The Java runtime, java, is often in the same bin directory. If the installed version is older (i.e. it is Java 5 and you wish to use the more recent Java 7 release), you should proceed below with downloading and installing a JDK. It is possible that you have the Java runtime (JRE), but not the JDK.
Earlobe piercings typically heal completely within 4 to 6 weeks. However, ear cartilage piercings -- such as a tragus, conch or helix piercing -- do not heal fully for 3 to 6 months. Swelling and redness usually resolve fairly quickly, typically within about a week.
Takes long time: The regular ear piercing takes up to 8 weeks to heal, the cartilage piercing can take much longer, and you need to make sure that you clean and rotate earrings during all this time 2-3 times a day. If it has been longer than that, return to the place that did the piercing or go to your doctor.