get the index of an element in a list java ?

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https://www.delftstack.com › howto › java › find-the-index-of-an-element-in-a-list-using-java

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Find the Index of an Element in a List Using Java | Delft Stack
11 sept. 2022Method 1: Use the indexOf () Method to Find Index Method 2: Use the Stream API to Find Index Method 3: Use Loop to Find Index When working with lists, you may need to find the index of a specific element because, in some cases, finding the index becomes significant.

https://stackoverflow.com › questions › 16393709 › getting-index-of-an-item-in-an-arraylist

https://stackoverflow.com › questions › 16393709 › getting-index-of-an-item-in-an-arraylist
java – Getting Index of an item in an arraylist; – Stack Overflow
Basically you need to look up ArrayList element based on name getName. Two approaches to this problem: 1- Don’t use ArrayList, Use HashMap where String would be name. 2- Use getName to generate index and use index based addition into array list list.add (int index, E element).

https://www.javatpoint.com › java-list-indexof-method

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Java List indexOf() Method with Examples – Javatpoint
The indexOf () method of List interface returns the index of the first occurrence of the specified element in this list. It returns -1 if the specified element is not present in this list. Syntax public int indexOf (Object o) Parameters The parameter ‘o’ represents the element to be searched. Throws:

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Trouver l’index d’un élément dans List en Java
Cet article explique comment trouver l’index d’un élément dans une liste en Java. 1. Utilisation indexOf () méthode La solution standard pour trouver l’index d’un élément dans une liste est d’utiliser le indexOf () méthode. Elle renvoie l’index de la première occurrence de l’élément spécifié dans la liste, ou -1 si l’élément n’est pas trouvé. 1 2 3

https://stackoverflow.com › questions › 65277747 › how-do-i-find-the-element-at-an-index-position-in-java

https://stackoverflow.com › questions › 65277747 › how-do-i-find-the-element-at-an-index-position-in-java
How do I find the element at an index position in Java?
In the case of array you can get the element at position ‘index’ as follows: int index = 0; String value = array [index]; If it is an ArrayList, you can get the element at position ‘index’ as follows: int index = 0; String value = arryList.get (index); Share Improve this answer Follow edited Dec 13, 2020 at 20:04 answered Dec 13, 2020 at 16:19

https://stackoverflow.com › questions › 47622723 › find-all-indexes-of-a-value-in-a-list

https://stackoverflow.com › questions › 47622723 › find-all-indexes-of-a-value-in-a-list
java – Find all indexes of a value in a List – Stack Overflow
You could go over the entire list and save all the indexes that match the search term. Java 8’s steams give you a pretty elegant way of doing this: int [] indexes = IntStream.range (0, names.size ()) .filter (i -> names.get (i).equals (search)) .toArray (); Share Follow edited Feb 9, 2021 at 18:24 M. Justin 12.7k 7 84 117

https://www.tutorialspoint.com › How-to-find-the-index-of-given-element-of-a-Java-List

https://www.tutorialspoint.com › How-to-find-the-index-of-given-element-of-a-Java-List
How to find the index of given element of a Java List? – tutorialspoint.com
Java 8 Object Oriented Programming Programming The indexOf (Object) method of the java.util.ArrayList class returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. Using this method, you can find the index of a given element. Example Live Demo

https://stackoverflow.com › questions › 9008532 › how-to-find-index-position-of-an-element-in-a-list-when-contains-returns-true

https://stackoverflow.com › questions › 9008532 › how-to-find-index-position-of-an-element-in-a-list-when-contains-returns-true
java – How to find index position of an element in a list when contains …
In case it does, I want to fetch that element from the list, so How do I find out index position of where the element is? List benefit = new ArrayList(); HashMap map = new HashMap(); map.put(one, 1); benefit.add(map); HashMap map4 = new HashMap(); map4.put(one, 1); System.out.println(size: + benefit.size()); System.out …

https://www.baeldung.com › find-list-element-java

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How to Find an Element in a List with Java | Baeldung
To find an element matching specific criteria in a given list, we: invoke stream () on the list. call the filter () method with a proper Predicate. call the findAny () construct, which returns the first element that matches the filter predicate wrapped in an Optional if such an element exists.

https://stackoverflow.com › questions › 8439037 › better-way-to-find-index-of-item-in-arraylist

https://stackoverflow.com › questions › 8439037 › better-way-to-find-index-of-item-in-arraylist
java – Better way to find index of item in ArrayList? – Stack Overflow
Java API specifies two methods you could use: indexOf(Object obj) and lastIndexOf(Object obj). The first one returns the index of the element if found, -1 otherwise. The second one returns the last index, that would be like searching the list backwards.

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