自定义类型赋值，自定义数组使用-蒲公英云

自定义类型赋值，自定义数组使用

青旅半醒 2024-03-27 16:48 149阅读 0赞

自定义类型赋值就是创建对象，将地址值赋值给变量

例如，自定义一个Employee，有一个变量 Employee employee，要给employee赋值就

new Employee（）；

部门类

员工类

部门类里面有员工

public class Department {
    private String name;
    private int age;
    private Employee employee;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Employee getEmployee() {
        return employee;
    }
    public void setEmployee(Employee employee) {
        this.employee = employee;
    }
    public Department() {
        // 第2个执行
        System.out.println("这里是部门");
    }
}
class Employee{
    private String name;
    private int age;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Employee(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public Employee(){
        // 第1个执行
        System.out.println("我是员工");
    }
}
class TestDE{
    public static void main(String[] args) {
        Employee employee = new Employee();
        employee.setAge(21);
        employee.setName("欣欣");
        Department department = new Department();
        department.setAge(22);
        department.setName("西西");
//        给部门员工赋值
        department.setEmployee(employee);
        String name = department.getName();
        int age = department.getAge();
        Employee employee1 = department.getEmployee();
//       输出employee1是地址值
        System.out.println(name + "  " + age + "  " + employee1);
//      可以通过对象再获得对象内部的属性
        System.out.println(name + "  " + age + "  " + employee1.getName() + "  " + employee1.getAge());
    }
}

老师类

学生类

老师带了很多学生

把学生存倒数组中 Student[] stus = new Student[n]; // 数组长度为n

public class Teacher {
    private String name;
    private int age;
//    方法一
    private Student[] stu;
//    方法二
    Student[] stu1 = new Student[3];
    public Teacher() {
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Student[] getStu() {
        return stu;
    }
    public void setStu(Student[] stu) {
        this.stu = stu;
    }
}
class Student {
    private String name;
    private int age;
    public Student() {
    }
    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}
class TestTS{
    public static void main(String[] args) {
        Teacher teacher = new Teacher();
        teacher.setAge(26);
        teacher.setName("阿西吧");
//      方法一
        Student[] students = new Student[2];
        students[0] = new Student("小瓜",21);
        students[1] = new Student("小咪",19);
        teacher.setStu(students);
        System.out.println(teacher.getName() + "  " + teacher.getAge() + "  " + teacher.getStu());
        Student[] stu1 = teacher.getStu();
        for (int i = 0; i < stu1.length; i++) {
            System.out.println(stu1[i]);  //  得到学生的地址
            System.out.println(stu1[i].getAge() + "  " + stu1[i].getName());  //  得到学生的属性值
        }
//        方法二
        System.out.println("=================");
        teacher.stu1[0] = new Student("阿鸡", 14);
        System.out.println(teacher.stu1[0].getName());
        System.out.println(teacher.stu1[0].getAge());
    }
}