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ArtBindu
Asked: 2024-11-23 01:22:32 +0800 CST

Java ENUM 通用函数[重复]

  • 772

我有两个具有相同键但不同键值的 ENUM，如下所示：

enum STUDENT_INFO {
    NAME("Student Name"),
    AGE("Age"),
    DOB("Date of Birth"),
    SEX("Sex"),
    LOCATION1("Hostel Info"),
    LOCATION2("Permanent Address"),
    ID("Institution ID"),
    INSTITUTE("Institution Name");

    private final String enumKey;
    STUDENT_INFO(String enumKey) {
        this.enumKey = enumKey;
    }
    public String getEnumKey() {
        return enumKey;
    }
}

enum PERSON_INFO {
    NAME("Person Name"),
    AGE("Age"),
    DOB("Date of Birth"),
    SEX("Sex"),
    LOCATION1("Present Address"),
    LOCATION2("Permanent Address"),
    ID("Person ID"),
    INSTITUTE("Job Name");

    private final String enumKey;
    PERSON_INFO(String enumKey) {
        this.enumKey = enumKey;
    }
    public String getEnumKey() {
        return enumKey;
    }
}

我想创建一个通用函数（printGenericEnumInfo）来打印其中任何一个 ENUM 键。

class JavaTest {
    public static void printStudentEnumInfo() {
        System.out.println(STUDENT_INFO.NAME.getEnumKey());
        System.out.println(STUDENT_INFO.LOCATION1.getEnumKey());
        System.out.println(STUDENT_INFO.LOCATION2.getEnumKey());
    }

    // Generic Method to Print Enum Keys
    public static void printGenericEnumInfo(Enum<T> enumName) {
        System.out.println(enumName.NAME.getEnumKey());
        System.out.println(enumName.LOCATION1.getEnumKey());
        System.out.println(enumName.LOCATION2.getEnumKey());
    }
}

public class Main {
    public static void main(String[] args) {
        // Working perfectly
        JavaTest.printStudentEnumInfo();

        // How to implement this
        JavaTest.printGenericEnumInfo(STUDENT_INFO);
        JavaTest.printGenericEnumInfo(PERSON_INFO);
    }
}

你能帮我怎么做吗？

演示代码：tutorialspoint_JavaCompiler

java

1 个回答

  1. Best Answer

    这两个枚举都应该实现这样的接口：

    interface HasEnumKey {
    String getEnumKey();
}

enum STUDENT_INFO implements HasEnumKey { ... }
enum PERSON_INFO implements HasEnumKey { ... }

    然后该方法可以采用Class<T>表示枚举类的。约束T为枚举并实现HasEnumKey，

    static <T extends Enum<T> & HasEnumKey> void printGenericEnumInfo(Class<T> enumClass) {
    for (T value: enumClass.getEnumConstants()) {
        System.out.println(value.getEnumKey());
    }
}

    用法：

    printGenericEnumInfo(STUDENT_INFO.class);
    • 5

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