枚举类型在switch语句中的用法

/** * 用户类型枚举类, 用于区分用户的身份. */ 
public enum UserType {     
STUDENT(1), TEACHER(2), PARENT(3), SCHOOL_ADMIN(4), UNKNOWN(-1);

private int value;

UserType(int value) {
this.value = value; 
} 

    public int getValue() {
return value;
}

public String getStringValue() {
return String.valueOf(value);
}

public static UserType valueOf(int value) { 
UserType userType = null; 
switch (value) { 
case 1: 
userType = STUDENT;
            break;
case 2: 
userType = TEACHER; 
break;
case 3:
userType = PARENT;
            break;