Java枚举使用及原理

//定义功课的枚举，每一门功课都有一个老师，通过构造方法传入
public enum Subject {
CHINESE(“王老师”),
MATH(“张老师”),
ENGLISH(“Mr. Yang”);

private String teacherName;

//枚举的构造方法访问权限默认是私有的，因为枚举是常量，各个枚举常量，枚举值的个数在编译期间就定义好了的，在运行时不能被改变
private Subject(String teacherName) {
    if (teacherName != null && !teacherName.isEmpty())
        this.teacherName = teacherName;
}

public String getTeacherName(http://by.xxadc.com/) {
    return teacherName;
}

public void setTeacherName(String teacherName) {
    this.teacherName = teacherName;
}
//实例代码块
{
    teacherName = "未知";
}

}