通用语法符号<〜> [英] Generic syntax symbol <~>

问题描述

使用NetBeans或IDEA等IDE，我发现他们正在将泛型类型转换为此符号：

Working with IDE like NetBeans or IDEA, i've seen that they are converting generic types into this symbol:

private final List<String> ar = new ArrayList<~>();

但在简单的编辑器中使用它会导致抛出错误。 BTW Eclipse也不喜欢它。它是否以某种方式与类型擦除机制相关联？

But using this in a simple editor results in throwing an error. BTW Eclipse also doesn't like it. Is it somehow connected with type erasure mechanism?

推荐答案

你会在IntelliJ中看到它的颜色不同！

You will see that in IntelliJ its a different colour!

这是因为它使用代码折叠来隐藏代码，但你不能用Java 6这样写它。

This is because it has used code folding to hide the code, but you can't write it this way in Java 6.

在Java 7中，您可以编写

In Java 7 you can write

private final List<String> ar = new ArrayList<>();

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