Quantitative Aptitude Questions. Problem on Trains, Probability, Percentage and Basic Questions of Technical depends on your choice(C,C++, Java, Sql, etc) What is singleton in java. Moderate level interview process, C++, JAVA, C, Databases-SQL,MySQl,Oracle -Inheritance, Polymorphism, Object, Class, Abstract Class, Interface, Garbage Collection, Exception handling, nested classes, list, map, linked list -Pointers, Calling by reference, Call by Value, Command line arguments - Logic puzzle and code snippets What is the command to change permission of file