Java ArrayList add(int index, E element)和set(int index, E element)两个方法的说明 一般使用List集合,估计都是使用这个ArrayList,一般呢也就是简单遍历数据和存储数据。 很少使用到add(int index, E element)和set(int index, E element)两个方法。 这两个方法,乍一看,就是在指定的位置插入一条数据。 区...
Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 1, Size: 0 at java.util.ArrayList.rangeCheckForAdd(ArrayList.java:665) at java.util.ArrayList.add(ArrayList.java:477) 我的本意是先new一个大小为5的List,然后在第一个位置添加一个元素,查看文档发现add是在指定位置添加元素然后...
填空题7.1 在Java中,创建一个ArrayList的语句是:List list = new ArrayList();7.2 在Java中,遍历ArrayList的语句是:for (元素���型 element : list)7.3 在Java中,将元素添加到HashSet的语句是:set.add(element);7.4 在Java中,获取HashMap的键集的语句是:map.keySet();7.5 在Java中,检查集合是否...
将此集合中指定索引位置的元素修改为 element 参数指定的对象。 此方法返回此集合中指定索引位置的原元素...
publicE set(intindex, E element) Example In the following code shows how to use ArrayList.set(int index, E element) method. importjava.util.ArrayList;//fromwww.java2s.compublicclassMain {publicstaticvoidmain(String[] args) { ArrayList<Integer> arrlist =newArrayList<Integer> (5); ...
// Create an ArrayList to contain// the property items of the configuration// section.ArrayList configPropertyAL =newArrayList(lockedAttribList.Count);foreach(PropertyInformation propertyIteminconfigSection.ElementInformation.Properties) { configPropertyAL.Add(propertyItem.Name.ToString()); }// Copy ...
Index of an element of a java.util.Set can be found by converting it to an a java.util.List: package com.logicbig.example;import java.util.ArrayList;import java.util.HashSet;import java.util.Set;public class SetIndexExample { public static void main(String[] args) { Set<Integer> my...
<>();// use add() method to add elements in the arrayListarrayList.add("Welcome");arrayList.add("To");arrayList.add("Tutorialspoint");// insert an element at index 2arrayList.set(2,"World Of");// let us print the 3rd elementSystem.out.println("3rd Element = "+arrayList.get(2))...
Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests an element for membership in a set. This structure is often used to ensure that no duplicates are present in a container. Implements Container interface. type Set interface { Add(...
Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests an element for membership in a set. This structure is often used to ensure that no duplicates are present in a container. Implements Container interface. type Set interface { Add(...