hutool的Opt工具类，非空判断

hutool的Opt工具类，非空判断

一月 05, 2022
该文章更新于 2022.01.05

一、Hutool🐂🍺：Opt (hutool-码云(gitee.com))

二、我的demo

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@Test
    void testHutool() {
        List<String> objects = new ArrayList<>();

        /*
         * 为空的情况
         * */
        System.out.println("\n\n\n为空的情况==================================");
        System.out.println("Opt.empty() = " + Opt.empty());
        System.out.println("Opt.of(objects) = " + Opt.of(objects));
        System.out.println("Opt.ofNullable(objects) = " + Opt.ofNullable(objects));
        System.out.println("Opt.ofBlankAble(objects) = " + Opt.ofBlankAble(objects));
        System.out.println("Opt.ofEmptyAble(objects) = " + Opt.ofEmptyAble(objects));
        System.out.println("objects.isEmpty() = " + objects.isEmpty());
        Opt.ofEmptyAble(objects).ifPresent(strings -> System.out.println("strings = " + strings));
        Opt.ofEmptyAble(objects).ifPresentOrElse(Console::log, () -> Console.error("传入的值不存在呢"));
        System.out.println("Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 10) = " + Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 10));
        Opt.ofEmptyAble(objects).peek(System.out::println);
        Opt.ofEmptyAble(objects).peeks(strings -> System.out.println("strings.size() = " + strings.size()));



        /*
        不为空的情况
         */
        System.out.println("\n\n\n不为空的情况==================================");
        objects.add("张三");
        objects.add("李四");
        objects.add("王五");
        objects.add("赵六");
        objects.add(null);
        objects.add(" ");
        System.out.println("Opt.of(objects) = " + Opt.of(objects));
        System.out.println("Opt.ofNullable(objects) = " + Opt.ofNullable(objects));
        System.out.println("Opt.ofBlankAble(objects) = " + Opt.ofBlankAble(objects));
        System.out.println("Opt.ofEmptyAble(objects) = " + Opt.ofEmptyAble(objects));
        System.out.println("Opt.ofEmptyAble(objects).get() = " + Opt.ofEmptyAble(objects).get());
        System.out.println("objects.isEmpty() = " + objects.isEmpty());
        Opt.ofEmptyAble(objects).ifPresent(strings -> System.out.println("strings = " + strings));
        Opt.ofEmptyAble(objects).ifPresentOrElse(Console::log, () -> Console.error("传入的值不存在呢"));
        System.out.println("Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 10) = " + Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 3));
        Opt.ofEmptyAble(objects).peek(System.out::println);
        Opt.ofEmptyAble(objects).peeks(strings -> System.out.println("strings.size() = " + strings.size()));



        /*
        其他东西
         */
        System.out.println("\n\n\n其他东西===========================");
        int num1 = 100;
        int num2 = 11;
        System.out.println("Opt.ofTry(() -> num1 + num2) = " + Opt.ofTry(() -> num1 + num2));
    }

三、运行结果：

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为空的情况==================================
Opt.empty() = null
Opt.of(objects) = []
Opt.ofNullable(objects) = []
Opt.ofBlankAble(objects) = []
Opt.ofEmptyAble(objects) = null
objects.isEmpty() = true
传入的值不存在呢
Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 10) = null



不为空的情况==================================
Opt.of(objects) = [张三, 李四, 王五, 赵六, null,  ]
Opt.ofNullable(objects) = [张三, 李四, 王五, 赵六, null,  ]
Opt.ofBlankAble(objects) = [张三, 李四, 王五, 赵六, null,  ]
Opt.ofEmptyAble(objects) = [张三, 李四, 王五, 赵六, null,  ]
Opt.ofEmptyAble(objects).get() = [张三, 李四, 王五, 赵六, null,  ]
objects.isEmpty() = false
strings = [张三, 李四, 王五, 赵六, null,  ]
[张三, 李四, 王五, 赵六, null,  ]
Opt.ofEmptyAble(objects).filter(strings -> strings.size() > 10) = [张三, 李四, 王五, 赵六, null,  ]
[张三, 李四, 王五, 赵六, null,  ]
strings.size() = 6



其他东西===========================
Opt.ofTry(() -> num1 + num2) = 111