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java Programming Glossary: listbHow to cast a list of inheriting objects to a collection of objects in Java? http://stackoverflow.com/questions/2754756/how-to-cast-a-list-of-inheriting-objects-to-a-collection-of-objects-in-java Collection A collecA And I've a list in my object List B listB Where B is extending A class B extends A ... But I can't do.. class B extends A ... But I can't do the following collecA listB I can't understand why since Collection is implemented by List... describe class B extends A ... Collection A collecA List B listB collecA listB normally an error but lets pretend its allowed..
http://stackoverflow.com/questions/5943330/common-elements-in-two-lists this question Use Collection#retainAll . listA.retainAll listB listA now contains only the elements which are also contained.. now contains only the elements which are also contained in listB. If you want to avoid that changes are being affected in listA.. common new ArrayList Integer listA common.retainAll listB common now contains only the elements which are contained in..
http://stackoverflow.com/questions/6504208/another-java-generic-question extends Able list Collection A listA Collection B listB list listA list listB That is indeed the reason why the wildcard.. list Collection A listA Collection B listB list listA list listB That is indeed the reason why the wildcard notation Collection.. at compile time listA.add new B not valid at compile time listB.add new B valid at compile time listB.add new A not valid at..
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