Início / coding / Perguntas / 79215995
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ArtBindu
Asked: 2024-11-23 01:22:32 +0800 CST

Função genérica Java ENUM [duplicado]

  • 772

Tenho dois ENUM com as mesmas chaves, mas keyValues ​​diferentes, como segue:

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;
    }
}

Quero criar uma função genérica ( printGenericEnumInfo) para imprimir qualquer uma dessas chaves ENUM.

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);
    }
}

Você pode me ajudar a fazer isso?

Código de demonstração: tutorialspoint_JavaCompiler

java

1 respostas

  1. Best Answer

    As duas enumerações devem implementar essa interface:

    interface HasEnumKey {
    String getEnumKey();
}

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

    Então o método pode tomar um Class<T>representando a classe enum. Constrain Tpara ser um enum e implementar HasEnumKey,

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

    Uso:

    printGenericEnumInfo(STUDENT_INFO.class);
    • 5

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