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It’s relatively common for a try block to be followed by several catch blocks to handle various types of exceptions. If the bodies of several catch bl... 阅读全文
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java.util.Random 产生确定的值可能被恶意的程序预测到。java.security.SecureRandom 产生不确定的随机数不能被预测到。所以优先使用java.security.SecureRandom类。 阅读全文
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