3.3 Is "ABC">"abc"?

A. Introduction

No, all upper case letters are "less than" lower case letters. Among upper/lower case letters themselves, they are ordered alphabetically ascending. So, A<B<C<...<Z<a<b<c<...<z. But how to compare "!@#$" with "^*&>"?

B. Methods to compare strings:

1. boolean equals()

2. boolean equalsIgnoreCase()

3. int compareTo()

4. int compareToIgnoreCase()

5. trim()

6. toUpperCase()

7. toLowerCase()

C. Try: Create three strings, then sort them alphabetically and print out.