准备两个实体类:Student类 和 Teacher类
//1.Student实体类
public class Student {
private int sid;
private String sname;
private int age;
//创建教师属性
private Teacher teacher;
public Student() {
}
public Student(int sid, String sname, int age) {
this.sid = sid;
this.sname = sname;
this.age = age;
}
public Student(int sid, String sname) {
this.sid = sid;
this.sname = sname;
}
public Student(int sid, int age) {
this.sid = sid;
this.age = age;
}
(所有属性的getter和setter器)
(重写toString方法)
(重写equals和hashCode方法)
}
//2.Teacher实体类
public class Teacher {
private int tid;
private String tname;
public Teacher() {
}
public Teacher(int tid, String tname) {
this.tid = tid;
this.tname = tname;
}
public Teacher(String tname) {
this.tname = tname;
}
(所有属性的getter和setter器)
(重写toString方法)
(重写equals和hashCode方法)
}
注意:Teacher类作为Student的一个属性存在于Student类中,是引用数据类型;
Student类的其他属性是基本数据类型
总结:
当给基本属性赋值的时候IOC就可以,但是要给引用数据类型赋值就必须借助DI依赖注入了;
IOC是容器,DI是注入这一行为,DI是IOC的具体功能的实现,而IOC则是DI发挥的平台和空间。