#abstract method

How to Call a Method in Java

What is a Method ? A method is a block of code that performs a particular task.  It can be invoked anywhere in a program . It increases code readability and reusability. When a compiler encounters a method name, it executes its body. After finishing the method execution, the control is sent back to the caller method’s immediate next statement.   How to Call a Method in Java ? Calling an Instance…

Abstraction in Java

Abstraction is a concept to show only essential detail i.e hide internal detail and show functionality in simple terms. To achieve abstraction in Java, use abstract class or interface.

Example: In ATM we don’t know how internally work. In a Car don’t know about the internal mechanism.

Ways to achieve Abstraction

We can achieve abstraction in two ways:

Abstract class:abstractio…

Java 8: Functional Interface

“An interface having exactly one abstract method is called Function Interface. Along with one abstract method can have any number of default and static methods.”

Points to Remember

This is also called as Single Abstract Method Interfaces or SAM Interfaces.

The default method having implementation is not considered as an abstract method.

An interface declares an abstract method overriding one of…

Java 8: Functional Interface

“An interface having exactly one abstract method is called Function Interface. Along with one abstract method can have any number of default and static methods.”

Points to Remember

This is also called as Single Abstract Method Interfaces or SAM Interfaces.

The default method having implementation is not considered as an abstract method.

An interface declares an abstract method overriding one of…

Abstract Modifier (class, method) in Java

abstract is a keyword modifier in java. Abstract modifier is applicable for the class and method only. Everything about abstract keyword is explained here with the help of examples. So let’s understand the abstract modifier in detail.

  Usage of Abstract Modifier :- 1) Abstract with Class :-

we can declare class with abstract modifier. If we want to…

abstract class Abs {                 int a;      //Instance Member                 static int b;          //Static Data Member                 static     //Static Block                 {                                 System.out.println("Hello Abs Class");                 }                 public static void hello() //Static Method                 {                                …