Compare First 3 Character String with List of String of Each String First 3 Character

Question

The Sample Code which needs a solution?

public class TestJJava {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

               


        

Answer 1

You aren't currently comparing the first three characters because subList doesn't actually apply a substring function (here it copies the list as is). You can also initialize your List more efficiently (and you should program to the List interface). I would stream() it and map each element using String.substring and anyMatch. Like,

String abc = "123XXXXX0";
List lstValues = new ArrayList<>(List.of("111XXXX1", "122XXX1", "123XXXX1"));
if (lstValues.stream().map(x -> x.substring(0, 3)).anyMatch(abc.substring(0, 3)::equals)) {
    System.out.println("**** Match Found ***");
} else {
    System.out.println("**** No Match Found ****");
}

Which outputs

**** Match Found ***