NTT DATA, Inc. Associate/Senior Associate -(Technical) Interview Questions and Answers

Joinkeys is a utility in Mainframe SORT that allows merging of two or more files based on a common key.

• Joinkeys is used to merge two or more files based on a common key.

• It is used in Mainframe SORT utility.

• Joinkeys can be used to merge files with different record formats.

• It can also be used to merge files with different record lengths.

• Joinkeys can be used to merge files with different sort orders.

• Joinkeys can be used t

Abstract classes are classes that cannot be instantiated and can have both abstract and non-abstract methods. Interfaces are contracts that define a set of methods that a class must implement.

• Abstract classes can have constructors, while interfaces cannot.

• A class can implement multiple interfaces, but can only inherit from one abstract class.

• Abstract classes can have instance variables, while interfaces cannot.

• An examp...read more

SOLID is a set of design principles for object-oriented programming.

• S - Single Responsibility Principle: A class should have only one reason to change.

• O - Open/Closed Principle: A class should be open for extension but closed for modification.

• L - Liskov Substitution Principle: Subtypes should be substitutable for their base types.

• I - Interface Segregation Principle: A client should not be forced to depend on methods it...read more