15. The Object Class: Root of All

Scenario

Every class in Java implicitly extends java.lang.Object. Learn how overriding toString() and equals() changes default behavior.

Code Block

class Book {
    String title;
    Book(String title) { this.title = title; }

    @Override
    public String toString() {
        return "Book Title: " + title;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (!(obj instanceof Book)) return false;
        return this.title.equals(((Book) obj).title);
    }
}

public class Main {
    public static void main(String[] args) {
        Book b1 = new Book("Java Mastery");
        Book b2 = new Book("Java Mastery");
        
        System.out.println(b1); // Calls toString()
        System.out.println("Memory Compare: " + (b1 == b2));
        System.out.println("Value Compare: " + b1.equals(b2));
    }
}

Take Your Shot

Predicted Output

Type exactly what you think will be printed in the console.