Scala 推断的类型参数[Any，Int]不符合方法的类型参数界限[T

我正在用Scala编写Minecraft Forge mod。我正在尝试为我的blockstate创建PropertyInteger。这在普通Java中工作得非常好。然而，Scala被证明很难让它工作，我相信这就是所谓的隐式类型

出于某种原因，这会产生此错误

val PROP_FEMALE:IProperty[java.lang.Integer] = PropertyInteger.create("female", 0,1)

worldIn.setBlockState(pos, state.withProperty(PROP_FEMALE, if (isFemale) 1 else 0), 2)

下面是PropertyInteger.create方法

下面是所有PropertyInteger类

---

那是一堵巨大的代码墙

我认为你的例子可以简化为以下两行：

public class PropertyInteger extends PropertyHelper<Integer>
{
    private final ImmutableSet<Integer> allowedValues;

    protected PropertyInteger(String name, int min, int max)
    {
        super(name, Integer.class);

        if (min < 0)
        {
            throw new IllegalArgumentException("Min value of " + name + " must be 0 or greater");
        }
        else if (max <= min)
        {
            throw new IllegalArgumentException("Max value of " + name + " must be greater than min (" + min + ")");
        }
        else
        {
            Set<Integer> set = Sets.<Integer>newHashSet();

            for (int i = min; i <= max; ++i)
            {
                set.add(Integer.valueOf(i));
            }

            this.allowedValues = ImmutableSet.copyOf(set);
        }
    }

    public Collection<Integer> getAllowedValues()
    {
        return this.allowedValues;
    }

    public boolean equals(Object p_equals_1_)
    {
        if (this == p_equals_1_)
        {
            return true;
        }
        else if (p_equals_1_ instanceof PropertyInteger && super.equals(p_equals_1_))
        {
            PropertyInteger propertyinteger = (PropertyInteger)p_equals_1_;
            return this.allowedValues.equals(propertyinteger.allowedValues);
        }
        else
        {
            return false;
        }
    }

    public int hashCode()
    {
        return 31 * super.hashCode() + this.allowedValues.hashCode();
    }

    public static PropertyInteger create(String name, int min, int max)
    {
        return new PropertyInteger(name, min, max);
    }

    public Optional<Integer> parseValue(String value)
    {
        try
        {
            Integer integer = Integer.valueOf(value);
            return this.allowedValues.contains(integer) ? Optional.of(integer) : Optional.absent();
        }
        catch (NumberFormatException var3)
        {
            return Optional.<Integer>absent();
        }
    }

    /**
     * Get the name for the given value.
     */
    public String getName(Integer value)
    {
        return value.toString();
    }
}

如果您将其传输回代码中，它应该有点像这样：

withProperty(42: java.lang.Integer, (if (true) 1 else 0): java.lang.Integer)

PropertyInteger类来自Minecraft的内部代码，虽然很大，但它包含在问题中以帮助理解问题。因此，我不认为这是多余的。

public static PropertyInteger create(String name, int min, int max)
{
    return new PropertyInteger(name, min, max);
}

public class PropertyInteger extends PropertyHelper<Integer>
{
    private final ImmutableSet<Integer> allowedValues;

    protected PropertyInteger(String name, int min, int max)
    {
        super(name, Integer.class);

        if (min < 0)
        {
            throw new IllegalArgumentException("Min value of " + name + " must be 0 or greater");
        }
        else if (max <= min)
        {
            throw new IllegalArgumentException("Max value of " + name + " must be greater than min (" + min + ")");
        }
        else
        {
            Set<Integer> set = Sets.<Integer>newHashSet();

            for (int i = min; i <= max; ++i)
            {
                set.add(Integer.valueOf(i));
            }

            this.allowedValues = ImmutableSet.copyOf(set);
        }
    }

    public Collection<Integer> getAllowedValues()
    {
        return this.allowedValues;
    }

    public boolean equals(Object p_equals_1_)
    {
        if (this == p_equals_1_)
        {
            return true;
        }
        else if (p_equals_1_ instanceof PropertyInteger && super.equals(p_equals_1_))
        {
            PropertyInteger propertyinteger = (PropertyInteger)p_equals_1_;
            return this.allowedValues.equals(propertyinteger.allowedValues);
        }
        else
        {
            return false;
        }
    }

    public int hashCode()
    {
        return 31 * super.hashCode() + this.allowedValues.hashCode();
    }

    public static PropertyInteger create(String name, int min, int max)
    {
        return new PropertyInteger(name, min, max);
    }

    public Optional<Integer> parseValue(String value)
    {
        try
        {
            Integer integer = Integer.valueOf(value);
            return this.allowedValues.contains(integer) ? Optional.of(integer) : Optional.absent();
        }
        catch (NumberFormatException var3)
        {
            return Optional.<Integer>absent();
        }
    }

    /**
     * Get the name for the given value.
     */
    public String getName(Integer value)
    {
        return value.toString();
    }
}

def withProperty[T <: Comparable[T], V <: T](k: T, v: V) = ()
withProperty(42: java.lang.Integer, 42)

withProperty(42: java.lang.Integer, (if (true) 1 else 0): java.lang.Integer)

worldIn.setBlockState(
  pos, 
  state.withProperty(PROP_FEMALE, (if (isFemale) 1 else 0): java.lang.Integer), 
  2
)