How to enable Developer options or menu on an Android Phone

On the phone, select Settings -> About Phone. Locate the option called Build number and press on it 7 times in succession.

You will then find that Developer Options is enabled in the About Phone menu.

Error building Java Program in Eclipse Mars after changing Java version

Right Click on the Project in the Package Explorer. Select Build Path -> Configure Build Path -> Libraries. Now remove JRE System Library 1.7 and add the one for java-8-oracle by clicking on Add Library -> JRE System Library -> Click Execution Environment and set that to JavaSE-1.8 (java-8-oracle). Click Finish.

This resolves the error . . . → Read More: Error building Java Program in Eclipse Mars after changing Java version

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