Java

Question

public void loadTill() throws IOException {
    Scanner infile = new Scanner(new FileReader(SHOP_TILL_DATA_FILE));


    int tillSize = infile.nextInt();
    for (int i = 0;i<tillSize*2;i++){


    UKDenomination ct =infile.next();
    int nc = infile.nextInt();

    DenominationFloat m = new DenominationFloat(ct, nc);

    till.addFloat(m);
    }

}

我希望 ct 是 UKDenomination 类型，我是 java 的新手，还没有完全掌握....

注意：英国面额是一个枚举

有多种声明UKdenomination的方法如下所示 1)

public static UKDenomination fromString(String strValue)

2)

private UKDenomination(int v) {
        value = v;
    }

3)

public enum UKDenomination {

Answer 1

您必须实例化您的对象，然后使用您的方法填充它，请尝试以下操作：

UKDenomination ct = new UKDenomination();
ct = ct.fromString( infile.next());

编辑：

如果是枚举，那么你不能将输入保存为这个枚举的新类型，因为引用Oracle Enum Docs只有一个构造函数，我们不能使用它（它只被使用由编译器）：

protected Enum(String name, int ordinal)

Sole constructor. Programmers cannot invoke this constructor. It is for use by code emitted by the compiler in response to enum type declarations. Parameters:

name - - The name of this enum constant, which is the identifier used to declare it.

ordinal - - The ordinal of this enumeration constant (its position in the enum declaration, where the initial constant is assigned an ordinal of zero).

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