ArrayList<String>places=newArrayList<String>(Arrays.asList("a","b","c","d","e","f"));StringfirstElement=list.get(0);//aStringsixthElement=list.get(5);//f 1. ArrayListget()Method TheArrayList.get(int index)method returns the element at the specified position'index'in the list. 1.1...
index– the index position of the element if the element is found. -1– if the element is NOT found. 2.ArrayList.indexOf()Example The following Java program gets the first index of an object in the arraylist. In this example, we are looking for the first occurrence of the string “ale...
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. Syntax: List.get(index); Program: importjava.util.*;publicclassListExample{publicstaticvoidmain(String[]args){// creating a list of integersList...
public class test {public static void main(String[] args) {ArrayList<Integer> a = new ArrayList...
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...
System.out.println("the element at index 2 is "+ element); } } 输出: Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 5, Size: 4 at java.util.ArrayList.rangeCheck(ArrayList.java:657) at java.util.ArrayList.get(ArrayList.java:433) ...
关于ArrayList初始化时,初始容量的问题 这里写自定义目录标题 首先来看ArrayList的构造方法有哪些 一、ArrayList的构造方法 无参构造 传入指定参数 这个暂时不用管 在ArrayList中有一个elementDate的数组,ArrayList底层就是用Object数组来实现的 这里还定义了一个空数组,在ArrayList使用无参构造方法时使用 回到问题,如果...
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index of the element to return Returns Object the element at the specified position in this list Implements Get(Int32) Attributes RegisterAttribute Remarks Returns the element at the specified position in this list. Java documentation forjava.util.ArrayList.get(int). ...
>)c).getArray();else{es=c.toArray();if(c.getClass()!=java.util.ArrayList.class)es=Arrays.copyOf(es,es.length,Object[].class);}setArray(es);}// 传入一个数组,数组元素提取后赋值到 CopyOnWriteArrayList 数组publicCopyOnWriteArrayList(E[]toCopyIn){setArray(Arrays.copyOf(toCopyIn,toCopyIn....