->有这样一个Map集合
Map<String, String> map = new HashMap<String, String>(); map.put("1", "value1"); map.put("2", "value2"); map.put("3", "value3");
->第一种方法:通过Map.keySet遍历key和value
for (String key : map.keySet()) { System.out.println("key= "+ key + " and value= " + map.get(key)); }
->第二种方法:通过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()); }
->第三种方法: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= " + entry.getValue()); }
->第四种方法: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= " + v); }