CODEWITHSUNDEEP
java
Jeeva123
Jeeva123

Reputation: 1047

Android Compare Two Array?

I have one problem, I need to compare two arrays and I want to get unmatched values.

Example:

List<String> Array1=new ArrayList<String>();
List<String> Array2=new ArrayList<String>();
List<String> Array3=new ArrayList<String>();

Array1.add("1");
Array1.add("23");
Array1.add("1211");
Array1.add("12232");
Array1.add("231");
Array1.add("2231");

Array2.add("1");
Array2.add("23");
Array2.add("231");
Array2.add("2231");

// Array3 values are 1211 12232

Is this possible?

Upvotes: 0

Views: 2932

Answers (3)

invariant
invariant

Reputation: 8900

use Set ( It will remove duplicates too )

 Set<String> set1 = new HashSet(array1);
 Set<String> set2 = new HashSet(array2);
 set1.removeAll(set2);

Upvotes: 3

Amit Deshpande
Amit Deshpande

Reputation: 19185

You need to use removeAll.

List<String> array3 = new ArrayList<String>(array1);//Create copy of array 1
array3.removeAll(array2);//Remove common elements

Upvotes: 3

Khantahr
Khantahr

Reputation: 8518

You'll have to do it yourself, but it's not terribly hard. One possible solution:

Collections.sort( Array2 );  // Don't need this one if Array2 is already sorted.
for( String s : Array1 ) {
    if ( Collections.binarySearch( Array2, s ) < 0 )
        Array3.add( s );
}

Upvotes: 0

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