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IntelliJ: http://www.jetbrains.com/idea/download/
Eclipse: http://downloadswiki.efxclipseeclipse.org/eclipse-java8/JDT_Core/Java8
Once you have downloaded and installed an IDE that is JDK8 aware, you will need to configure it to accept JDK8 syntax and generate the right byte codes. This will be explained later on for each particular IDE. If you use an IDE without JDK8 support, such as NetBeans 3.7.1, you will not be able to run from within the IDE.
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