不使用框架依賴注入控制反轉的java創建對象的流程

package hello.io;

import java.util.ArrayList;

public class Psvm {
    public static void main(String[] args) {
        Teacher teacher = new Teacher();
        System.out.println(teacher.listStu);
        Student student = new Student(1,"hh");
        Student student2 = new Student(2,"dd");
        System.out.println(teacher);
        teacher.listStu = new ArrayList<>();
        teacher.listStu.add(student);
        teacher.listStu.add(student2);
        System.out.println(teacher.listStu.get(1));

    }
}

package hello.io;

import java.util.List;

public class Teacher {a
    int id;
    String name;
    List<Student> listStu;

    public int getId() {
        return id;
    }

    public Teacher() {
        System.out.println("老師構造");
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        System.out.println("老師set");
    }

    public List<Student> getListStu() {
        return listStu;
    }

    public void setListStu(List<Student> listStu) {
        this.listStu = listStu;
    }

    @Override
    public String toString() {
        return "Teacher{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", listStu=" + listStu +
                '}';
    }
}

package hello.io;

public class Student {
    int StuId;
    String name;

    public int getStuId() {
        return StuId;
    }

    public void setStuId(int stuId) {
        StuId = stuId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
        System.out.println("學生set");
    }

    public Student(int stuId, String name) {
        StuId = stuId;
        this.name = name;
    }

    public Student() {
        System.out.println("學生構造");
    }

    @Override
    public String toString() {
        return "Student{" +
                "StuId=" + StuId +
                ", name='" + name + '\'' +
                '}';
    }
}