I don't know why when I code:
List<String> data = new ArrayList<>();
it said that
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.
-source 1.5
means 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.html to find more.
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 Projects
tab (Ctrl-1), select project node, choose Properties
in its context menu and update Source/Binary Format
field in Source tab.
You missed this:
List< String > data = new ArrayList< String >();
You have to put "String" in both "<>"
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.