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GeezerVison is showing github.com — JavaTutorial/src/30_AbstractKeyword.java at master · kankwu/JavaTutorial Expand file tree/ Copy path30_AbstractKeyword.javaMore file actions 48 lines (36 loc) · 1.02 KB / Copy path30_AbstractKeyword.javaFile metadata and controls48 lines (36 loc) · 1.02 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 /** * * Abstract Class and Abstract Methods * */ public class Main { public static void main(String[] args) { // new Animal(); // Not Allowed. Cannot create objects of abstract class. Animal animal; // Allowed. You can create reference of abstract class. Animal animal1 = new Dog(); // Parent class reference --> Child class object animal1.eat(); animal1.run(); } } abstract class Animal { public void run() { System.out.println("Animal is running"); } abstract public void eat(); } class Dog extends Animal { @Override public void eat() { System.out.println("Dog is eating"); } } /* * Rules for abstract keyword: * 1. abstract class: * * A class that is declared abstract * * You cannot create object of abstract class * * It may or may not contain abstract methods * * 2. abstract method: * * No method body. You cannot write code in abstract method. * * It is mandatory to override the abstract method in child class. * */ |
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