How do you write a generic method in Java? Java में generic method कैसे लिखें?

A generic method declares its own type parameter(s), independent of the class it's in, using angle brackets right before the return type.

public class Utility {
    // Generic method - <T> before the return type declares the type parameter
    public static <T> void printArray(T[] array) {
        for (T item : array) {
            System.out.println(item);
        }
    }

    // Generic method with a return type using the type parameter
    public static <T> T getFirst(List<T> list) {
        return list.isEmpty() ? null : list.get(0);
    }

    // Multiple type parameters
    public static <K, V> Map<V, K> invertMap(Map<K, V> original) {
        Map<V, K> inverted = new HashMap<>();
        for (Map.Entry<K, V> entry : original.entrySet()) {
            inverted.put(entry.getValue(), entry.getKey());
        }
        return inverted;
    }

    // Bounded generic method
    public static <T extends Comparable<T>> T findMax(List<T> list) {
        T max = list.get(0);
        for (T item : list) {
            if (item.compareTo(max) > 0) max = item;
        }
        return max;
    }
}

// Usage - type is usually INFERRED, no need to specify explicitly
Integer[] numbers = {1, 2, 3};
Utility.printArray(numbers);  // T inferred as Integer

String first = Utility.getFirst(List.of('a', 'b', 'c'));  // T inferred as String

// Explicit type witness (rarely needed)
Utility.<String>printArray(new String[]{'x', 'y'});