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Java集合容器面试题5

知识充电站TreeMap<K,V>的Key值是要求实现java.lang.Comparable，所以迭代的时候TreeMap默认是按照Key值升序排序的；TreeMap的实现是基于红黑树结构。适用于按自然顺序或自定义顺序遍历键（key）。HashMap<K,V>的Key值实现...

Java集合容器面试题4

HashMap的put方法的具体流程？putVal方法执行流程图①.判断数组table是否为空或length=0，是的话就执行resize()进行扩容；②.根据键值key计算hash值得到插入的数组索引i，如果table[i]==null，直接新建节点添加，转向⑥，如果tab...

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Java集合容器面试题3

插入数据时，ArrayList、LinkedList、Vector谁速度较快？在插入数据时，LinkedList 的速度相对较快，因为它的底层是一个链表结构，插入一个元素只需要修改相邻节点的指针即可，时间复杂度为 O(1)。而 ArrayList 和 Vector 的底层是一个数组结构，插入一个元素...

Java集合容器面试题2

各自的优劣用Comparable 简单，只要实现Comparable 接口的对象直接就成为一个可以比较的对象，但是需要修改源代码。用Comparator 的好处是不需要修改源代码，而是另外实现一个比较器，当某个自定义的对象需要作比较的时候，把比较器和对象一起传递过去就可以比大小了，并且在Co...

Java集合容器面试题1

集合什么是集合集合就是用于存储数据的容器，只能存储引用类型，所以集合非常适合用来存储对象。而且集合是长度可变，所以对象个数不确定的时候适合使用集合集合的特点1、集合只能存储引用数据类型。集合用于存储对象。2、对象的个数确定可以使用数组，对象的个数不确定的可以用集合。因为集合是可变长度的。集合和数组的...

Java集合容器面试题

1 集合容器概述1.1 什么是集合集合框架：用于存储数据的容器。集合框架是为表示和操作集合而规定的一种统一的标准的体系结构。任何集合框架都包含三大块内容：对外的接口、接口的实现和对集合运算的算法。接口：表示集合的抽象数据类型。接口允许我们操作集合时不必关注具体实现，从而达到“多态”。在面向对象编程语...

2021新版Java集合容器面试题

　　集合容器概述　　什么是集合　　集合的特点　　集合和数组的区别　　使用集合框架的好处　　常用的集合类有哪些？　　List，Set，Map三者的区别？List、Set、Map 是否继承自 Collection 接口？List、Map、Set 三个接口存取元素时，各有什么特点？　　集合框架底层数据结构...

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