JComboBox是原始类型.应参数化对泛型类型JComboBox <E>的引用

Question

String[] boxOptions = {"1","2","4","8","16","20","40","100","400"};
JComboBox box = new JComboBox(boxOptions);

我以前在我的程序中有这些确切的代码行,并没有收到此错误.我做了一些搜索,我发现的结果有点过头了.有任何想法吗？

错误是:

JComboBox is a raw type. References to generic type JComboBox<E> should be parameterized

Answer 1

您可以使用:

JComboBox<String> box = new JComboBox<>(boxOptions);

这JComboBox是因为现在是一个通用类.

Answer 2

从Java 7开始,泛型被引入到JComboBox组件中.也许你之前使用的是Java6.你应该在JComboBox<String>那里添加第二行.