Storing Double in ArrayList

Question

我有一个Integer类型的ArrayList，是否可以在其中存储一个值（例如1.25）而不必将其强制转换为int，因此在小数点后丢失位？

Answer 1

No, you cannot store doubles in ArrayList<Integer> without loss of precision. You can, however, store them in ArrayList<Double> .

Answer 2

Use ArrayList<Number> instead. In this way, you will be able to store both Double and Integer instances since both classes derive from Number class.