set转string[] Set<String>set=newHashSet<String>();set.add("data");String[]string=set.toArray(newString[set.size()]); string[]转set(其实是set和list的转换) String[]string=newString[]{"data"};Set<String>set = new HashSet<String>(Arrays.asList(string));...
Set<String>set=newHashSet<>();set.add("A");set.add("B");set.add("C");Map<Integer,String>map=newHashMap<>();intindex=0;for(Stringstr:set){map.put(index++,str);} Set转JSON Set<String>set=newHashSet<>();set.add("A");set.add("B");set.add("C");Stringjson=newGson()....
Int> = hashMapOf()//orvalmap=hashMapOf<String,Int>()//mutableMapOf对应LinkedHashMapmap["a"]=1map["b"]=2map["c"]=3//转为不可变集合valkeySet1:Set<String>=HashSet<String>(map.keys)//orvalkeySet2=setOf(map.keys)//转为可变集合valkeyMutableSet=HashSet(map....
暴力的直接Map对象toString()存,后面取出是就是用再转换为Map String转Map: JSONObject jsonobject = JSONObject.fromObject(str);...rMap = (MapString, Object>) jsonobject; 但很多时候并不能直接将Map对象...
1.3list中对象字段转一个set集合 publicstaticSet<String> getStudentNameSet(List<Student>list ){ Set<String> result = list.stream().map(student->student.getName()).collect(Collectors.toSet());for(String name : result) { System.out.println("name:"+name); ...
String[] arr = {"1", "2"}; List list = Arrays.asList(arr); 4.数组转为set int[] a = { 1, 2, 3 }; Set set = new HashSet(Arrays.asList(a)); 5.map的相关操作。 Map map = new HashMap(); map.put("1", "a"); ...
4 Map的Value值转换为ListMap<Integer,String> map = new HashMap<>();map.put(1,"AAAA");map.put(2,"BBBB");map.put(3,"CCCC");map.put(4,"DDDD");List<String> list = new ArrayList<String>(map.values());5 Array转换为SetString [] countries = {"AAAA", "BBBB", "CCCC", "DDDD"}...
1 将一个实体类的list集合转为map学生实体类：package test;public class Student {private Long id; private String age; public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getAge() { return age; } public void setAge(...
Java List转map java list转map<string,list>,//实体类publicclassStudent{privateStringno;//学号privateStringname;//姓名//构造方法忽略//set、get方法忽略}publicclassTeacher{privateStringno;//教师号privateStringnam
Set<String> set2 = new TreeSet<>(list); // 使用 TreeSet 转换 1. 2. 3. 4. 5. 6. 7. 🎉 Set 转 List Set 转 List 可以使用ArrayList或LinkedList来实现。 Set<String> set = new HashSet<>(); set.add("Alice"); set.add("Bob"); ...