SAP Java Software Engineer interview questions

OOPs concepts, Problem Solving, Multi-threading questions.

1). Difference between ArrayList and LinkedList? 2). What is Map? 3). What is Vector? 4). Difference between Overloading and Overriding? 5). Can possible to create Object for Parent class with child class reference? ex: Class A{ //Statements } Class B extends A{ //Statements PSVM(){ B Reference_Variable=new A(); } } 6). What is Synchronization? 7). what is the time complexity of Arraylist and Linked List? 8). Write a program to print the higher version of a Value? Ex: Value1=7.3.4.2.5.9 Value2=7.3.2.3.8.1 o/p: 7.3.4.2.5.9 in these 2 values write a program to print the Higher Version? 9). Test case: "Hai i am SAP" O/P: "iaH i ma PAS" write a program in java for above O/P? 10). About Project? 11). Flow of execution of a project with Architecture? 12).Basic SQL Questions? (DDL DML TCl Commands) 13). About Agile/Driven Methodology? 14). What is final keyword? 15) what is Data hiding? 16) Design patterns? (Singleton Design Pattern program) 17). Internal implementation of HashSet?