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1.ArrayList集合和数组的优势对比：长度可变添加数据的时候不需要考虑索引，默认将数据添加到末尾1.1 ArrayList类概述什么是集合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ArrayList集合的特点长度可以变化，只能存储引用数据类型。泛型的使用用于约束集合中存储元素的...

java集合练习

import java.util.ArrayList; import java.util.List; public class Bank{ private List<Customer> customers; //customers集合 private int ...

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