indexOf(13) // returns -1 numbers.indexOf(50) 在这里,indexOf()方法成功返回元素的位置13.然而,元素50数组列表中不存在。因此,该方法返回-1. 示例2:获取元素第一次出现的位置 import java.util.ArrayList; class Main { public static void main(String[] args) { // create an ArrayList ArrayList<...
public virtual int IndexOf (object? value, int startIndex); Parameters value Object The Object to locate in the ArrayList. The value can be null. startIndex Int32 The zero-based starting index of the search. 0 (zero) is valid in an empty list. Returns Int32 The zero-based in...
Example 1: Get the Index of ArrayList Element importjava.util.ArrayList;classMain{publicstaticvoidmain(String[] args){// create an ArrayListArrayList<Integer> numbers =newArrayList<>();// insert element to the arraylistnumbers.add(22); numbers.add(13); numbers.add(35); System.out.println("N...
ArrayListfib=newArrayList(); fib.add(18); fib.add(23); fib.add(37); fib.add(45); fib.add(50); fib.add(67); fib.add(38); fib.add(88); fib.add(91); fib.add(10); What if I want to reference a specific index of the array. I don't want what's in the index....
importjava.util.ArrayList;publicclassIndexOfExample{publicstaticvoidmain(String[]args){ArrayList<String>al=newArrayList<String>();al.add("AB");al.add("CD");al.add("EF");al.add("GH");al.add("IJ");al.add("KL");al.add("MN");System.out.println("Index of 'AB': "+al.indexOf("...
In this program, there are 5 elements "100", "200", "300", "400" and "500" and we are getting the index of "300"import java.util.ArrayList; public class SearchAnElement { public static void main(String[] args) { //ArrayList object ArrayList arrList = new ArrayList(); //adding ...
Learn to get the index of the first occurrence of an element in an arraylist in Java using ArrayList.indexOf() method with a simple example.
开发者ID:tranleduy2000,项目名称:javaide,代码行数:47,代码来源:SearchAnElementInArrayListExample.java 示例3: replaceInQueue importjava.util.ArrayList;//导入方法依赖的package包/类privatevoidreplaceInQueue(ArrayList<Element> queue, Element out, Element in){inti = queue.lastIndexOf(out); ...
How to find an index of the ArrayList from the starting index in Java? I want to search for an index of the element in the ArrayList but I want to start searching from starting index different than 0. I tried like this: import java.util.*; public class Test{ public ... ...
In the above code fence, we first take a list namedMyValand also take an item which index we are going to find. Then we passed it toIntStreamto filter the elements and find the index of the element that we provided. We get the index if the item is in theMyVallist; otherwise, we...