제네릭

// 제네릭 클래스
class Box<T> {
    private T content;

    public Box(T content) {
        this.content = content;
    }

    public T getContent() { return content; }
    public String getType() { return content.getClass().getSimpleName(); }
}

// 제네릭 메서드
class Utils {
    public static <T extends Comparable<T>> T max(T a, T b) {
        return a.compareTo(b) > 0 ? a : b;
    }
}

public class GenericDemo {
    public static void main(String[] args) {
        Box<String> sBox = new Box<>("Hello");
        Box<Integer> iBox = new Box<>(42);

        System.out.println(sBox.getContent());  // Hello
        System.out.println(iBox.getType());     // Integer

        System.out.println(Utils.max(3, 7));       // 7
        System.out.println(Utils.max("apple", "banana")); // banana
    }
}