public static void main(String[] args) {
php
Map<String, String> map = new HashMap<String, String>();
java
map.put("1", "value1");
ide
map.put("2", "value2");
post
map.put("3", "value3");
spa
//第一种：广泛使用，二次取值
blog
System.out.println("经过Map.keySet遍历key和value：");
ci
for (String key : map.keySet()) {
postmessage
System.out.println("key= "+ key + " and value= " + map.get(key));
get
}
it
//第二种
System.out.println("经过Map.entrySet使用iterator遍历key和value：");
Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry<String, String> entry = it.next();
System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
//第三种：推荐，尤为是容量大时
System.out.println("经过Map.entrySet遍历key和value");
for (Map.Entry<String, String> entry : map.entrySet()) {
System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
//第四种
System.out.println("经过Map.values()遍历全部的value，但不能遍历key");
for (String v : map.values()) {
System.out.println("value= " + v);
}
}