This tutorial explores several techniques to mask a Java String while keeping the last N characters visible. Examples include masking using char arrays, substring manipulation, regular expressions, and the repeat() method available in Java 11. Each method is demonstrated with code snippets and unit tests to verify their correctness.
Table of contents
1. Overview2. Introduction to the Problem3. Using char Array4. Two Substrings5. Using Regex6. Using the repeat() Method7. ConclusionSort: