java - String search with "startsWith()" -
i've been working on email directory program past couple of day , in 1 of methods i'm trying make search function searches email based off character inputs of user. i'm trying make method loops , user types in email 1 character @ time until 1 email in array constructed method.
heres code:
private void searchcontact() { string[] newrecords=new string[emailrecords.size()]; //temp array searching arraylist<string> searchrecords=new arraylist<string>(); //to passed insertion sort newrecords=emailrecords.toarray(newrecords); for(string records: newrecords) { scanner search=new scanner(system.in); //setup user input string letter; string searchval; system.out.println("please enter first letter of email you're trying find."); letter=search.nextline(); if (searchrecords.size()!=1) { (int i=0; i<newrecords.length;i++) //counter indexes { searchval=newrecords[i]; //set temp value set index if (searchval.startswith(letter)) //starts boolean { searchrecords.add(searchval); //add temp array later comparison } } } else { break; //break if 1 remains in array. } } system.out.println(searchrecords); //todo erase when finalizing } and here's happens when run program entering names starting same letter:
please enter number of option choice: 1. add new contact 2. search exsisting contact 3. exit 1 please enter email adress. mark ***mark stored.*** please enter number of option choice: 1. add new contact 2. search exsisting contact 3. exit 1 please enter email adress. mike ***mike stored.*** please enter number of option choice: 1. add new contact 2. search exsisting contact 3. exit 1 please enter email adress. molly ***molly stored.*** please enter number of option choice: 1. add new contact 2. search exsisting contact 3. exit 2 please enter first letter of email you're trying find. m please enter first letter of email you're trying find. please enter first letter of email you're trying find. r [mark, mike, molly] please enter number of option choice: 1. add new contact 2. search exsisting contact 3. exit and here expected output after enter in information , try search "mark" entering "m", "a", "r", , "k":
please enter next letter of email you're trying find. m please enter next letter of email you're trying find. please enter next letter of email you're trying find. r please enter next letter of email you're trying find. k [mark] i tried make loop on outside of other counts , use move index of given string failed. feel i'm close overlooking something. advise or strategies appreciated! million.
assuming emailrecords contains of emails, task like:
private void searchcontact() { assert(!(emailrecords == null || emailrecords.isempty()));// :p //initially copy arraylist<string> searchrecords = new arraylist<>(emailrecords); //prepare scanner scanner search = new scanner(system.in); //initialize query string query = ""; //loop: while (searchrecords.size() > 1) { system.out.println("please enter first letter of email you're trying find."); //read input query += search.nextline(); //iterate through remaining searchrecords (iterator<string> = searchrecords.iterator(); it.hasnext();) { final string entry = it.next(); if (!entry.startswith(query)) {//...conditionally it.remove();//..remove (from searchrecords) } } } //print output - first/last of searchrecords if (!searchrecords.isempty()) system.out.println(searchrecords.get(0)); else system.out.println("no record found."); }