Find the difference set between two arrays

• Java 
import java.util.ArrayList;

public class array_diffrence {
    public static void main(String[] args) {
        ArrayList array1=new ArrayList();
        ArrayList array2=new ArrayList();
        array1.add("common1");
        array1.add("common2");
        array1.add("notcommon1");
        array1.add("notcommon");
        array2.add("common1");
        array2.add("common2");
        array2.add("notcommon2");
        array2.add("notcommon3");
        array2.removeAll(array1);
        System.out.print("差集为："+array2);
    }
}

The output result is:

The difference set is: [notcommon2, notcommon3]

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