Question

我有一个扩展Trait的类，我想编写可以与类混合的Traits并覆盖一些方法。

我的课程所延伸的特性看起来像这样

int progress = 70;
imageView.setImageBitmap(getCroppedBitmap(originalPhotoBitmap, progress));

扩展CharSource的类

trait CharSource  {

    def source: Iterator[Char]
    def words: Iterator[String] = { 
        while(source.hasNext){
           //Logic to get the next word from a Char Iterator
        }
    }

    final def chars: Iterator[Char] = words.toString().toIterator
}

现在我想写一个特性来覆盖IteratorDocutmentSource中的源def以获得一些特殊行为

class IteratorDocumentSource(iterator: Iterator[Char]) extends CharSource {
   def source = iterator
}

PunctioationRemover扩展的变换器特性

trait PunctuationRemover extends Transformer {self: CharSource =>
override

  /** Character source.  Overriding should be in terms of `super.source` for           
  stackability. */
  abstract val source: Iterator[Char] = {
    super.source
    //additional logic ...
  }
}

拨打电话时出错

trait Transformer {self: CharSource =>

  protected def source: Iterator[Char]
  def words: Iterator[String]
}

错误：

异常或错误导致运行中止：
SampleSuite $$ anonfun $ $$ 2不久$ $ 3.document $$ PunctuationRemover超级$源（）Lscala /收集/迭代器; java.lang.AbstractMethodError： SampleSuite $$ anonfun $ $$ 2不久$ $ 3.document $$ PunctuationRemover超级$源（）Lscala /收集/迭代;

我引用了这篇文章，但我认为我的情况有点不同 Can I override a scala class method with a method from a trait?

引用Trait中的父类

0 个答案: