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Author: neelshah2409

Java_abstract_class[Hackerrank].java

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+/*
+A Java abstract class is a class that can't be instantiated. That means you cannot create new instances of an abstract class. It works as a base for subclasses. You should learn about Java Inheritance before attempting this challenge.
+
+Following is an example of abstract class:
+
+abstract class Book{
+    String title;
+    abstract void setTitle(String s);
+    String getTitle(){
+        return title;
+    }
+}
+If you try to create an instance of this class like the following line you will get an error:
+
+Book new_novel=new Book(); 
+You have to create another class that extends the abstract class. Then you can create an instance of the new class.
+
+Notice that setTitle method is abstract too and has no body. That means you must implement the body of that method in the child class.
+
+In the editor, we have provided the abstract Book class and a Main class. In the Main class, we created an instance of a class called MyBook. Your task is to write just the MyBook class.
+
+Your class mustn't be public.
+
+Sample Input
+
+A tale of two cities
+Sample Output
+
+The title is: A tale of two cities
+
+*/
+
+
+
+import java.util.*;
+abstract class Book{
+	String title;
+	abstract void setTitle(String s);
+	String getTitle(){
+		return title;
+	}
+}
+
+class MyBook extends Book
+{
+   
+    void setTitle(String s){
+        title = s;
+    }
+}
+          
+
+
+
+public class Main{
+	
+	public static void main(String []args){
+		//Book new_novel=new Book(); This line prHMain.java:25: error: Book is abstract; cannot be instantiated
+		Scanner sc=new Scanner(System.in);
+		String title=sc.nextLine();
+		MyBook new_novel=new MyBook();
+		new_novel.setTitle(title);
+		System.out.println("The title is: "+new_novel.getTitle());
+      	sc.close();
+		
+	}
+}