要遍历HashMap的所有value,你可以使用Java的迭代器。以下是一个示例代码: import java.util.HashMap; import java.util.Map; import java.util.Iterator; public class Main { public static void main(String[] args) { HashMap<String, String> hashMap = new HashMap<>(); hashMap.put("key1", "value...
1、遍历entry,从entry中拿key和value map.entrySet().forEach(entry -> { System.out.print(entry.getKey()+":"); System.out.println(entry.getValue()); }); 1. 2. 3. 4. 2、单独遍历key和value map.keySet().forEach(key->{ System.out.println(key); }); map.values().forEach(value->...
publicList<String> getValueList(HashMap<String,String> map){ ArrayList<String> valueList =newArrayList<>(); Collection<String> values = map.values(); for(String value : values){ valueList.add(value); } returnvalueList; }
HashMap<String, Person> map=new HashMap<String,Person>(); map.put("first",new Person("刘翔", 35)); map.put("second",new Person("呆萌", 18)); Person person=map.get("second"); System.out.println(person.getName()); //遍历方法1 //1.先返回 字典对 集合 字典对是由key和value组成...
简介:HashMap遍历所有的key和value 1、遍历entry,从entry中拿key和value map.entrySet().forEach(entry -> {System.out.print(entry.getKey()+":");System.out.println(entry.getValue());}); 2、单独遍历key和value map.keySet().forEach(key->{System.out.println(key);});map.values().forEach(va...