CODEWITHSUNDEEP
javaarraylisthashmapstring-comparison
ln3106
ln3106

Reputation: 123

Find common elements in two string list java

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.

Upvotes: 0

Views: 194

Answers (2)

Wahid Sadik
Wahid Sadik

Reputation: 928

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.

Upvotes: 2

maveriq
maveriq

Reputation: 516

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]

Upvotes: 3

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