);//使用Stream API将List转换为MapMap<String, String> map =list.stream() .collect(Collectors.toMap(KeyValuePair::getKey, KeyValuePair::getValue));//打印转换后的Mapmap.forEach((key, value) -> System.out.println(key +"->"+value)); }staticclassKeyValuePair {privateString key;privateStrin...
list.add(newStudent("1003", "小D"));//将list转map 【key为1个属性,value为1个属性】Map<String, String> map =list.stream().collect(Collectors.toMap( Student::getNo, Student::getName, (key1 , key2)-> key1//(map的键重复不会报错,下面已经处理)));//将list转map 【key为多个属性,valu...
List<Map<String,String>> listObjectFir = (List<Map<String,String>>) JSONArray.parse(strArr); System.out.println("利用JSONArray中的parse方法来解析json数组字符串"); for(Map<String,String> mapList : listObjectFir){ for (Map.Entry entry : mapList.entrySet()){ System.out.println( entry.ge...
转换为map,然后值根据排序获取最大的一个 tableMap = list.stream().filter(t->t.getTargetSchemaName().equals(e.getKey())) .collect(Collectors.groupingBy(DgComponentSjjrJtsjDatatable::getTargetTableName, Collectors.collectingAndThen(Collectors.maxBy(Comparator.comparingInt(DgComponentSjjrJtsjDatatable::...
@Testpublicvoidtest02(){List<String>names=Arrays.asList("tom","jack","jerry","tom");Map<String,Integer>collect=names.stream().collect(toMap(Function.identity(),String::length));System.out.println(collect)}/* 因为List包含两个tom,转成Map会有两个同样的Key,这个是不允许的。所以会报错: ...
publicstaticvoidmain(String[]args){List<Student>stu=newArrayList<>();Students1=newStudent();s1.setId(1);s1.setName("zs");Students2=newStudent();s2.setId(1);s2.setName("ls");Students3=newStudent();s3.setId(3);s3.setName("ww");stu.add(s1);stu.add(s2);stu.add(s3);stu.stre...
Map<String, String> collect = listMap.stream().collect( Collectors.toMap( t -> t.get("name"), t -> t.get("code"), (o, n) -> n, HashMap::new ) );
将List<Map<String, Object>>转换为List<Map<String, String>>可以通过遍历原始列表,逐个处理每个Map对象的值,并将其转换为String类型。下面是一个示例代码: 代码语言:txt 复制 import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class...
{\"cpuNumber\":2,\"memorySize\":4,\"serverName\":\"bbb\",\"serversNumber\":1}]";List<Map<String,String>>list=(List<Map<String,String>>)JSONArray.parse(appNames);System.out.println(list);for(Map<String,String>mapList:list){System.out.println(mapList);for(Map.Entry entry:mapList...