我怎么知道给定字符串的一部分是否是Arraylist中的字符串 <String> ？

Question

I'm doing a homework assignment and I'm having a hard time trying to find out how to figure out if part of a given String is a string in an Arraylist of String.

Example of given string:

loveaspd
asdhouseaspd

arraylist of string: love, house, home, dog, amuse, problem...

I have tried to use contains but just realized it will not help me once I have to check each letter.

Example: loveaspr

my program is supposed to check the word love , so it will see if the first letter matches and go to the second letter. So, after reading the word love , the output will be:

love exists.

The the program will check the letter a . There is a word with the letter a in my arrayList so it will check the second letter and will see that there is no such word where the first letter is a and the second is s . then a will be rejected and s will be rejected.

The last part of the string will be checked (note that I have the word problem in my arrayList, so the program will check the first and second letter and then both will be rejected together).

Therefore, my output should be:

love exists.
a rejected.
s rejected.
pr rejected.

The problem is that I don't know how to check each letter in each word of my ArrayList. I'm not asking for someone to code my homework for me. I'm looking for someone who could say which topic I should study (specifically) or give an example of something related to my issue in order to complete the task (it is due tomorrow).

Thanks in advance,

Ian Pierre.

Answer 1

Go on like this

ArrayList<String> ar = new ArrayList<String>();
        for (String a : ar) {
            if (a.contentEquals("any_string_here") || a.equalsIgnoreCase("any_string_here")) {
                System.out.println("Found");
            }
        }

Answer 2

One option is to iterate the list, and use String.indexOf() to determine partial matches. Here is an example:

  private static String match(List<String> mots, String searchPhrase) {
        for(String mot : mots) {
            if(searchPhrase.indexOf(mot) >= 0) {
                return mot;
            }
        }
        return "No Match Found.";
    }

    //Test
    public static void main(String[] args) {
        List<String> mots = new ArrayList<>();
        mots.add("un");
        mots.add("deux");
        mots.add("trois");
        String searchPhrase = "lesdeuxchats";
        System.out.println( match(mots,searchPhrase) );  //Output = "deux"
    } 

Answer 3

String s;
ArrayList<String> list= new ArrayList<String>();
int i,j;

for(i=0;i<s.length;i++)
{
    for(j=i+1;j<s.length;j++){
        if(list.contains(s.substring(i,j)){
            System.out.println("The list contains "+s.substring(i,j));
        }
    }
}

Substrings ( http://www.tutorialspoint.com/java/java_string_substring.htm ) are the way to get parts of your original string.

Answer 4

public class SO {       
    public static void main(String[] args) {
        ArrayList<String> al = new ArrayList<String>();
        al.add("ABC");
        al.add("DEF");
        al.add("GHI");
        al.add("JKL");
        al.add("MNO");

        for (String arrList : al) {
            if(arrList == "GHI"){
                System.out.println("Found");
            }
        }
        }       
    }