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Last active October 10, 2019 17:40
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Compare members of different lists in Java
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Compare-Lists-Java.md

Java Collections has some built-in features; e.g. retainAll and removeAll.

//listOne.retainAll(listTwo);
listOne.removeAll(listTwo);

Note: Sets do not allow duplicates.

Collection<String> similar = new HashSet<String>( listOne );
Collection<String> different = new HashSet<String>();
different.addAll( listOne );
different.addAll( listTwo );

similar.retainAll( listTwo );
different.removeAll( similar );

System.out.printf("One:%s%nTwo:%s%nSimilar:%s%nDifferent:%s%n", listOne, listTwo, similar, different);

Source: Java Compare Two Lists

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