import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author oweson
 * @date 2022年6月13日 21:58
 */


public class LambdaTest {
 public static void main(String[] args) {
 /* Map<Integer,UserBean> map = new HashMap<>();
 UserBean userBean = new UserBean();
 userBean.setId(0);
 userBean.setName("one");
 UserBean userBeanSecond = new UserBean();
 userBean.setId(0);
 userBean.setName("second");
 map.put(1,userBean);
 map.put(2,userBeanSecond);

 for (Map.Entry<Integer, UserBean> item : map.entrySet()) {
 UserBean value = item.getValue();


 }*/
 List<UserBean> userBeanList = new ArrayList<>();
 UserBean userBean = new UserBean();
 userBean.setId(1);
 userBean.setName("one");
 UserBean userBeanSecond = new UserBean();
 userBeanSecond.setId(2);
 userBeanSecond.setName("second");
 UserBean userBeanThree = new UserBean();
 userBeanThree.setId(2);
 userBeanThree.setName("three");
 userBeanList.add(userBean);
 userBeanList.add(userBeanSecond);
 userBeanList.add(userBeanThree);
 Map<Integer, List<UserBean>> userMaps = userBeanList.stream().collect(Collectors.groupingBy(UserBean::getId));
 for (Map.Entry<Integer, List<UserBean>> item : userMaps.entrySet()) {
 List<UserBean> value = item.getValue();
 List<UserBean> collect = value.stream().filter(x -> x.getId() == 1).collect(Collectors.toList());
 for (UserBean bean : collect) {
 bean.setName("change");
 }
 }
 for (UserBean bean : userBeanList) {
 System.out.println(bean);
 }


 }
}