How to properly install Java in OS X When I look at System Preferences > Java > Update, I see 


  Your system has the recommended version of Java.
  Java 7 Update 79

From Terminal, java -version:


  java version "1.7.0_71"
  Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
  Java HotSpot(TM) 64-Bit Server VM (build 24.71-b01, mixed mode)

From Terminal, export:


  JAVA_HOME="/Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home"

In addition to that, I also have the Java from Apple/Oracle installed as well (when first prompted to install when opening a Java-based app when there's no Java yet installed)


Questions:


Is Java 7 Update 79 == jdk1.7.0._71.jdk? Or are these separate?
When running some thing with Java, there is always the following: 


  objc[63077]: Class JavaLaunchHelper is implemented in both
  /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/jre/bin/java
  and
  /Library/Java/JavaVirtualMachines/jdk1.7.0_71.jdk/Contents/Home/jre/lib/libinstrument.dylib.
  One of the two will be used. Which one is undefined.



I'd be more than willing starting from scratch had I understood the steps to do that properly (remove, re-install). If it matters, am running OS X 10.10.
System Preferences shows the Java used for web applets and java -version the one found by /usr/bin/java

To get the latter install the JDK not the JRE