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.
Until the piercing has healed, taking the earring post out of the hole will only expose your raw tissue to infection. For ear piercings, the healing process typically takes 6-8 weeks. During that time, you must wear the earring you put into your new piercing at all times or risk a painful infection. Other parts of the body, such as belly buttons, may take longer to heal.