Find common elements in two string list java-CodePudding

i have two String list in java and i want to get common element of two list. I use the retainAll method but it doesn't work

String csv = "Apple, Google, Samsung";
List<String> csvList = Arrays.asList(csv.split(","));
ArrayList<String> list0= new ArrayList<String>(csvList);
ArrayList<String> list1 = new ArrayList<String>();
list1.add("Apple");
list1.add("Asus");
list1.add("Lenovo"); 
list1.add("Google");
list1.retainAll(list0);

list1.retainAll(list0); return list1 empty . list1 must return ==> "Apple, Google, Samsung"

how can i return a list of common element in two string list please help.

CodePudding user response：

The issue is in your input string:

String csv = "Apple, Google, Samsung";

When parsing, spaces are not automatically truncated, so later retainAll interprets them as different strings, like Google and Google.

You can either remove your spaces from the input string or trim them manually.

Correct output for your inputs would be:

[Apple, Google]

CodePudding user response：

Take a look at this: String csv = "Apple, Google, Samsung";

After the split, the second and third elements will be Google and Samsung, which are different from Google and Samsung.