Java , Android , Java EE

\n How diferent is Java used in Android apps development from java used to develop regular java applications?\n\n\nFrom a language point of view, almost identical.\n\nFrom an user interface API and application life-cycle point of view, almost completely different.\n\n\n Can i use the skills acquired by developing Java Android applications in Java EE web development?\n\n\nYes. Your pure \"Java-skills\" will come in handy for sure. But as said above, the application life-cycle for instance, is completely different from most other scenarios.\n\n\n What is Java ME all about ?\n\n\nJavaME is an older technique, typically used for phones without touch screens. It defines (compared to Android) a very minimal API and was originally designed to run on very limited devices compared to todays smart phones.",

Android is, roughly, JavaSE without some of the more specialized features, like security layers (JSE and JAAS), GUI (AWT, Swing and Java2D).\n\nAndroid's API uses the JavaME class hierarchie for OpenGL ES.\n\nSo if you know Android, you can easily move to JavaSE development.\n\nJavaEE relies on JavaSE, but it's about server applications, so you will have to learn how it works. Look for servlets, JSP and JSF to learn more about it.\n\nJavaME is slightly different than JavaSE. JavaME's API is smaller and less powerful than JavaSE, and slightly different.",

Well, in order to develop both for Android, Java ME and Java EE the base thing to know is Java SE. Java ME is getting old. The most popular staff to develop in Java ME is software for Blackberry.\nJava EE development is pretty hard to learn technology, cause it actually consists of a big ammount of frameworks and smaller technologies. It's complicated because of many things, but, definately in order to use it you should start learning Hibernate/JPA, Java SE, RMI and OOP itself. Then you may look into Spring technology.",