issue in adding two arraylist

I have two arrayList ArrayList ar1 = new ArrayList(); ArrayList ar2 = new ArrayList(); **ar1** is having values { A,B,C,D} and **ar2** is having values {1,2,3,4} I want to add these two array list such that output should be A 1 B 2 C 3 D 4 I have used ar1.addrange(ar2); and the output is like this A B C D 1 2 3 4 Any suggestions how to resolve this?

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