This project shows "Hello, World!" with JEP-286: Local-Variable-Type-Inference (var helloWorld = "Hello, World!";)
with eclipse, for Java10 development, Eclipse Oxygen.3(4.7.3) and Java10(Beta) plug-in required.
see https://marketplace.eclipse.org/content/java-10-support-oxygen and download Eclipse Oxygen.3(4.7.3)
and install http://download.eclipse.org/eclipse/updates/4.7-P-builds/ in Eclipse > Help > Install New Software