javaMap<String,Object> map =newHashMap<>(); // 添加一些键值对到map中 Iterator<Map.Entry<String,Object>> iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String,Object> entry = iterator.next(); System.out.println("Key: " + entry.getKey() +", Value: "...
Map<String, Object> mapData = new HashMap<>(); 1. 不太理解是什么意思,上网浏览解决完后总结一下。 Map接口 java.util中的集合类包含Java中某些最常用的类。最常用的集合类是List和Map。 Map是一种 键-值对(key-value) Map 接口主要有两个实现类:HashMap 类和 TreeMap 类。其中,HashMap 类按哈希...
publicstaticvoidmain(String[] args) { String a="aaa";intb=10; Map<String,Object> map=newHashMap<String, Object>() ; map.put("a",a); map.put("b", b);//1、keySet()Set<String> set=map.keySet();for(String key:set) { System.out.println(key+":"+map.get(key)); }//2、ent...
AI代码解释 HashMap<String,String>dataMap=newHashMap<>(4);dataMap.put("key1","value1");dataMap.put("key2","value2");dataMap.put("key3","value3");dataMap.put("key4","value4");String byToString=dataMap.toString();String byJSONString=JSON.toJSONString(dataMap);System.out.println...
Map<String,Object> dataMap = new HashMap<String,Object>();dataMap.put("0","1");dataMap.put("1","1");dataMap.put("2","1");dataMap.put("3","3");//...数据
Map<String, Object> map = new HashMap<>(); map.put("id", 123L); map.put("name", "悟空GoKu"); stringRedisTemplate.set("KEY_GOKU", JsonUtil.toJsonString(map)); return ApiResponse.ok(); } //get @PostMapping(value = "/getData") public ApiResponse getData(ApiRequest request) { ...
Map<String,String>data=newHashMap<>();data.put("name","Alice");data.put("age","25"); 1. 2. 3. 我们可以使用Mapper类来将Map中的值映射到Person对象中: Personperson=newPerson();Mapper.map(data,person);System.out.println(person.getName());// 输出AliceSystem.out.println(person.getAge(...
User user=newUser();Map<String,Object>mapRepresentation=Maps.newHashMap();for(Field field:user.getClass().getDeclaredFields()){field.setAccessible(true);mapRepresentation.put(field.getName(),field.get(user));}System.out.println(mapReflection); ...
package com.mryx.datastructure; import org.junit.Test; import java.util.Collection; import java.util.HashMap; import java.util.Map; import java.util.Set; public class HashMapTest { @Test public void testHashMap(){ //右侧带注释斜杠//的都是api HashMap<String,Object> map = new HashMap<...
Map<String, Integer> map = Stream.of(newObject[][] { {"data1",1}, {"data2",2}, }).collect(Collectors.toMap(data -> (String) data[0], data -> (Integer) data[1])); 结果,我们将键的映射创建为String,将值创建为Integer。