This is an android application in which almost all major topics related to JAVA programming language are covered like core java, Class, Exception, Threading, Remote Method Invocation, Socket Programming, AWT, Applet ,Java Server Page(JSP), Java Server Face (JSF), Servlet, Struts, Hibernate, Spring, Eclipse IDE, SQL, SQL Server etc. Now you have no need to carry several books , all information is available on one click. You will find around 1000 interview question of java programming language.Best Of Luck
Great app, would highly recommend it!