Start coding Java8(early access) simple 3 step.
Impressed JavaOne2013
1.download & install Java8(early access)
You can download Java8 early access version from here.
https://jdk8.java.net/download.html
2.choose IDE
You can use NetBeans or IntelliJ for coding by Java8.
Now, Eclipse doesn't support Java8 yet.
NetBeans
http://bits.netbeans.org/dev/nightly/latest/
IntelliJ(Community version is free)
http://www.jetbrains.com/idea/download/
3.(IntteliJ)Using java8 in IDE
Create new project
Add jdk8(Project SDK) you installed.
Here is the default java path(mac).
ls -ltr /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java -rwxrwxr-x 1 root wheel 99296 6 14 06:57 /Library/Java/JavaVirtualMachines/jdk1.8.0.jdk/Contents/Home/bin/java
Create Java class.
Let's Cording.