java - 如何在java中开始使用泛型类型

Question

我的代码是:

class ReferenceRangeBuilder<T extends DvOrderedBuilder> {

private DvTextBuilder meaningBuilder;
private DvIntervalBuilder<T> rangeBuilder;
   public ReferenceRangeBuilder() throws ClassNotFoundException, InstantiationException, IllegalAccessException {

}

}

我想启动 rangeBuilder，以便我可以为其设置值。我想在构造函数内完成它。对于 DvIntervalBuilder rangeBuilder 我这样做是这样的:

 public DvIntervalBuilder() throws NoSuchFieldException, InstantiationException, IllegalAccessException, ClassNotFoundException {
        ParameterizedType pt = (ParameterizedType) getClass().getGenericSuperclass();
        // You may need this split or not, use logging to check
        String parameterClassName = pt.getActualTypeArguments()[0].toString().split("\\s")[1];

        T lower = (T) Class.forName(parameterClassName).newInstance();
        T upper = (T) Class.forName(parameterClassName).newInstance();

    }

Answer 1

我自己通过编写这样的构造函数解决了这个问题，感谢大家宝贵的时间和意见。

我的解决方案是:

public ReferenceRangeBuilder(Class<T> claz) {
    try {
        lowerReferenceRange = claz.newInstance();
        upperReferenceRange = claz.newInstance();
    } catch (InstantiationException ex) {
        Logger.getLogger(ReferenceRangeBuilder.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        Logger.getLogger(ReferenceRangeBuilder.class.getName()).log(Level.SEVERE, null, ex);
    }
}