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28 通过无符号转换转换数字这个问题要求我们通过无符号转换将给定的有符号的int转换成long。那么，让我们考虑签名的Integer.MIN_VALUE，即 -2147483648。在 JDK8 中，使用Integer.toUnsignedLong()方法，转换如下（结果为 2147483648）：...

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11 检查字符串是否为回文作为一个快速的提醒，回文（无论是字符串还是数字）在反转时看起来是不变的。这意味着可以从两个方向处理（读取）回文，并且将获得相同的结果（例如，单词madam是回文，而单词madam不是）。一个易于实现的解决方案是用中间相遇的方法比较给...

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5 元音和辅音计数以下代码适用于英语，但取决于您所涵盖的语言种类，元音和辅音的数量可能会有所不同，因此应相应调整代码。此问题的第一个解决方案需要遍历字符串并执行以下操作：我们需要检查当前字符是否是元音（这很方便，因为英语中只有五个纯元音；其他语言有更多元音，但数量仍然很小...

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