spot7.org logo
Home PHP C# C++ Android Java Javascript Python IOS SQL HTML Categories

Copying ArrayList to same and subtype ArrayLists?


In your second for loop you have:

for (int i = 1; i <
orderProcessor.size(); i++){
computerPart.add((ComputerPart)
orderProcessor.get(I)); 
}

If orderProcessor only had 1 order in it, then it would never get added to your coumputerPart arrayList because i would not be less than orderProcessor.size(). You can also check the types of your sub classes to add them into the correct ArrayList. Like this (with the int i = 0 fix):

for (int i = 0; i <
orderProcessor.size(); i++){
    if (orderProcessor.elementAt(i) instanceof
ComputerPart)
        computerPart.add((ComputerPart)
orderProcessor.get(I)); 
}

*(I would've commented on this, but I don't have enough rep points...)


Categories : Java

Related to : Copying ArrayList to same and subtype ArrayLists?
Sorting of arraylist of multiple arraylists
Indexes in Java begin at 0. The 7th element has the index 6. Moreover, you have to convert the String to int in order to be properly compared. Try this : Comparator<ArrayList<String>> cmp = new Comparator<ArrayList<String>>() { public int compare(ArrayList<String> a1, ArrayList<String> a2) { // TODO check for null value return new Integ

Categories : Java
Most efficient way to split one arraylist data into 4 seperate arraylists?
The main issue is that your details can have missing data. For example it has the size=5. Then your method will crush with IndexOutOfBounds. Your details list should contain a Person object which has all the details you want and then just use them to fill other lists.

Categories : Java
Generalizing a searching method between ArrayLists of classes
may sound hackish but you can do like some other users suggested and call public Object getByBarcode(String barcode, Class<T> classy) { ArrayList<Items> items = null; if(classy.class.getSimpleName().equals(Book.class.getSimpleName())) items = bookArray; else if(classy.class.getSimpleName().equals(Magazine.class.getSimpleName())) items = magazineArray; else

Categories : Java
Android ArrayList: check an element exists of another ArrayList
To be able to use methods to find and search like contains your custom class MUST implement correctly the hasCode and equals methods. Here is the link about the implementing hasCode and here about implementing equals. It is Java Best Practises website that I like very much and from where I've learned about it.

Categories : Java
hash map with arraylist and create new arraylist out of it
Get your ArrayList 2a. If it doesn't exist - put your new ArrayList 2b. Else USE this ArrayList. It's mutable. So you can call .add on this object and it will be updated in HashMap Try this: for (String type: allTypes) { if (fData.get(type).size() > 0) { arraySort(fData.get(type)); if (cData.get(type) == null) { temp = new ArrayList<Integ

Categories : Java
Recently Add
Redirecting the output directory of 'mvn package' or 'mvn compile' command
No suitable constructor found for ProductoExtranjero
java Composite design pattern(Directory &File)
Java JTree's ui refresh after removing node from parent
First REST Spring application
How to cancel Indexing of a Solr document using Update Request Processor
PowerMock - Mock a Singleton with a Private Constructor
Calling a Postgres stored function SQL error
Where to store Morphlines Java custom command class?
Generic repository using map
How can I scroll a ScrolledComposited in Eclipse SWT Design view?
2 Frames/layout in 1 Activity
Writing a switch differently
Next button opens another activity when its reaches the array limit
Is EclipseLink MOXy capable of applying JSR-303 Bean Validation when unmarshalling XML to object?
Why my jdk can't work,and before the java_home, there is a space that is not from me
How to add List of objects in a Map
How to make notepad++ function like regular notepad in cmd?
Cell renderer and the lost focus
how can I implement iterable for LinkedList>
Disable Androids image-crunch in eclipse (run as) builds
java 8 lambda myMap.stream().count() != myMap.size() after merging myMap
Issue with Calendar calculation that spans 2 calendar years
JSF 2.0 Spring bean injection
Java Regex ReplaceAll with grouping
Getting any word and last word using sed
Clicking on link on JEditorPane throws IOException
printing out difference of two arrays
Spring Bean Alias in JavaConfig
Using Factory Method to Create Generics
© Copyright 2017 spot7.org Publishing Limited. All rights reserved.