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Java基础 | 集合（六）

（六）Collections工具类1.Collections概述和使用Collections类的概述是针对集合操作的工具类Collections类的常用方法代码演示：import java.util.ArrayList; import java.util.Collections; import ja...

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Java基础 | 集合（五）

（五）Map集合1.Map集合概述和使用Map集合概述interface Map<K,V> K：键的类型; V：值的类型将键映射到值的对象；不能包含重复的键；每个键可以映射到最多一个值举例：学生的学号和姓名创建Map集合的对象多态的方式具体的实现类HashMap代码演示：import j...

Java基础 | 集合（四）

（四）Set集合1.Set集合概述和特点Set集合特点不包含重复元素的集合没有带索引的方法，所以不能使用普通for循环Set集合练习存储字符串并遍历import java.util.HashSet; import java.util.Set; public class SetDemo { publi...

Java基础 | 集合（三）

（三）List集合1.List集合概述和特点有序集合（也称为序列），用户可以精确控制列表中每个元素的插入位置。用户可以通过整数索引访问元素，并搜索列表中的元素与Set集合不同，列表通常允许重复的元素List集合特点有序：存储和取出的元素顺序一致可重复：存储的元素可以重复代码演示：public cla...

Java基础 | 集合（二）

（二）Collection1.集合类体系结构2.Collection集合概述和使用Collection集合概述是单例集合的顶层接口，他表示一组对象，这些对象也称为Collection的元素JDK不提供此接口的任何直接实现，它提供更具体的子接口（如set和List）实现创建Collection集合的对...

Java基础 | 集合（一）

集合（一）集合基础1.集合概述集合类的特点：提供一种存储空间可变的存储模型，存储的数据容量可以发生改变集合类有很多种，ArrayList是其中的一种ArrayList：可调整大小的数组实现：是一种特殊的数据类型，泛型如何用？在出现E的地方使用引用数据类型替换即可举例：ArrayList,ArrayL...

Java基础差缺补漏系列之集合系列3

Map接口无序，唯一HashMap特点：无序。唯一，特点是按照key进行总结的，因为底层key寻找哈希表的结构（数组+链表）哈希表原理：如放入这个集合数据的对应的类，必须重写HashCode和equals这两个方法，否则结果就不符合唯一，无序的特点...

Java基础差缺补漏系列之集合系列2

linkedlist底层为链表LinkedList 常用方法：增加：addFirst(E e),addLast(E e),offer(E e),offerFirst(E e),offerLast(E e)删除：poll(),pollFirst(),pollLast(),removeFirst(),r...

Java基础差缺补漏系列之集合系列1

集合什么是算法和数据结构算法：可以解决具体问题。例如：1+2+3+4+5.。。+99+100流程=算法有设计解决的具体的流程算法1:（1+100）× 50= 101 × 50–>高斯算法有评价这个算法的具体指标有评价这个算法的具体的指标–>时间复杂度...

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