CitiusTech interview questions

LinkedList Creation without using any Libarary,Reverser LinkedList without using any library, What is Sstem.out.print what It Do ?,Associacation,aggragation,Bean LifeCycle,what java 7 feature is how you use it, full form of nio(java 7 file feature),after creating .class what jvm do? heap memory regions,time complexity,hot to perform two different operation irrespective of N with same execution time,what springBootApplication annotation do,how to customize bean method?,postproccesorbean?,classloader,How spring read dependecy thoruh classpath (Internally) etc prepare very basic core and internal working

Is java completely object oriented language?