Design Patterns Update to JDK25

JDK 25 introduces enhanced switch statements and pattern matching capabilities that modernize the implementation of classic design patterns. The release includes significant JEPs like Stream Gatherers, Unnamed Variables & Patterns, and Compact Source Files with Instance Main Methods. These features enable more functional programming approaches, improving code readability and maintainability while addressing complex implementation challenges across Creational, Structural, and Behavioral design patterns.