arraylist Archives - Page 2 of 8

Java ArrayList how to add elements at the beginning

I need to add elements to an ArrayList queue whatever, but when I call the function to add an element, I want it ...

May 25, 2022
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Java: how can I split an ArrayList in multiple small ArrayLists?

How can I split an ArrayList (size=1000) in multiple ArrayLists of the same size (=10) ? ArrayList<Integer> results; 21 Answers 21

May 24, 2022
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Java ArrayList replace at specific index

I need help with this java please. I created an ArrayList of bulbs, and I’m trying to replace a bulb at specific index ...

May 22, 2022
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Difference between if (a – b < 0) and if (a < b)

I was reading Java’s ArrayList source code and noticed some comparisons in if-statements. In Java 7, the method grow(int) uses if (newCapacity - ...

May 22, 2022
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Java ArrayList copy

I have an ArrayList l1 of size 10. I assign l1 to new list reference type l2. Will l1 and l2 point to ...

May 21, 2022
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How to avoid java.util.ConcurrentModificationException when iterating through and removing elements from an ArrayList

I have an ArrayList that I want to iterate over. While iterating over it I have to remove elements at the same time. ...

May 20, 2022
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ArrayList initialization equivalent to array initialization [duplicate]

This question already has answers here: Create ArrayList from array (40 answers) Initialization of an ArrayList in one line (33 answers) Closed 5 ...

May 17, 2022
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Java List.add() UnsupportedOperationException

I try to add objects to a List<String> instance but it throws an UnsupportedOperationException. Does anyone know why? My Java code: String...

May 17, 2022
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What is the difference between ArrayList.clear() and ArrayList.removeAll()?

Assuming that arraylist is defined as ArrayList<String> arraylist, is arraylist.removeAll(arraylist) equivalent to arraylist.clear()? If so, can I assume that the clear() method is ...

May 17, 2022
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