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public class User{ //All final attributes private final String firstName; // required private final String lastName; // required private f... 阅读全文
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object MergeSort { def msort[T](less: (T, T) => Boolean)(xs: List[T]): List[T] = { def merge(xs: List[T], ys: List[T]): List[T] = { (xs, ys) ... 阅读全文
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Q1. Name the most common InputFormats defined in Hadoop? Which one is default?Following 2 are most common InputFormats defined in Hadoop- TextInputFor... 阅读全文
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ConcurrentHashMap通常只被看做并发效率更高的Map，用来替换其他线程安全的Map容器，比如Hashtable和Collections.synchronizedMap。实际上，线程安全的容器，特别是Map，应用场景没有想象中的多，很多情况下一个业务会涉及容器的多个操作，即复合操作，并发... 阅读全文
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Loan Pattern as the name suggests would loan a resource to your function. So if you break out the sentence. It wouldCreate a resource which you can us... 阅读全文