利用Stream流List＜实体类＞转List＜String＞或List＜String＞转List＜String＞

package Tool;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Objects;
import java.util.Set;
import java.util.stream.Collectors;
import AnZhong.Student;
public class convertMap {
  public static void main(String[] args) {
    List<Student> listStudent = new ArrayList<>();
    List<String> numberList = Arrays.asList("一","二","三","四","五");
    Student student = new Student();
    student.setAge("11");
    student.setName("万能C");
    student.setId(1);
    listStudent.add(student);
    Student student2 = new Student();
    student2.setAge("11");
    student2.setName("admin");
    student2.setId(2);
    listStudent.add(student2);
    Student student3 = new Student();
    student3.setAge("13");
    student3.setName("Jack");
    student3.setId(3);
    listStudent.add(student3);
    Student student4 = new Student();
    student4.setAge("16");
    student4.setName("Jack");
    student4.setId(3);
    listStudent.add(student4);
      /***
     * -- .distinct()是去重
     * -- .map()里面写的是需要取出来的字段
     * -- .filter()里面是过滤条件,true或者false
     * -- .collect(Collectors.toList()),这个query是一个Java代码片段，
     * 使用了Java 8中的Stream API和Collectors.toList()方法。
     * 该方法用来将Stream中的元素收集到一个List中
     * ***/
    List<String> list2 = listStudent.stream().map(s -> s.getName()).distinct().collect(Collectors.toList());
    //.添加过滤,取年龄不等于13的名字
    List<String> list3 = listStudent.stream().filter(f -> !f.getAge().equals("13")).map(s -> s.getName()).collect(Collectors.toList());
    //在已有的List修改里面的值，转成一个新的List<String>
    List<String> list4 = numberList.stream().map(number -> "数字 " + number + "L").collect(Collectors.toList());
    System.out.println("list2(去重)  "+list2);
    System.out.println("list3(添加过滤条件):  "+list3);
    System.out.println("list4(修改里面内容):  "+list4);
  }
}