I sister a, just learn Java, met TreeSet () with no problems, hope help me to solve, thank you very much,


Cannot resolve type java.util.Com parator, from the necessary class files indirect reference to it

CodePudding user response:

The JDK? Code is no problem, can, you can first with jdk8

CodePudding user response:

The JDK 8 version is no problem, try to replace the JDK