Question

我有一个函数，如果声明的枚举仅包含给定的值，则可以设置该值。然后，我试图通过get方法获取值，但是我正在获取默认值。 setter方法没有获取新值并进行更新。

public enum BranchLocations {ONE,TWO,THREE,FOUR,FIVE};

private String BranchName ="Branch Name";

    public boolean setBranchLocation(String branchLocation) {
        for (BranchLocations b : BranchLocations.values()) {
            if (b.name().equals(branchLocation)) {
                this.BranchName = branchLocation;
                return true;
            }
        }
        return false;
    }

    public String getBranchLocation() {
        return this.BranchName ;
    }

我目前正在学习枚举，对此并不十分熟悉。我只是通过for循环和.equals方法

检查值是否包含在枚举中

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public class Main {
    public static void main(String[] args){

        Bank bank = new Bank("LhblVEWZXmtjn3gMykBaqfN& &h", Bank.BranchLocations.values()[0]);
        System.out.println(Bank.BranchLocations.values()[0]);
        System.out.println(Bank.BranchLocations.values()[1].toString());
        String newBranchLocation = Bank.BranchLocations.values()[1].toString();
        System.out.println(bank.getBranchLocation());
        bank.setBranchLocation(newBranchLocation);
        System.out.println(bank.getBranchLocation());
        System.out.println(
        (bank.setBranchLocation(newBranchLocation) && bank.getBranchLocation().equals(newBranchLocation)));

    }
}

Answer 1

public enum BranchLocations {

    ONE("ONE"),
    TWO("TWO"),
    THREE("THREE"),
    FOUR("FOUR"),
    FIVE("FIVE");

    private String BranchName = new String();

    BranchLocations(String val){BranchName = val;}

    public String getBranchLocation() {return BranchName;}

    public boolean setBranchLocation(String branchLocation) {
        for (BranchLocations b : BranchLocations.values()) {
            if (b.name().equals(branchLocation)) {
                this.BranchName = branchLocation;
                return true;
            }
        }
        return false;
    }

}

Answer 2

在枚举中，您只是声明了名称，而不是值。但是，在您的方法中，您正在检索测试的值。这不是预期的行为。

要做：

if (b.toString().equals(branchLocation)) {
   this.BranchName = branchLocation;
   return true;
}

或为枚举中的每个名称定义一个值：

public enum BranchLocations {
    ONE("ONE"),
    TWO("TWO"),
    THREE("THREE"),
    FOUR("FOUR"),
    FIVE("FIVE")
};

为什么我的函数未返回正确的值

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2 个答案: