for(Map.Entry<String, String> entry:map.entrySet()){
System.out.println("key="+entry.getKey+"and value="http://www.mamicode.com/+entry.getValue);
}
//第四种
System.out.println("通过Map.values()遍历所有的value,但不能遍历key");
for(String v : map.values()){
System.out.println("value="http://www.mamicode.com/+v);
}
转:http://www.cnblogs.com/kristain/articles/2033566.html
遍历map