Java枚举类个人简单理解和使用enum

原创已于 2022-10-30 12:36:24 修改 · 354 阅读

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于 2022-10-29 17:15:33 首次发布

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博客围绕Java枚举类展开，介绍了枚举类对象实例化、对象实例与构造方法的对应关系、构造函数复用情况，还进行了对象赋值输出对比和实例间比较，并给出了代码实例。

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1.枚举类对象实例化

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2.枚举类的对象实例和构造方法逐个对应

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3.枚举类中的构造函数多次复用

4.枚举类对象赋值输出对比

5.枚举类对象实例之间的比较

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6.代码实例

package Test;
public  enum  Student {
    student1("小刚"), student2("小红","15"), student3("小花","25","女");
    private static final String ceshi  = "测试住址";private static final String ce_sex  = "男";private static final String name  = "赋予名字";
    private String userName;private String age;private String sex;private String address;
    private   Student() {
        this(Student.name,Student.ce_sex,Student.ceshi);
    }
    private   Student(String userName) {
        this(userName,Student.ce_sex,Student.ceshi);
    }

    private   Student(String userName, String age) {
        this(userName,age,Student.ce_sex,Student.ceshi);
    }

    private   Student(String userName, String age, String sex) {
        this(userName,age,sex,Student.ceshi);
    }

    private   Student(String userName, String age, String sex, String address) {
        this.userName = userName;
        this.age = age;
        this.sex = sex;
        this.address = address;
    }
    public String getUserName() {
        return userName;
    }
    public String getAge() {
        return age;
    }
    public String getSex() {
        return sex;
    }
    public String getAddress() {
        return address;
    }
    @Override
    public String toString() {
        return "Student{" + "userName='" + userName + '\'' + ", age='" + age + ',' + ", sex='" + sex + ',' + ", address='" + address + '\'' + '}';
    }
    public   boolean  isTrue(){
        System.out.println("this=="+this);
        System.out.println("student2=="+student2);
       return  this ==student2 ;
    }
    public static void main(String[] args) {
       Student s1 = Student.student1;System.out.println(s1.toString());
       Student s2 = Student.student2;System.out.println(s2.toString());
       Student s3 = Student.student3;System.out.println(s3.toString());
         //枚举类对象之间的比较
          System.out.println( Student.student2.isTrue());
    }
}