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I'm having trouble with what I thought should be a pretty simple problem.
I need to compare every item in an arrayList with every other item in the the list without comparing items to themselves. It's not as simple as calling an equals() comparison, it involves some custom logic that I've omitted from my code below. Also the ArrayList should not be changed in any way.
The problem I seem to be having is that once I get into the second loop, I don't know if I have another object to compare to (since its a variable sized list).
for(int i =0; i< list.size(); i++){ //get first object to compare to String a = list.get(i).getA(); Iterator itr = list.listIterator(i + 1 ); // I don't know if i + 1 is valid while(itr.hasNext()){ // compare A to all remaining items on list } } I think I probably going about this the wrong way, I'm open to suggestions or tips on how to do this better.
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The ArrayList. equals() is the method used for comparing two Array List. It compares the Array lists as, both Array lists should have the same size, and all corresponding pairs of elements in the two Array lists are equal. Parameters: This function has a single parameter which is an object to be compared for equality.
The containsAll() method of List interface in Java is used to check if this List contains all of the elements in the specified Collection. So basically it is used to check if a List contains a set of elements or not.
The forEach() method of ArrayList used to perform the certain operation for each element in ArrayList. This method traverses each element of the Iterable of ArrayList until all elements have been Processed by the method or an exception is raised.
for (int i = 0; i < list.size(); i++) { for (int j = i+1; j < list.size(); j++) { // compare list.get(i) and list.get(j) } } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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