CollectionsCopyOf.java

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class CollectionsCopyOf {
	public static void main(String[] args) {
		List<String> muttableList = Arrays.asList("New", "Method", "To", "Copy");

		// Copy methods
		List<String> immutableList = List.copyOf(muttableList);
		immutableList.forEach(System.out::println);

		Set<String> immutableSet = Set.copyOf(muttableList);
		immutableSet.forEach(System.out::println);

		Map<String, String> immutableMap = Map.copyOf(Map.of("k1", "v1", "k2", "v2"));
		immutableMap.forEach((key, value) -> System.out.println(key + " = " + value));

	}
}