Question

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?

Answer 1

You need to use removeAll.

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