Ruby's comparator <=> Vs. Java's .equals; to compare Strings

Question

Her is my ruby script:

books = ["Charlie and the Chocolate Factory", "War and Peace", "Utopia", "A Brief History of Time", "A Wrinkle in Time"]

puts books.sort! {

  |firstBook, secondBook|

  firstBook <=> secondBook

}

I was expecting it would print -1,0 or 1, but it prints book's name. How to get their boolean value in console.

Similarly in Java my code is:

public class sampletest {

    public static void main(String[] args) {
        String String1 = "hello";
        String String2 = "Hello";

        System.out.println(String1.equals(String2));
    }
}

Here output is: True (a Boolean value) I am new to Ruby, I don't understand the difference between these two

Answer 1

In the first example, you sort (involving lots of comparisons that you don't get to see). In the second example, you just compare. The Ruby equivalent of your Java snippet is:

string1 = "hello"
string2 = "Hello"
puts(string1 == string2)