Create 03B. Thesis inherits book

Week 5: Class hierarchies/03B. Thesis inherits book

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+The program defines the class 'Book'. 
+
+An object can be created from a class by giving it a name and an author as follows:
+Book b = new Book("Old Man and the Sea", "Ernest Hemingway");
+
+
+
+Write the class 'Thesis', which inherits the class Book.
+
+The class has the following properties:
+A constructor that takes as parameters the name, the author, and the grade (integer).
+The constructor sets the name and author by calling the parent class constructor.
+The grade is an attribute of the Thesis class.
+Set and get methods for grade
+
+
+
+
+import java.util.Random;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        String[] authors = {"Sam Student", "Sally Student", "Alex Average",
+                "Ethan Excellent", "Fiona Flunked"};
+        
+        String[] names = {"Thesis", "Term Paper", "Masters thesis"};
+        
+        for (int testi=1; testi<=3; testi++) {
+            String author = authors[r.nextInt(authors.length)];
+            String name = names[r.nextInt(names.length)];
+            
+            Thesis lt = new Thesis(name, author, r.nextInt(5) + 1);
+            System.out.println("Thesis object created!");
+            Book k = (Book) lt;
+            System.out.println("Author: " + k.getAuthor());
+            System.out.println("Name: " + k.getName());
+            System.out.println("Grade:" + lt.getGrade());
+            System.out.println("Changing grade...");
+            if (r.nextInt(2) == 0) {
+                lt.setGrade(lt.getGrade() - 1);
+            } else {
+                lt.setGrade(lt.getGrade() + 1);
+            }
+            System.out.println("Grade:" + lt.getGrade());
+            System.out.println("");
+            
+        }
+    }
+}
+
+
+class Book {
+    private String name;
+    private String author;
+    
+    public Book(String name, String author) {
+        this.name = name;
+        this.author = author;
+    }
+      
+    public String getName() {
+        return name;
+    }
+    
+    public void setName(String name) {
+        this.name = name;
+    }
+    
+    public String getAuthor() {
+        return author;
+    }
+    
+    public void setAuthor(String author) {
+        this.author = author;
+    }   
+}
+
+
+class Thesis extends Book {
+    //subclass attributes
+    private int grade;
+    
+    //constructor
+    public Thesis(String name, String author, int grade) {
+      super(name, author);
+      this.grade = grade;
+    }
+
+    public int getGrade() {
+      return this.grade;
+    }
+
+    public void setGrade(int grade) {
+      this.grade = grade;
+    }
+}
+
+
+
+
+Thesis object created!
+Author: Sam Student
+Name: Masters thesis
+Grade:1
+Changing grade...
+Grade:2
+
+Thesis object created!
+Author: Sam Student
+Name: Masters thesis
+Grade:1
+Changing grade...
+Grade:2
+
+Thesis object created!
+Author: Alex Average
+Name: Term Paper
+Grade:1
+Changing grade...
+Grade:0
+
+
+