Java NetBeans：-source 1.5 不支持菱形运算符（使用 -source 7 或更高版本启用菱形运算符）
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NetBeans : diamond operator is not supported in -source 1.5 (use -source 7 or higher to enable diamond operator)
提问by vuhoanghiep1993
I don't know why when I code:
我不知道为什么当我编码时：
List<String> data = new ArrayList<>();
it said that
它说
diamond operator is not supported in -source 1.5 (use -source 7 or higher to enable diamond operator) ---- (Alt-Enter shows hints)
I already use JDK 1.7. When I opened it in eclipse, I didn't get that error.
我已经在使用 JDK 1.7。当我在 eclipse 中打开它时，我没有收到那个错误。
采纳答案by Radim
-source 1.5means your code will be compatible with Java version 1.5 and cannot use language constructs introduced later. Read http://docs.oracle.com/javase/8/docs/technotes/tools/unix/javac.htmlto find more.
-source 1.5意味着您的代码将与 Java 1.5 版兼容，并且不能使用稍后引入的语言结构。阅读http://docs.oracle.com/javase/8/docs/technotes/tools/unix/javac.html以了解更多信息。
Easy way to achieve what you want (to be able to use diamond operator added in Java 7) is to update project source/binary version in project customizer - go to Projectstab (Ctrl-1), select project node, choose Propertiesin its context menu and update Source/Binary Formatfield in Source tab.
实现您想要的（能够使用 Java 7 中添加的菱形运算符）的简单方法是在项目定制器中更新项目源/二进制版本 - 转到Projects选项卡 (Ctrl-1)，选择项目节点，Properties在其上下文菜单中选择并更新Source/Binary Format源选项卡中的字段。
回答by Ale
You missed this:
你错过了这个：
List<String> data = new ArrayList<String>();
List< String> data = new ArrayList< String>();
You have to put "String" in both "<>"
你必须在两个“<>”中都加上“String”
回答by Ruthe
right click and choose Properties follow this picture and select new version of source
右键单击并选择属性按照此图片并选择新版本的源
