I have an ArrayList of Strings, and I want to remove repeated strings from it. How can I do this?
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How could I go about detecting (returning true/false) whether an ArrayList contains more than one of the same element in Java?
Many thanks,
Terry
Edit
Forgot to mention that I am not looking to compare ... |
I have a code to return an arrayList with the duplicates of an ArrayList
but seems it's not working, I am comparing all items in the array...
public ArrayList<ObjectList> duplicates(ArrayList<ObjectList> someObjectsList) {
...
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Okay at first I thought this would be pretty straightforward. But I can't think of an efficient way to solve this. I figured a brute force way to solve this but ... |
I have an ArrayList<Integer> that is full of years that it pulls from my database i want to know how it is possible to loop through them so i can remove ...
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i have one arraylist say "templist" it will have items of item say "Stool"
now list contains duplicates
1 abc wwww.com lob1
1 abc wwww.com lob2
now i ... |
I'm making a game for a class and one element of the game is displaying a number of cabbages, which are stored in an ArrayList. This ArrayList must be a fixed ... |
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I am performing some maintenance tasks on an old system. I have an arraylist that contains
following values:
a,b,12
c,d,3
b,a,12
d,e,3
a,b,12
I used following code to remove duplicate values from arraylist
ArrayList<String> arList;
public static void ...
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I am looking for an object like ArrayList that would let me avoid duplicate entries.
For example it might have a method that calls 'contains()' to valid each entry before it is ... |
First of all, I would like to say that I have searched for an answer to this, but did not get an suitable solution. So I have decided to post it ... |
Sorry of the title is a little bit confusing. What I need to do is read a text file with a bunch of cities and states on separate lines like this:
Salem, ...
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Hi i have arraylist of custom object , i want to remove duplicate entries ,in my case duplication as follows
the object have three field title ,subtitle ,id if ... |
I have an ArrayList which contains duplicate values at diff diff index.
for example {"Indian","American","Chinese","Australian","Indian","Russian","Indian"}
as u can see the value - "Indian" exists at index - 0, 4 & 6.
I need to ... |
I am having an option in my website for the user i.e: "Settings" in that I given 3 options(TextBoxes) to enter details: 1.E-mail, 2.SMS, 3.MMS.. in this user can enter another ... |
I was wondering if there was a way to find duplicate elements in an arraylist. For more context of what I'm trying to do, I have an arraylist of strings. The ... |
I am trying to remove duplicate objects from an arraylist
see code below:
ArrayList<Customer> customers=new ArrayList<Customer>();
for(int i=0;i<accounts.size();i++){
customers.add(accounts.get(i).getCustomer());
...
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This is a pretty common question, but I could not find this part:
Say I have this array list:
List<MyDataClass> arrayList = new List<MyDataClass>;
MyDataClass{
String name;
String age;
}
Now, I ... |
I have an ArrayList<Car>
For Example
class Car{
String carName;
int carType;
}
Now, I have to find if the list has any cars having same name. What is the ... |
sorry if i confusing, i have two arraylist as below
al1 - [Consignment, Bank, Custodian, Rejected, Bank]
al2 - [[2, 0, 0, 0, 0, 0, 0],
[6, ...
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I've copied an ArrayList over as so:
MyList2 = MyList1;
In an attempt to load MyList2's objects with the ones which MyList1 has.
Now as I iterate through MyList2, I it.remove() some objects, but ... |
I am stuck On how to find duplicates in an ArrayList and then manipulate them. I am implementing a polynomial class and I want to add monomials of the same ... |
The way you show us here most likely does not work because you have not added hashCode() and equals() methods to your class MyClass. You must add these methods so that HashSet can properly detect when two MyClass objects are equal. See the description of the methods hashCode() and equals() in the API documentation of class java.lang.Object for details on how ... |
Hi Ranchers, Can you please help me with this problem. I have a master arraylist say A1 which hase values like Red, Blue, Green I have to copy unique/non duplicate values from another arraylist say A2 to A1. Whenever there is a duplicate value in A2 which corresponds to A1 the value should be stored in another arraylist A3. This is ... |
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Hi, I have a class called Switch which has as a constructor parameter an integer. In another class called Network, in a method I create 2 instances of Switch, a and b. I am adding the 2 objects to an arraylist of type Switch called switchList. How can I compare the integer values of the objects so I can find duplicates ... |
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Hi All, How to avoid duplicate element/Values in ArrayList?This was interview question. My Answer was better to use Set in place of ArrayList.When collection framework has such facility better to use that to avoid duplicate elements. But interviewer was said no i want it only in ArrayList.I suggest to use equals and override it with hashcode and make some sort of ... |
import java.util.*; public class ArrayListRemoveDuplicates { public static void main(String args[]) { ArrayList al1=new ArrayList(); al1.add("raja"); al1.add("raja"); al1.add("tendulkar"); al1.add("prakash"); al1.add("sachin"); al1.add("sachin"); al1.add("zaheer"); al1.add("asin"); al1.add("surya"); Set set = new HashSet(); set.addAll(al1); System.out.println("Arraylist " + al1); System.out.println("Set " + set); } } Output : Arraylist [asin, prakash, raja, raja, sachin, sachin, surya, tendulkar, zaheer] Set [surya, zaheer, sachin, asin, tendulkar, raja, prakash] |
Hi All I need to find duplicate values in ArrayList is there any method to find duplicate values..? Example List list = new ArrayList(); list.add("a"); list.add("a"); list.add("b"); list.add("c"); list.add("c"); Here a and c are duplicate values. i need the output as [a,c] I already done using set but i need Any API to solve *i need not use any iteration logic ... |
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import java.util.Scanner; import java.util.ArrayList; public class MainClass { public static void main(String args[]) { ArrayList list = new ArrayList(); Scanner in = new Scanner(System.in); int input=0; while(true) { input = in.nextInt(); if(input<=0) { System.out.println("Exit"); break; } else list.add(input); } for(int i=0; i |
Hi all, I have an arraylist with the items listed below. ArrayList result = new ArrayList(); UserID Name rightRole 1. { 123, george , Y} 2. { 123 , grorge , N} 3. { 456, chris, Y} Now i want to identify those users with duplicate entires in the list (Eg. George) and keep only one item with Right Role 'Y' ... |
How can I find the duplicates in an arraylist by using the contains method? then I need to store every duplicate in another arraylist so lets say my arraylist is <1,2,2,3,3,2,1,3,4,5> so I need to find the duplicates which are 1,2 and 3 and store those duplicates in another arraylist so this arraylist will be something like this <1,2,3> and I ... |
Hi, I have an arraylist of beans from which I need to remove the duplicate entries. To elaborate, My bean has three field, name,age and indicator. At Present the arraylist contains duplicate entries. I want to get a final list in such a way that, the names are distince.If there are two beans with the same name, I want the bean ... |
Hi, I am sorry for asking a simple question. I have an ArrayList which contains Location objects. Location is a bean class with LocationId, Name, Address etc.. Now I want to remove duplicates from this ArrayList. We know whether duplicates exist or not by checking LocationId of Location object. LocationId is int. How can I remove duplicates from this ArrayList? I ... |
The problem is that equals() and hashCode() aren't implemented for your arrays. When it autoboxes your arrays to Double[], those methods default to Object's implementation of equals() and hashCode(), which does instance comparison instead of value comparison. I recommend wrapping your double arrays into a custom class that overrides equals() and hashCode() based on the values in the array and not ... |
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Alright I'm stuck here, I'm trying to add integers to an ArrayList without getting duplicates. I am aware of the boxing and auto unboxing of the int to Integer type. This is the code I have but I get a memory error when i try to run it. numberlist is an Array List declared earlier by ArrayList public void addLineNumber(int lineNumber){ ... |
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System.out.println(arList); Object arListArray[] = arList.toArray(); int arrSize = arListArray.length; for(int i = 0; i < arrSize; i++) { for(int j = 0; j < arrSize; j++) { if(i == j) { continue; } else { if (arListArray == arListArray[j]) { for (int k = j; k < arrSize - 1; k++) arListArray[k] = arListArray[k + 1]; arrSize--; } } } } ... |