利用工厂方法创建不可变集合

/**
nowjava.com - 时  代  Java 提供 
**/

import java.util.ArrayList;

import java.util.List;

import java.util.Map;


public class Main {

    public static void main(String[] args){

        List<String> jvmLanguages = List.of("Java", "Scala", "JRuby", "Groovy", "Jython", "Kotlin");

        System.out.println(jvmLanguages);

        try {

            jvmLanguages.add("Exception");

        } catch (UnsupportedOperationException uoe){

            System.out.println(uoe);/** n o w j a   v  a . c o m - 时  代  Java 提 供 **/

        }

        Map <Integer, String> players = Map.of(1, "Ana Bates", 2, "Lady Mary", 3,