ArrayList使用示例

本教程演示如何在ArrayList上执行各种操作，一些常见的操作如下：

• 将元素添加到ArrayList中。
• 从ArrayList中删除元素。
• 从ArrayList中检索元素。
• 打印ArrayList的大小。
• 检查ArrayList中是否存在元素。
• 查找ArrayList中元素的索引。
• 从ArrayList中删除所有元素。

文件：ArrayListExample.java –

package com.yiibai.tutorial;  import java.util.ArrayList; import java.util.List;  public class ArrayListExample {     public static void main(String[] args) {         List<String> list=new ArrayList<>();          /*Adding elements into the list*/         list.add("One");         list.add("Two");         list.add("Three");         list.add("Four");         list.add("Five");         System.out.println("Elements in list:"+list);          /*Removing an element from the list*/         String removedEle=list.remove(0); // Remove the first element         System.out.println("Element revoved:"+removedEle);         System.out.println("Elements in list after removal:"+list);          /*Retrieving an element in the list*/         String element=list.get(1);    // Get second element         System.out.println("Element at second position:"+element);          /*Print size of List*/         System.out.println("Number of elements:"+list.size());          /*Check if an element exist in the list*/         System.out.println("Element exist:"+list.contains("Five"));          /*Finding the index of an element*/         System.out.println("Index of 'Four' is :"+list.indexOf("Four"));          /*Removing all elements from the list*/         list.clear();         System.out.println("Elements in list:"+list);     } } 

执行上面示例代码，得到以下结果 –

Elements in list:[One Two Three Four Five] Element revoved:One Elements in list after removal:[Two Three Four Five] Element at second position:Three Number of elements:4 Element exist:true Index of 'Four' is :2 Elements in list after clear:[]