If you’re interviewing for a Java programming role, then your coding skills will probably be tested. Whether you’re a beginner in Java or an expert programmer, this article provides some common Java interview questions and answers to help you prepare. 1. How do you reverse a string in Ja...
使用Stream API的做法:List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); int sum = numbers.stream() .mapToInt(Integer::intValue) .sum(); 通过Stream API,我们可以先使用.mapToInt()将Integer流转换为IntStream(这是为了高效处理基本类型),然后直接调用.sum()方法来计算总和,极大地简化了...
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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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 ...
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 ...
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 ...
public class ArrayList<E> extends AbstractList<E> implements List<E>, RandomAccess, Cloneable, java.io.Serializable { /** * 列表元素集合数组如果新建ArrayList对象时没有指定大小,那么会将 * EMPTY_ELEMENTDATA赋值给elementData, * 并在第一次添加元素时,将列表容量设置为DEFAULT_CAPACITY */ transient ...
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