Check if all strings in one array are present in another array

Question

I have two arrays of strings:

String[] A = {"AQBC","BSA","BAA"}

String[] B = {"AWF","AQBC","SSA","SFW","BSA","WQQR","WEWQ","BAA","RDR","GGWQ","GQEW"}

I want to check if all elements of array A are in array B. What is the easiest way to do it?

The easiest would be to use Sets; build setA and setB and check that setB.containsAll(setA) — fge
– fge, Commented Apr 12, 2014 at 20:30

Christian Tapia · Accepted Answer · 2014-04-12 20:35:06Z

2

Arrays.asList(B).containsAll(Arrays.asList(A));

The easiest. Not the fastest.

edited Apr 12, 2014 at 20:35

Christian Tapia

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answered Apr 12, 2014 at 20:31

Bernd Ebertz

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Comments

amatellanes · Accepted Answer · 2014-04-12 20:37:41Z

2

Converts your arrays into set to remove possible duplicated elements ans then containsAll() returns true if setB contains all of the elements of setA:

Set<T> setA = new HashSet<T>(Arrays.asList(A));
Set<T> setB = new HashSet<T>(Arrays.asList(B));
setB.containsAll(setA)

edited Apr 12, 2014 at 20:37

answered Apr 12, 2014 at 20:32

amatellanes

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Comments

Kevbear · Accepted Answer · 2014-04-12 20:40:23Z

0

You can try this is to make String Array A and B compare in a array. and sort them

String[] A = {"AQBC","BSA","BAA"}

String[] B = {"AWF","AQBC","SSA","SFW","BSA","WQQR","WEWQ","BAA","RDR","GGWQ","GQEW"}

compareStringArray(A, B, true);

public static void printArrayListOfString(List Al) {

for (int i = 0; i < Al.size(); i++) {

if (i != 0) {

  System.out.print(", ");
}

System.out.print(Al.get(i));

}

System.out.println();

}

answered Apr 12, 2014 at 20:40

Kevbear

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