**在 ArrayList 的中间或开头插入元素,**当我们向 ArrayList 的中间或开头插入元素时,需要将插入位置之后的所有元素都向后移动一位,以腾出空间给新元素。因此,该操作的时间复杂度是 O(n)。 插入的时候,如果底层数组大小不够,就会发生扩容:构造ArrayList的时候,默认的底层数组大小是10,不够的话就动态扩容,扩容的...
Stream(5.0 版新增):消息队列,相比于基于 List 类型实现的消息队列,有这两个特有的特性:自动生成全局唯一消息ID,支持以消费组形式消费数据。# 热key 是什么?怎么解决?Redis热key是指被频繁访问的key,可能会导致单个key的访问量过大,影响系统性能。解决方法包括:开启...
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kill -9 <PID> 使用kill命令结合ps和grep命令查找线程ID:如果你只知道线程的名称或某些特征,可以使用ps和grep命令来查找线程ID,然后使用kill命令终止线程。 ps -eLf | grep <thread_name_or_feature> | grep -v grep | awk '{print $2}' | xargs kill -9 ...
Java Examples Java’s Executor framework, java.util.concurrent package, and synchronized keyword facilitate concurrency. Java’s ForkJoinPool, the Stream API’s parallel() method, and Parallel Streams enable parallelism.Java Interview Questions and Answers Ques 41: Write code Check if the given str...
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Java Interview Questions Part 7 What are the functions of the JDBC Connection interface? TheConnection interfacemaintains a session with the database. It can be used for transaction management. It provides factory methods that return the instance of Statement, PreparedStatement, CallableStatement, and ...
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Java Collections Interview Questions and AnswersWhat are Collection related features in Java 8? Java 8 has brought major changes in the Collection API. Some of the changes are: Java Stream API for collection classes for supporting sequential as well as parallel processing Iterable interface is ...
Before coding the solution, interview candidates are expected to ask some follow-up questions. In particular:Should a run be encoded even if it makes the resulting string longer? Should a run be encoded even if it doesn’t make the resulting string shorter? (This can be answered from the ...