When you call remove(object o) on an arraylist in java, how does it compare the objects to find the correct one to remove? does it use the pointer? or does it ... |
I recall seeing, somewhere, an example that stepped through String args[] by deleting the lowest numbered value(s)
public static void main( String args[]) {
while (args.length > 0 ) ...
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I am new to java programming, been programing in php so I'm used to this type of loop:
int size = mapOverlays.size();
for(int n=1;n<size;n++)
{
mapOverlays.remove(n);
}
So I want to remove everything ... |
public void removeDuplicates (ArrayList<ArrayList<String>> strings) {
Set<ArrayList<String>> s = new LinkedHashSet<ArrayList<String>>(strings);
strings = new ArrayList<ArrayList<String>>(s);
}
i want to remove duplicated lines in ArrayList<ArrayList<String>>, I want ... |
I have an ArrayList, which includes a number of items I want to remove. I have the ids of the items to remove stored in another list. Figured the ... |
----What I'm doing----
So I have an assignment that takes an input of characters then calculates the capital gain for the string using a queue.
I'm stripping the input data then putting it ... |
I'm a relatively new Java programmer and I'm having difficuly removing more than one element from an ArrayList. Ideally I'd like to do something like this:
ArrayList ar1 = new ArrayList();
ar1.add(...)
ar1.add(...)
ar1.add(...)
ar1.add(...)
for ...
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Hi
I have written this code that with output you can get that .remove() method doesn't work. a, b, c, and d are some Points Objects that have x and y members.
Here ... |
Hi
I have written this part of code .before the for loop I have this arraylist :
[X :49.0 Y: 113.0 , angle :0.0, X :141.0 Y: 106.0 , angle :0.0, ... |
consider I have an array list like : [2,5,1,8,6]
and I want to remove all elements from 1 till the end .and the arraylist will be like :[2,5]
how can i do this?
thanks
... |
ArrayList have metod remove(int index) and remove(Object o), so
i try run this code:
public static void main(String args[]){
ArrayList<Long>ar=new ArrayList<Long>();
ar.add(11L);
ar.add(22L);
...
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This is part of my code.
Integer keyLocation = reducedFD.indexOf(KeyPlus.get(KEYindex));
someArrayList.remove(keyLocation);
So what I am doing here is I assign keyLocation(the first occurence of a string in the reducedFD arrayList). But when I want ... |
I try with a loop like that
// ArrayList tourists
for (Tourist t : tourists) {
if (t != null) {
...
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I have a bunch of indexes and I want to remove elements at these indexes from an ArrayList. I can't do a simple sequence of remove()s because the elements are shifted ... |
I have to print the list values in the form of String. But I am held up with the [ and ] in the list. Here is my code.
List dbid=new ArrayList();
dbid.add(ar.getdbID());
String ...
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A user has the ability to generate a set of MIDI events which are in turn added to an ArrayList and then iterated through and added to a Track object, waiting ... |
The method public boolean remove(Object o) of List removes an object from list but does not shift the elements following.Just nulls the object value.
IMHO this is an ... |
Suppose there are 10 elements in ArrayList and if i have deleted 2 elements from the middle , so the arraylist will contain 8 elements , but will the capacity be ... |
Hi I have to write a program that takes in number of candidate and how many votes they got from the best to the worst. And I wrote two different classes ... |
I want to remove values from a copy of an ArrayList without affecting the original copy. Code currently:
statsOf2Pairs runs first then statsOfFullHouse, but the original list is has its values removed ... |
I want to delete/remove an object from an array list of objects. Would this work if my class was:
class bookings {
public String getuser () {
return ...
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I have project to do and i have to add people to the database and then remove them but when i try to remove a person from the arraylist it works ... |
So I have this array, and I want to delete strings that are 2 or 4 characters in length (strings that contain 2 or 4 characters). I am doing this method, ... |
I am having an issue removing elements of a list while iterating through the list. Code:
For (WebElement element: list){
if (!element.isEnabled() || !element.isSelected()){
...
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This seems like a simple problem but I am having trouble nonetheless. So I know the indexes of the items I want to remove but if I put this in a loop and try to use the remove(index) call - that works fine for the first one - but since there was already one removed - now the indexes are screwed ... |
Hi! I get the UnsupportedOperationException exception when i try to run this code: public class Question21 { private int countryId = Integer.MIN_VALUE; public static void main(String[] args) { Question21[] q1 = new Question21[2]; q1[0] = new Question21(); q1[0].setCountryId(12); q1[1] = new Question21(); q1[1].setCountryId(15); Question21[] q2 = new Question21[1]; q2[0] = new Question21(); q2[0].setCountryId(15); Question21[] q3 = null; List list = Arrays.asList(q1); ... |
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I have an arraylist of String [] , and I need to be able get one at a specific location. How do I return a complete String [] array from an arraylist? Here is my code in 2 parts // String array insertion code into array // temp storage for trimmed hotel record values String[] recordValues = new String[8]; // ... ... |
Dear All, I am trying to use the standard add and remove methods within the arrayList class but I think there is something I do not understand /** Method to add a roadVehicle to the arrayList*/ public void add(int index, RoadVehicle roadVehicle) throws QueueFullException{ if (isFull()) {throw new QueueFullException(queue.size());} else {queue.add(roadVehicle); count ++; } } /**Method to remove a roadVehicle from ... |
Hello I have 2 arraylists (aryList1 contains 1s and 0s indicating indices that need updating or removing; and aryList2 contains the items that are to be updated or removed). The 2 arylists' size ARE the same. My update code for(int i=0; i < aryList1.size(); i++) { if(aryList1.get(i).toString().equals("1")) { [B]aryList2.remove(i);[/B] [B]aryList2.add(i,data);[/B] } else { continue; } } I found if I leave ... |
Ok, thanks for the advice everyone, what I finally did was this: public void onClick(Widget sender) { for (String termString : termsArr) { sb.append(" " + termString + " "); } test = sb.toString(); saveTermsToDelicious(test, urlString, descripString); } Basically it just gets all the objects form the arraylist, sets them as Strings. Then it adds all this strings to a string ... |
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Dear all, I have Three classes p1,p2,p3 and i had object for that perticular class's I had arraylist in which it stores all the objects of three different classes and i want to remove the objects of p3 in that arraylist with in one statement .and i had one clue that removeAll() method in collection which takes collection as its parameter.please ... |
So, you have a List inside a List? Then it's perfectly normal that you get it between [[ and ]]. The first [ ] are for the outer list, that contains one element, which is the inner list. The second [ ] are for the inner list. Why are you storing a list inside a list? |
Java Code: public class Contact { //attributes private String fName; private String lName; private int phNo; private String email; //constructor public Contact(String fName,String lName,int phNo,String email) { setFName(fName); setLName(lName); setPhNo(phNo); setEmail(email); } public Contact() { } //get set method public void setFName(String fName) { this.fName = fName; } public String getFName() { return this.fName; } //-------------------------------- public void setLName(String lName) { ... |
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The for loop "for(Bullet bu: buArray){" walks along the array. And in the course of this you remove part of the array which you are traversing. This is a bit like removing the floor on which you are walking! Both ArrayList and LinkedList (and maybe others) provide the following caution: "The iterators returned by this class's iterator and listIterator methods are ... |
Java Code: This is the error code I get when I insert a number into the parameter java.lang.IndexOutOfBoundsException: Index: 1, Size: 1 at java.util.ArrayList.RangeCheck(ArrayList.java:547) at java.util.ArrayList.remove(ArrayList.java:387) at Auction.removeLot(Auction.java:155) This is the method where I try to remove an element. Has any one an idea of where the problem is? /* * Remove the lot with the given lot number * @param ... |
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Hi guys this is my first question in this forum, thanks for the great work. Here is my question: I have an ArrayList called shipGridPlaces full of integers if I use this code: if(shipGridPlaces.contains(k)) { int j = setup.shipGridPlaces.indexOf(k); System.out.println("A hit!"); setup.shipGridPlaces.remove(j); } I can remove the integer k from the ArrayList with no problems. But how I can directly remove ... |
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The problem is I am confused on the topic... when explained the prof wrote all this then some diagrams and crossed a bunch of bs out so I was majorly lost b/c there was nothing good to take notes on.(he is retiring too!).. I think it had something to do with how variables within methods work and some of the values ... |
Something tells me that you want to remove the cup object that is defined by having "large" and "paper" strings in the constructor. For an arraylist to remove object o (i.e., myArrayList.remove(o), then the list must have an object e such that e.equals(o). You might need to play with your cup class's equals method. You also need to pass an object ... |
Cripes that's a lot of code. I didn't read through all of it, but here's about what you do: I'm assuming you won't be doing any best-approximation searching. Create a method that matches a name and returns the index of the name, then use the ArrayList.remove() on the index. Or, heck, you should be able to just use ArrayList.remove(name). Joe |
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Your ArrayList changes critically as you remove items, and in particular the array list index will not have the same meaning, will not be synchronized with the list. What if you do this using an iterator to remove items, or if you start from the top of the list and iterate down to the first item? |
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Hi Ejp, thx for the reply. I tried your same code before, but by taking the iterator down of 1 after having removed 1 item it makes the loop to skip 1 index in the array, so it does not throw the exception, but it prints (when using print as test) 1234579 so 10,8,6 have been removed in stead of 10,9,8 ... |
That is not a bug. That is behavior as defined by the API. From [ArrayList#remove(Object)|http://java.sun.com/javase/6/docs/api/java/util/ArrayList.html#remove(java.lang.Object)] remove public boolean remove(Object o) Removes the first occurrence of the specified element from this list, if it is present. If the list does not contain the element, it is unchanged. More formally, removes the element with the lowest index i such that (o==null ? get(i)==null ... |
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Hi there, I understand that according to you, your expected output should be a list with no elements. You intend to clear all elements. There is a problem with the logic implemented. You have a list like the given elements with respective indexes in brackets. a(0), b(1), c(2), d(3) When your loop runs first the index to be removed is zero, ... |
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This design smells funny to me. I don't like the idea of a soldier trying to directly play with the soldierList. It seems to be breaking some OOP rule, perhaps encapsulation. I may be totally off base here, and sorry if I am, but in a game such as this, I picture a class that controls the battle, perhaps class Battle ... |
You have two return a, I think you want to change the first one (inside the if statement) into the code that will remove your element. Now, since you are using an Array and not a re sizable object like an ArrayList the best thing you can do is replace that entry with a null value, then you would have to ... |
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Hello friends...I have a table in the database which i use to insert and retrieve data from..I select data from the table,add the retrieved data to an ArrayList object and display it using a jsp...My problem is that even when i run delete mytable command i get the same result.whereas i should get an empty list...I tried using clear() and removeAll(Collection) ... |
Why do you have to maintain a list of logged in users? Create a session object for each user when they've logged in and keep their credentials in it. When they log out, remove the credential and invalidate the session. No need for a central list. Just check to see if there's a session with valid credentials. % |