自定义类型赋值，自定义数组使用

青旅半醒 2024-03-27 16:48 71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（）；

<table style=""> 
 <tbody> 
  <tr> 
   <td style="width:484px;vertical-align:top;height:51px;"><p style="text-align:left;">部门类</p><p style="text-align:left;">员工类</p><p style="text-align:left;">部门类里面有员工</p></td> 
  </tr> 
 </tbody> 
</table>

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());
    
        }
    }

![72d681eb09cba904ef0d944f0b1549b0.png][]

<table style=""> 
 <tbody> 
  <tr> 
   <td style="width:713px;vertical-align:top;height:51px;"><p style="">老师类</p><p style="">学生类</p><p style="">老师带了很多学生 </p><p style="">把学生存倒数组中 Student[] stus = new Student[n]; // 数组长度为n</p></td> 
  </tr> 
 </tbody> 
</table>

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());
        }
    }

![958436b537e0e37e0124adea0bcbd645.png][]

[72d681eb09cba904ef0d944f0b1549b0.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/92cea4790d064f31a431e9bd0fddd1ba.png
[958436b537e0e37e0124adea0bcbd645.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/27/52bfc8b7743748ccbf30d93f7c25c825.png