Comparing elements from 2 string arrays in java

Question

I have 2 String arrays say A and B. both contains some strings. I want to compare array A with B to find the elements which are exist in both arrays.....

String[] a=new String[] {"alpha","beta"};
String[] b=new String[] {"alpha","beta","gamma","xxxx","yyyy"};

the result which I needed is alpha and beta...

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score 0 · Accepted Answer · answered Oct 04 '15 at 11:22

You can use retainAll method from Collection.

String[] a=new String[] {"alpha","beta"};
String[] b=new String[] {"alpha","beta","gamma","xxxx","yyyy"};
HashSet<String> set1 = new HashSet<String>(Arrays.asList(a));
HashSet<String> set2 = new HashSet<String>(Arrays.asList(b));
set1.retainAll(set2);
System.out.println(set1);     //Output : [alpha, beta]

score 0 · Answer 2 · edited May 23 '17 at 11:59

0

If you want the intersection of two arrays, you can have a look here : Java, find intersection of two arrays.

edited May 23 '17 at 11:59

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answered Oct 04 '15 at 11:23

Gaël J

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Comparing elements from 2 string arrays in java

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