Java:子类化泛型类

Question

我有一个通用类，我希望按如下方式对其进行子类化:

public class SomeTable<T extends BaseTableEntry>
    extends BaseTable<T>
{

    public SomeTable(int rows, int cols)
    {
        super(rows, cols, SomeTableEntry.class);
        //Does not compile:
        //Cannot find symbol: constructor BaseTable(int, int, java.lang.Class<blah.blah.SomeTableEntry.class>)
    }
}

...通用父类(super class)是:

public class BaseTable<T extends BaseTableEntry>
{

    public BaseTable(int rows, int cols, Class<T> clasz)
    {
        ...
    }
...
}

我理解编译器错误，但似乎找不到解决方法，只能在 SomeTable 构造函数中包含一个额外参数。

有什么建议吗？

谢谢!

Answer 1

编译:

public class SomeTable extends BaseTable<SomeTableEntry> {
    public SomeTable(int rows, int cols)
    {
        super(rows, cols, SomeTableEntry.class);
    }
}

它适用于类型转换:

public class SomeTable<T extends BaseTableEntry> extends BaseTable<T> {
    public SomeTable(int rows, int cols)
    {
        super(rows, cols, (Class<T>)SomeTableEntry.class);
    }
}

但我期待有人发布解释为什么编译器需要对类进行强制转换。