Public abstract interface IManupulation{ //Interface declarationPublic abstract void add();//method declarationpublic abstract void subtract();}All the methods in the interface are internally public abstract void. All the variables in the interface are internally public static final that is constants....
Follow-up questionsIf the interview candidate comes up with one of the above solutions without mentioning any drawbacks, ask whether this approach is perfect.If using default interface methods, there is still a corner case where compilation might break: if the implementing class has a method with...
It’s a great design question and asked a lot in java interviews. This post provides all the differences between abstract class and interface. When should we use interface over the abstract class and vice versa? The post also explains how to use abstract class and interface to create a flexi...
public static void main(String[] args) { MyInterface.display(); } } 100) Can an interface be final? No, an interface cannot be final because final prevents inheritance, and interfaces are designed to be implemented by classes. private methods were introduced in Java 9, allowing an interface...
Polymorphism is one interface with many implementations. This characteristic allows you to assign a different meaning or usage to something in different contexts. For example, you can use polymorphisms to enable more than one form for entities, such as variables, functions, or objects. ...
If you’re interviewing for a Java programming role, then your coding skills will probably be tested. Whether you’re a beginner in Java or an expert programmer, this article provides some common Java interview questions and answers to help you prepare. ...
Java Interview Questions Part 7 What are the functions of the JDBC Connection interface? TheConnection interfacemaintains a session with the database. It can be used for transaction management. It provides factory methods that return the instance of Statement, PreparedStatement, CallableStatement, and ...
How would you differentiate between an abstract class and an interface?Sample answer: An abstract class can have both abstract and non-abstract methods and can also have fields, but interfaces contain only abstract methods and constants. What is multi-threading in Java?Sample answer: Multi-threadin...
@FunctionalInterfacepublicstaticinterfaceCheckedFunction<T> {voidapply(T t)throwsException; } publicvoidprocessTasks( List<Task> taks, CheckedFunction<Task> checkedFunction){for(Task task : taks) {try{ checkedFunction.apply(task); }catch(Exception e) {// ...} } } processTasks(taskList, t -...
6What is similarities/difference between an Abstract class and Interface? 6.1Similarities 6.1.1They can be used to implement the polymorphism. 6.1.2Both of them can not be instantiated. 6.2Differences 6.2.1Interface can be used to implement the multiple inheritances while the abstract can not. ...