How to search for a string in an arraylist

Question

I want to search for a string in an arraylist  My ArrayList contains    ArrayList  lt String gt  list   new ArrayList     list add  behold    list add  bend    list add  bet    list add  bear    list add  beat    list add  become    list add  begin      Now I want to search for  bea  and it should return a list containing  bear  and  beat   How can I implement it

User · Answer

Loop through your list and do a contains or startswith.

ArrayList<String> resList = new ArrayList<String>();
String searchString = "bea";

for (String curVal : list){
  if (curVal.contains(searchString)){
    resList.add(curVal);
  }
}

You can wrap that in a method. The contains checks if its in the list. You could also go for startswith.

User · Answer

List  lt String gt  list   new ArrayList                 list add  behold                list add  bend                list add  bet                list add  bear                list add  beat                list add  become                list add  begin                List  lt String gt  listClone   new ArrayList lt String gt                 for  String string   list                   if string matches    i  bea                           listClone add string                                         System out println listClone

User · Answer

May be easier using a java util HashSet  For example     List  lt String gt  list   new ArrayList lt String gt        list add  behold      list add  bend      list add  bet         Load the list into a hashSet   Set lt String gt  set   new HashSet lt String gt  list     if  set contains  bend            System out println  String found

User · Answer

Since your list doesn t appear to be sorted  you have to iterate over its elements  Apply startsWith   or contains   to each element  and store matches in an auxiliary list  Return the auxiliary list when done

User · Answer

The Best Order I ve seen         SearchList is your List      TEXT is your Search Text    SubList is your result                      ArrayList lt String gt  TempList   new ArrayList lt String gt                                SearchList                        int temp   0                      int num   0                      ArrayList lt String gt  SubList   new ArrayList lt String gt                         while  temp  gt  -1                            temp   TempList indexOf new Object                                  Override                             public boolean equals Object obj                                    return obj toString   startsWith TEXT                                                                                     if  temp  gt  -1                             SubList add SearchList get temp   num                               TempList remove temp

User · Answer

import java util    class ArrayLst       public static void main String args                  ArrayList lt String gt  ar   new ArrayList lt String gt             ar add  pulak            ar add  sangeeta            ar add  sumit    System out println  Enter the name     Scanner scan new Scanner System in   String st scan nextLine    for String lst  ar    if st contains lst     System out println st  is here     break    else   System out println  OOps search can t find     break

User · Answer

List  lt String gt  list   new ArrayList                 list add  behold                list add  bend                list add  bet                list add  bear                list add  beat                list add  become                list add  begin                List  lt String gt  listClone   new ArrayList lt String gt                 Pattern pattern   Pattern compile  bea  Pattern CASE INSENSITIVE     incase u r not concerned about upper lower case            for  String string   list                   if pattern matcher string  find                         listClone add string                      continue                                        System out println listClone

User · Answer

First you have to copy  from AdapterArrayList to tempsearchnewArrayList   Add ListView items into tempsearchnewArrayList     because then only you can compare whether search text is appears in Arraylist or not      After creating temporary arraylist  add below code       searchEditTextBox addTextChangedListener new TextWatcher              Override         public void beforeTextChanged CharSequence charSequence  int i  int i1  int i2                       Override         public void onTextChanged CharSequence charSequence  int i  int i1  int i2                String txt   charSequence toString   trim                int txtlength   txt length                if  txtlength  gt  0                    AdapterArrayList   new ArrayList lt HashMap lt String  String gt  gt                     for  int j   0  j lt  tempsearchnewArrayList size    j                          if  tempsearchnewArrayList get j  get  type   toLowerCase   contains txt                             AdapterArrayList add tempsearchnewArrayList get j                                                          else                   AdapterArrayList   new ArrayList lt HashMap lt String  String gt  gt                     AdapterArrayList addAll tempsearchnewArrayList                             adapter1 notifyDataSetChanged                if  AdapterArrayList size    gt  0                    mainactivitylistview setAdapter adapter1                 else                   mainactivitylistview setAdapter null                                     Override         public void afterTextChanged Editable editable

User · Answer

Better way is to use matches   method on every String element of the array  This will help you to search any pattern through regular expressions

User · Answer

Nowadays  Java 8 allows for a one-line functional solution that is cleaner  faster  and a whole lot simpler than the accepted solution  List lt String gt  list   new ArrayList lt  gt     list add  quot behold quot    list add  quot bend quot    list add  quot bet quot    list add  quot bear quot    list add  quot beat quot    list add  quot become quot    list add  quot begin quot     List lt String gt  matches   list stream   filter it - gt  it contains  quot bea quot    collect Collectors toList      System out println matches       bear  beat   And even easier in Kotlin  val matches   list filter   it contains  quot bea quot

[java] How to search for a string in an arraylist

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