guava之ImmuableSet,ImmuableList

原创于 2016-12-28 16:06:09 发布 · 722 阅读

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本文介绍了Java中不可变集合ImmutableSet的使用方法及其特点，包括创建不可变集合及通过Builder模式添加元素的过程。同时对比了ImmutableList的操作灵活性。

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ImmuableSet不可变集合,方法比较简单,效率高

  ImmutableSet<String> immuSet = ImmutableSet.of("first", "second");
        immuSet = ImmutableSet.copyOf(new String[]{"first", "second", "third"});
//        immuSet.add("third");//报错
        UnmodifiableIterator u = immuSet.iterator();
        while (u.hasNext())
            System.out.println(u.next());

        System.out.println("=================================");

        ImmutableSet.Builder builder = immuSet.builder();
        builder.add("forth", "fifth");
        immuSet = builder.build();

        u = immuSet.iterator();
        while (u.hasNext())
            System.out.println(u.next());

        System.out.println("=================================");

        ImmutableList<String> immulist = immuSet.asList();

        immulist.parallelStream().forEach(System.out::println);