一个包含Person对象的List，Person里有id, name, classname如何转换为包含String的list

可以使用Java 8的Stream API来实现这个转换：

List<Person> personList = ... // 假设这里是一个包含Person对象的List

List<String> nameList = personList.stream()
        .map(p -> p.getName()) // 提取每个Person对象的name属性
        .collect(Collectors.toList()); // 将所有name属性收集到一个List中

上述代码中，`map`方法将每个Person对象转换成其对应的name属性，最终使用`collect`方法将所有name属性收集到一个List中。

相关问题

1. 设计Person类， （1）包含姓名(String)、性别(String)和年龄(int)成员变量，以及相应的getter和setter方法。 (2) 至少实现一个构造方法 （3）重写toString方法，输出Person对象信息； 2. 以Person为父类，设计一个学生类Student， （1）增加学号(int)、班级(String)、英语成绩、数学成绩和java成绩 这几个成员变量，以相应的getter和setter方法。 (2) 至少实现一个构造方法 (3) 重写toString()方法，输出Student对象信息。 3. 设计一个测试类StudentDemo，包含成员变量List<Student> students; 在main()方法中，调用并实现： （1）添加学生方法addStudents，实现从键盘输入学生信息，创建学生对象，添加到students 。 （2）删除学生方法delStudents，根据从键盘输入的学号信息，从students 删除该学生对象。 （3）输入成绩方法inputScore，从键盘为不同学生输入英语、数学和java成绩。 （4）输出成绩方法outScore， 输出students中所有学生的基本信息、3门课程成绩和平均成绩

1. Person类设计如下：

public class Person {
private String name;
private String gender;
private int age;

public Person() {

}

public Person(String name, String gender, int age) {
this.name = name;
this.gender = gender;
this.age = age;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getGender() {
return gender;
}

public void setGender(String gender) {
this.gender = gender;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

@Override
public String toString() {
return "Name: " + name + ", Gender: " + gender + ", Age: " + age;
}

}

2. Student类设计如下：

public class Student extends Person {
private int id;
private String className;
private double englishScore;
private double mathScore;
private double javaScore;

public Student() {

}

public Student(int id, String className, double englishScore, double mathScore, double javaScore, String name, String gender, int age) {
super(name, gender, age);
this.id = id;
this.className = className;
this.englishScore = englishScore;
this.mathScore = mathScore;
this.javaScore = javaScore;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getClassName() {
return className;
}

public void setClassName(String className) {
this.className = className;
}

public double getEnglishScore() {
return englishScore;
}

public void setEnglishScore(double englishScore) {
this.englishScore = englishScore;
}

public double getMathScore() {
return mathScore;
}

public void setMathScore(double mathScore) {
this.mathScore = mathScore;
}

public double getJavaScore() {
return javaScore;
}

public void setJavaScore(double javaScore) {
this.javaScore = javaScore;
}

@Override
public String toString() {
return super.toString() + ", Id: " + id + ", Class Name: " + className;
}

}

3. StudentDemo测试类设计如下：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Scanner;

public class StudentDemo {
private List<Student> students = new ArrayList<>();

public void addStudents() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter Student Name: ");
String name = scanner.next();
System.out.print("Enter Student Gender: ");
String gender = scanner.next();
System.out.print("Enter Student Age: ");
int age = scanner.nextInt();
System.out.print("Enter Student Id: ");
int id = scanner.nextInt();
System.out.print("Enter Student Class Name: ");
String className = scanner.next();
Student student = new Student(id, className, 0, 0, 0, name, gender, age);
students.add(student);
}

public void delStudents() {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter Student Id to Delete: ");
int id = scanner.nextInt();
Iterator<Student> iterator = students.iterator();
while(iterator.hasNext()) {
Student student = iterator.next();
if(student.getId() == id) {
iterator.remove();
}
}
}

public void inputScore() {
Scanner scanner = new Scanner(System.in);
for(Student student: students) {
System.out.println("Enter Scores for Student " + student.getName());
System.out.print("Enter English Score: ");
double englishScore = scanner.nextDouble();
student.setEnglishScore(englishScore);
System.out.print("Enter Math Score: ");
double mathScore = scanner.nextDouble();
student.setMathScore(mathScore);
System.out.print("Enter Java Score: ");
double javaScore = scanner.nextDouble();
student.setJavaScore(javaScore);
}
}

public void outScore() {
for(Student student: students) {
double average = (student.getEnglishScore() + student.getMathScore() + student.getJavaScore()) / 3;
System.out.println(student.toString() + ", English Score: " + student.getEnglishScore() + ", Math Score: " + student.getMathScore() + ", Java Score: " + student.getJavaScore() + ", Average Score: " + average);
}
}

public static void main(String[] args) {
StudentDemo demo = new StudentDemo();

// Add Students
demo.addStudents();
demo.addStudents();
demo.addStudents();

// Delete Student
demo.delStudents();

// Input Scores
demo.inputScore();

// Output Scores
demo.outScore();
}

}

注意：本代码仅为参考，请根据个人需要进行修改优化。

Java编写设计一个简单的学校人事管理系统,管理教师和学生信息。实现教师与学生基本信息的添加、删除、修改、查询。其中编号、姓名、性别、出生日期为共有的，教师包括部门、职称、工资；学生包括高考分数、专业field、班级等。

好的，以下是一个简单的Java代码实现，使用了面向对象的思想。

首先，定义一个Person类，包含编号、姓名、性别、出生日期等基本属性：

public class Person {
    private int id;
    private String name;
    private String gender;
    private Date birthDate;

    public Person(int id, String name, String gender, Date birthDate) {
        this.id = id;
        this.name = name;
        this.gender = gender;
        this.birthDate = birthDate;
    }

    // 省略Getter和Setter方法
}

然后，定义一个Teacher类，继承自Person类，增加部门、职称、工资等属性：

public class Teacher extends Person {
    private String department;
    private String title;
    private double salary;

    public Teacher(int id, String name, String gender, Date birthDate, String department, String title, double salary) {
        super(id, name, gender, birthDate);
        this.department = department;
        this.title = title;
        this.salary = salary;
    }

    // 省略Getter和Setter方法
}

接下来，定义一个Student类，同样继承自Person类，增加高考分数、专业field、班级等属性：

public class Student extends Person {
    private int entranceScore;
    private String major;
    private String className;

    public Student(int id, String name, String gender, Date birthDate, int entranceScore, String major, String className) {
        super(id, name, gender, birthDate);
        this.entranceScore = entranceScore;
        this.major = major;
        this.className = className;
    }

    // 省略Getter和Setter方法
}

最后，定义一个School类，包含一个教师列表和一个学生列表，实现教师与学生基本信息的添加、删除、修改、查询等功能：

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class School {
    private List<Teacher> teachers;
    private List<Student> students;

    public School() {
        this.teachers = new ArrayList<>();
        this.students = new ArrayList<>();
    }

    public void addTeacher(int id, String name, String gender, Date birthDate, String department, String title, double salary) {
        Teacher teacher = new Teacher(id, name, gender, birthDate, department, title, salary);
        teachers.add(teacher);
    }

    public void deleteTeacher(int id) {
        for (int i = 0; i < teachers.size(); i++) {
            if (teachers.get(i).getId() == id) {
                teachers.remove(i);
                break;
            }
        }
    }

    public void updateTeacher(int id, String department, String title, double salary) {
        for (Teacher teacher : teachers) {
            if (teacher.getId() == id) {
                teacher.setDepartment(department);
                teacher.setTitle(title);
                teacher.setSalary(salary);
                break;
            }
        }
    }

    public List<Teacher> queryTeacher(String name) {
        List<Teacher> result = new ArrayList<>();
        for (Teacher teacher : teachers) {
            if (teacher.getName().equals(name)) {
                result.add(teacher);
            }
        }
        return result;
    }

    public void addStudent(int id, String name, String gender, Date birthDate, int entranceScore, String major, String className) {
        Student student = new Student(id, name, gender, birthDate, entranceScore, major, className);
        students.add(student);
    }

    public void deleteStudent(int id) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getId() == id) {
                students.remove(i);
                break;
            }
        }
    }

    public void updateStudent(int id, String major, String className) {
        for (Student student : students) {
            if (student.getId() == id) {
                student.setMajor(major);
                student.setClassName(className);
                break;
            }
        }
    }

    public List<Student> queryStudent(String name) {
        List<Student> result = new ArrayList<>();
        for (Student student : students) {
            if (student.getName().equals(name)) {
                result.add(student);
            }
        }
        return result;
    }
}

以上就是一个简单的学校人事管理系统的Java实现。可以根据实际需求进行修改和扩展。