Why not try regular expressions?

function boolean s1(String longString, List<String> StrList){

for(String str : StrList){
    if(longString.contains(str)){
        return true;
    }
}
return false;

}

Is your requirement to determine whether an element in a string array is a substring of another string? If so, you can write a method:

public class Main {

    public static void main(String[] args) {
        String[] strings = {"www", "http"};
        String sourceString = "https://www.baidu.com/";
        boolean contain = contains(sourceString, strings);
        System.out.println(contain);//是否包含
    }

    private static boolean contains(String sourceString, String[] strings) {
        boolean contain = false;
        for (String s : strings) {
            if (sourceString.contains(s)) {
                contain = true;
            }
        }
        return contain;
    }

}