logo
down
shadow

Remove random item from ArrayList


Remove random item from ArrayList

Content Index :

Remove random item from ArrayList
Tag : java , By : Bruce
Date : November 29 2020, 09:01 AM

seems to work fine First, keep the rando value. then use it when you're starting the next activity like this:
myArrayList.remove(rando);

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Retrieving a random item from ArrayList


Tag : java , By : John Phipps
Date : March 29 2020, 07:55 AM
This might help you anyItem is a method and the System.out.println call is after your return statement so that won't compile anyway since it is unreachable.
Might want to re-write it like:
import java.util.ArrayList;
import java.util.Random;

public class Catalogue
{
    private Random randomGenerator;
    private ArrayList<Item> catalogue;

    public Catalogue()
    { 
        catalogue = new ArrayList<Item>();
        randomGenerator = new Random();
    }

    public Item anyItem()
    {
        int index = randomGenerator.nextInt(catalogue.size());
        Item item = catalogue.get(index);
        System.out.println("Managers choice this week" + item + "our recommendation to you");
        return item;
    }
}

Search through arraylist, remove item from arraylist, add it elsewhere


Tag : java , By : Alan Little
Date : March 29 2020, 07:55 AM
I wish this help you Your problem is that you are not allowed to edit the array while you are iterating through it. Change your for loop like this to get rid of the error. Also you are using the if loop wronly. Don't ask the complete condition to be false but only the one you want to be false with writing an ! before it.
public void drop(String name)
{      
    for (int i = 0; i < myArray.size(); i++) {
        Item count = myArray.get(i);
        if (count.getName().contains(name) && !currentRoom.hasItem()){
            currentRoom.addItem(count);
            currentMessage = "you have successfully dropped the item in the room";
            myArray.remove(count);
            i--; // element removed, so decrease count
        }
        else if(count.getName().contains(name) && currentRoom.hasItem() == true)
        {
            currentMessage = "the room already has an item";
        }
        else 
        {
            currentMessage = "you do not have that item";
        }
    }
}

Remove Random Item From ArrayList Causing ConcurrentModificationException


Tag : java , By : SpittingCAML
Date : March 29 2020, 07:55 AM
this one helps. When you modify subList you are also modifying groupList. So if you are iterating over groupList during this process you would get ConcurrentModificationExceptions.
It doesn't sound like you need to modify groupList (since what you are after is the filteredList). So try making subList it's own list rather than a view over groupList:
List<Group> subList = new ArrayList<>(groupList.subList(firstMatch, lastMatch));

Python:Is there any way to remove an item from a list (random) after it has been used? Or change results of random.choic


Tag : python , By : baylisscg
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I really didn't know how to ask this question, and I probably sound stupid. I've been looking around for solutions to the problem I have been having, but everything I've tried hasn't worked. I'm working on a project for my computer science class, as my final, that randomly generates an identity from a list of names, birthdays, cities, addresses, etc. (sidenote: my teacher hasn't actually taught me anything; we read notes and did quizzes that consisted of definitions from the notes, and when we can't figure something out he just tells us to ask our neighbor. And, this is my first post on here, so if the formatting is incorrect, and my coding skills suck, I apologize in advance.) Anyway, I'll get on with my question/problem. , You can remove a random item from a list with pop.
selection = random.choice(range(len(name_list)))
name = name_list.pop(selection)

How to remove item from ArrayList if condition in other ArrayList is true


Tag : java , By : warttack
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm happy that you fix your exception. Anyway, when I said about back iteration I meant something like that
Firstly, Some of check like
 if(fn.size()==fp.size()){
   // and after that go to delete. 
  for (int i=fn.size(); i>0;i--) { 
      if (fn.contains(s)) {
      fn.remove(i);
      fp.remove(i);
  } }}
Related Posts Related QUESTIONS :
  • How to configure java.util.logging via properties to use standard output?
  • How to iterate through array in order
  • Is there better way of iteration to find the evenly divisible number?
  • How do I avoid using if statements with a large amount of variables in java
  • Writing JUnit test cases for a Spring Boot Service Application with autowired components
  • Cors for GET with Postman not showing headers
  • Printing values in different column same row using APACHE POI
  • Fully decompile java6 web application
  • Passing keycloak configuration parameters in the code rather than reading from application.properties
  • setDataSource() IO exception
  • Unexpected Output while retrieving Data from mongodb and displaying in a csv file?
  • Algorithm for searching a value in two arrays
  • How to avoid casting with generic return values?
  • Java/RegEx - Negation of pattern not working
  • How to split a string to non empty words if it might include a separator like tab on first place
  • Supplier<Sequence<String>> cannot be iterated more than once
  • Why there is only one thread can actually started in @PostConstruct method?
  • Manage CompletionStage inside of Netty handler
  • Url Problem while Developing on Localhost and deploy on Remote Virtual Server
  • How to identify the missing type id in Jackson error?
  • android data binding error: cannot find symbol
  • Spring Boot application with a jar dependency does not run after maven build
  • Spring Data JPA query , filter ? search engine ? JPQL?
  • Why LiveData returns null in ViewModel?
  • what this line of code mean....new URLClassLoader(new URL[0],getClass().getClassLoader());
  • Why do need to use new Random() instead of just Random Randomnum?
  • I want to access zk components from the java file
  • How do I cast FieldValue.serverTimestamp() to Kotlin/Java Date Class
  • Insertion Sort Double Array with User Input - JAVA
  • Creating 2 dimesional array with user input and find sum of specific columns
  • can not get Advertising ID Provider in android
  • Convert list of Objects to map of properties
  • How to represent an undirected weighted graph in java
  • Return values as array from collection
  • ByteBuddy generic method return cast to concrete type
  • ImageView hides the round corners of the parent
  • Is there a way to find setter method by its getter method or vice versa in a class?
  • Get aggregated list of properties from list of Objects(Java 8)
  • Unable to find a document in Mongodb where exact date match in java
  • UsernamePasswordAuthenticationFilter skips success handler
  • Use Java filter on stream with in a stream filter
  • Default Login not successful in spring boot 2.1.7
  • Adding key value pairs from a file to a Hashmap
  • Rub regex: matching a char except when after by another char
  • Convert Base64 String to String Array
  • Escape Unicode Character 'POPCORN' to HTML Entity
  • An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
  • Mongo java driver cannot find public constructor for interface
  • How to unit test writing a file to AWS Lambda output stream?
  • How to make a GitHub GraphQL API Call from Java
  • What's the difference between @ComponentScan and @Bean in a context configuration?
  • Expected class or package adding a view using a class
  • can be delete of a element in a static array be O(1)?
  • Instance variable heap or stack ? ( with specific example)
  • Assert progress of ProgressBar in Espresso test
  • How to detect if gson.fromjson() has excess elements
  • I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
  • How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
  • Thrift types as a Generic
  • Effective algorithm to random 4 unique integers less than a big max such as 100_000
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com