importjava.util.ArrayList;importjava.util.List;publicclassFirstElementExample{publicstaticvoidmain(String[]args){// 创建一个包含整数的ArrayListList<Integer>numbers=newArrayList<>();numbers.add(1);numbers.add(2);numbers.add(3);// 获取列表的第一个元素intfirstElement=numbers.get(0);System.out.print...
In our example below, we will see how we can create a list element in Java. The code for our example will be something like the below, // Importing necessary packagesimportjava.util.ArrayList;importjava.util.Arrays;importjava.util.List;publicclassCollectionsDemo{publicstaticvoidmain(String[]args...
Last element of LinkedList is :500 以下是获取链表的第一个和最后一个元素的另一个示例 import java.util.LinkedList; public class Demo { public static void main(String[] args) { LinkedList lList = new LinkedList(); lList.add("1"); lList.add("2"); lList.add("3"); lList.add("4")...
Given a list of integers and we have to access/retrieve element/object from given index from the list in Java. Toget the element from given index- we useList.get()method, it is a library method of the List, which returns object/element from given index. ...
you need to use thesize()method and not length, which is used to get the length of the array. Earlier we have seenhow to get the first and last element from a linked listand In this tutorial, we are going to see an example of how to get the last element from ArrayList in Java....
Element element =root.element("node"); 1. 得到某节点下的所有子节点并进行遍历 List nodes = rootElm.elements("node"); for (Iterator it = nodes.iterator(); it.hasNext();) { Element element = (Element) it.next(); } 1. 2. 3. ...
In order to select a random index, you can use Random.nextInt(int bound) method: public void givenList_shouldReturnARandomElement() { List<Integer> givenList = Arrays.asList(1, 2, 3); Random rand = new Random(); int randomElement = givenList.get(rand.nextInt(givenList.size())); ...
Java Copy 输出: Theelements inListare:[Geeks,4,Geeks,8]Elementat1st index is:Geeks Java Copy 3. getLast() :该方法返回该列表中的最后一个元素。 声明: public E getLast() 返回值 : 该方法返回该列表中的最后一个元素 异常: NoSuchElementException :如果这个列表是空的 ...
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In Java 8, we can usereduceorskipto get the last element of a Stream. 1. Stream.reduce Java8Example1.java packagecom.mkyong;importjava.util.Arrays;importjava.util.List;publicclassJava8Example1{publicstaticvoidmain(String[] args){ List<String> list = Arrays.asList("node","java","c++",...