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ArrayList集合
2022-07-06 09:25:00 【手可摘鑫晨】
1.ArrayList集合的基本方法
导包:java.util;
ArrayList<数据类型> 变量名名 = new ArrayList <数据类型> ();
注意:数据类型必须是引用数据类型
2.ArrayList集合的常用方法
boolean add(E e) 添加指定元素至集合末尾,返回元素是否添加成功。
void add(int index,E e) 在指定位置添加元素。
E get(int index) 返回索引值为index的元素。
E set(int index , E e) 修改指定索引值元素,返回修改后元素。
boolean remove(Object o) 删除指定元素,返回删除是否成功。
E remove(int index) 删除指定位置元素,返回被删除的元素。
int size() 返回集合元素的个数。
int indexOf(Object obj) 返回元素第一次出现的索引值位置。
int lastlndexOf(Object obj) 返回元素最后一次出现的索引值位置。
boolean contains(Object obj) 判断是否包含该元素。
3.ArrayList储存基本数据类型
基本类型 包装类型
int Integer
char Character
byte Byte
short Short
long Long
float Float
double Double
boolean Boolean
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