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        String str = null;
        Assert.notNull(str, "str为空");

        String str1 = "abc";
        Assert.isNull(str1, "str不为空");

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        boolean f = false;
        Assert.isTrue(f, "f为false");

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        ArrayList list = null;
        Assert.notEmpty(list, "list为空");

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        Object[] ar = new Object[1];
        Assert.noNullElements(ar,"数组为空");

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public class AlternativeJdkIdGeneratorDemo {
    public static void main(String[] args) {
        AlternativeJdkIdGenerator alternativeJdkIdGenerator = new AlternativeJdkIdGenerator();
        UUID uuid = alternativeJdkIdGenerator.generateId();
        System.out.println(uuid);
        System.out.println(UUID.randomUUID().toString());
    }
}

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5c3da762-4b29-7bd7-a625-2840b4cde935
b56ebdfa-2369-4354-9fff-b121579c2d2a

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public class Base64UtilsDemo {
    public static void main(String[] args) {
        byte[] bytes = new byte[10];
        byte[] encode = Base64Utils.encode(bytes);
        byte[] decode = Base64Utils.decode(bytes);
    }
}