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Create a new ArrayList with all the elements of another ArrayList except one in one line of code


Create a new ArrayList with all the elements of another ArrayList except one in one line of code

By : coplo
Date : October 21 2020, 08:10 PM
this will help I would love to do this in one line: , The simplest way is to use subList:
code :
function(new ArrayList<>(oldArray.subList(1, oldArray.size())));


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Code for deleting rows from ArrayList#1 that appear in another ArrayList#2 and are non-unique in ArrayList#1

Code for deleting rows from ArrayList#1 that appear in another ArrayList#2 and are non-unique in ArrayList#1


By : 高英杰
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Try with the following. Despite minor changes, most of the code is generated by Netbeans IDE 7.0:
code :
@Override
public boolean equals(Object obj) {
    if (this == obj) {
        return true;
    }
    if (obj == null) {
        return false;
    }
    if (getClass() != obj.getClass()) {
        return false;
    }
    final Row other = (Row) obj;
    if ((this.key == null) ? (other.key != null) : !this.key.equals(other.key)) {
        return false;
    }
    if (!java.util.Arrays.deepEquals(this.values, other.values)) {
        return false;
    }
    return true;
}

@Override
public int hashCode() {
    int hash = 3;
    hash = 79 * hash + (this.key != null ? this.key.hashCode() : 0);
    hash = 79 * hash + java.util.Arrays.deepHashCode(this.values);
    return hash;
}
Java adding ArrayList<Integer> to ArrayList<ArrayList<Integer>> replaces all elements of the ArrayList

Java adding ArrayList<Integer> to ArrayList<ArrayList<Integer>> replaces all elements of the ArrayList


By : Darren Jones
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You are not creating a new Instance of temp everytime you call below, the same list is added into the list, which you are clearing.Remember it is the reference of the list which is added.
code :
 public static void addToList(int num, ArrayList<ArrayList<Integer>> list)
    //Splits the two parts of the number and inserts the arraylist into the proper arraylist
    {
      //  temp.clear();// this is the issue do below
        ArrayList<Integer> temp = new ArrayList<Integer>();
        int numInt_one = Integer.parseInt(String.valueOf(num).substring(0,2));  
        int numInt_two = Integer.parseInt(String.valueOf(num).substring(2,4));  
        temp.add(numInt_one);
        temp.add(numInt_two);
        list.add(temp);
    }
How to create ArrayList (ArrayList<T>) from array of primitive type elements

How to create ArrayList (ArrayList<T>) from array of primitive type elements


By : Vishal Hegde
Date : March 29 2020, 07:55 AM
wish helps you It is not possible with standard Java to have Collections on primitive types. However there are some libraries available (like trove or apache commons primitives) to achieve this.
This has great performance implications. The Boxed Types of the primitives have a massive amount of (mostly unneeded) overhead, because every boxed object extends the java basic Object (i think the overhead is somewhere at 8 bytes per object). I a List with for instance 1000 Integers you have 1000 times the overhead, which can be bad for your memory. So if memory consumption is an issue, primitive collections are a great way to deal with it.
I have an ArrayList that contains an ArrayList<Integer>. I am having trouble removing elements from the ArrayList&

I have an ArrayList that contains an ArrayList<Integer>. I am having trouble removing elements from the ArrayList&


By : Manjula Reddy
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further All your elements in gamePiles are referring to the same list. When you change one of them, they all will change because they are referring to the exact same list.
Try replacing this:
code :
for(int z = 0; z < arbitraryPiles; z++){
    gamePiles.add(Coins);
}
for(int z = 0; z < arbitraryPiles; z++){
  gamePiles.add(new ArrayList<>(Coins));
}
Java arraylist of arraylist - create a multi dimensional arraylist with a class object

Java arraylist of arraylist - create a multi dimensional arraylist with a class object


By : doan dinh Tuan
Date : March 29 2020, 07:55 AM
Hope this helps I'm looking to create an arraylist of arraylist. , Instead of:
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