StringBuilder vs String concatenation in toString() in Java

How to fix : failed to connect to localhost/127.0.0.1 android

how to fix : module not specified android studio

How to fix : Unable to connect to repository https://download.eclipse.org/ in eclipse

Unable to find valid certification path to requested target and

module not specified android studio

how to fix : module not specified android studio

Android Studio: Server's certificate is not trusted

Waiting for Target Device to Come Online

Unable to determine application id: com.android.tools.idea.run.ApkProvisionException: No outputs for

This compilation unit is not on the build path of a Java project

Error creating bean with name 'linkDiscoverers' defined in class path resource

Error “package android.support.v7.app does not exist”