How to sort alphabetically while ignoring case sensitive

Question

I have this code  but works only for lower case letters   I want this to sort the list while ignoring the upper case letters    package sortarray com   import java util ArrayList  import java util List   import android app Activity  import android os Bundle  import android util Log  import android widget TextView   public class SortArray extends Activity       ArrayList lt String   gt  matchedFruits   new ArrayList lt String   gt         TextView selection        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main            String fruits     new String 7     Sorted array         fruits 0     apple           fruits 1     apricot           fruits 2     banana           fruits 3     mango           fruits 4     melon           fruits 5     pineapple           fruits 6     peach           char currChar   fruits 0  charAt 0     Get first char of first element          boolean match   false          int len   fruits length          List lt String gt  tmp   new ArrayList lt String gt              for  int i   1  i  lt  len  i                  Log d  Comparing    fruits i  charAt 0          currChar               if  fruits i  charAt 0     currChar                    if  match    false    new match                                        match   true    Reset search                     tmp clear      clear existing items                     tmp add fruits i - 1                        Log d  Started new list    fruits i - 1                      else                       tmp add fruits i - 1                        Log d  Added to list    fruits i - 1                                    else                   match   false                  tmp add fruits i - 1                    matchedFruits add tmp toArray new String tmp size         add to                                                                            final                                                                            list                 Log d  Finished a list    fruits i - 1                    tmp clear      clear existing items                            currChar   fruits i  charAt 0                      tmp add fruits len - 1            matchedFruits add tmp toArray new String tmp size         add left over                                                                    items         printList               void printList               Print the list          TextView selection    TextView  findViewById R id tv           String mssg         for int i 0 i lt matchedFruits size   i                      String tmp2    matchedFruits get i                for  int j   0  j  lt  tmp2 length  j                        Log d  Final list    Array      i         j          tmp2 j                    mssg    tmp2 j  toString                                 selection setText   n                selection setText mssg

User · Answer

I like the comparator class SortIgnoreCase  but would have used this  public class SortIgnoreCase implements Comparator lt String gt        public int compare String s1  String s2            return s1 compareToIgnoreCase s2         Cleaner

User · Answer

Collections sort   lets you pass a custom comparator for ordering  For case insensitive ordering String class provides a static final comparator called CASE INSENSITIVE ORDER   So in your case all that s needed is   Collections sort caps  String CASE INSENSITIVE ORDER

User · Answer

You can directly call the default sort method on the list like this   myList sort String CASE INSENSITIVE ORDER      reads as the problem statement and cleaner   or   myList sort String  compareToIgnoreCase       reads as the problem statement and cleaner

User · Answer

Here is an example to sort an array   Case-insensitive  import java text Collator  import java util Arrays   public class Main     public static void main String args           String   myArray   new String      A    B    b         Arrays sort myArray  Collator getInstance        System out println Arrays toString myArray                Output  A  b  B

User · Answer

It is very unclear what you are trying to do  but you can sort a list like this   List lt String gt  fruits   new ArrayList lt String gt  7    fruits add  Pineapple    fruits add  apple    fruits add  apricot    fruits add  Banana    fruits add  mango    fruits add  melon            fruits add  peach     System out println  Unsorted      fruits    Collections sort fruits  new Comparator lt String gt           Override     public int compare String o1  String o2                          return o1 compareToIgnoreCase o2              System out println  Sorted      fruits

User · Answer

did you tried converting the first char of the string to lowercase on if fruits i  charAt 0     currChar  and char currChar   fruits 0  charAt 0  statements

User · Answer

In your case you have a List of Strings and most of the already proposed solutions  I specially like  guyblank answer  are just fine but     if you have a List of beans  which is my case  you can use Comparable interface in your bean like this   public class UserBean implements Comparable lt UserBean gt        private String name     private String surname             private Integer phone         GETTERS AND SETTERS     public int compareTo UserBean bean           return name compareToIgnoreCase bean name             Then you only need to create your ArrayList lt UserBean gt  userBeanArray   new ArrayList lt UserBean gt      fill it and sort it  Collections sort userBeanArray    And you have it done   Hope to help to community  -

User · Answer

Collections sort listToSort  String CASE INSENSITIVE ORDER

User · Answer

Since Java 8 you can sort using the Streams API   List lt String gt  fruits   Arrays asList  apple    Apricot    banana     List lt String gt  sortedFruit   fruits stream          sorted String CASE INSENSITIVE ORDER         collect Collectors toList      The difference with Collections sort is that this will return a new list and will not modify the existing one

User · Answer

I can t believe no one made a reference to the Collator  Almost all of these answers will only work for the English language   You should almost always use a Collator for dictionary based sorting   For case insensitive collator searching for the English language you do the following   Collator usCollator   Collator getInstance Locale US   usCollator setStrength Collator PRIMARY   Collections sort listToSort  usCollator

User · Answer

Pass java text Collator getInstance   to Collections sort method   it will sort Alphabetically while ignoring case sensitive           ArrayList lt String gt  myArray   new ArrayList lt String gt             myArray add  zzz            myArray add  xxx            myArray add  Aaa            myArray add  bb            myArray add  BB            Collections sort myArray Collator getInstance

User · Answer

Here s a plain java example of the best way to do it   import java util ArrayList  import java util Collections  import java util Comparator  import java util List   public class Sorter       String fruits     new String 7       List lt String gt  lst       Sorter             lst   new ArrayList lt String gt                initialise UNSORTED array         fruits 0     Melon   fruits 1     apricot   fruits 2     peach           fruits 3     mango   fruits 4     Apple     fruits 5     pineapple           fruits 6     banana              public static void main String   args            Sorter srt   new Sorter            srt anyOldUnstaticMethod               public void anyOldUnstaticMethod             Collections addAll lst  fruits           System out println  Initial List            for  String s   lst              System out println s           Collections sort lst           System out println   nSorted List            for  String s   lst              System out println s           Collections sort lst  new SortIgnoreCase             System out println   nSorted Ignoring Case List            for  String s   lst              System out println s              public class SortIgnoreCase implements Comparator lt Object gt            public int compare Object o1  Object o2                String s1    String  o1              String s2    String  o2              return s1 toLowerCase   compareTo s2 toLowerCase

User · Answer

In your comparator factory class  do something like this    private static final Comparator lt String gt  MYSTRING COMPARATOR   new Comparator lt String gt           Override     public int compare String s1  String s2          return s1 compareToIgnoreCase s2                 public static Comparator lt String gt  getMyStringComparator         return MYSTRING COMPARATOR    This uses the compare to method which is case insensitive  why write your own   This way you can use Collections sort like this   List lt String gt  myArray   new ArrayList lt String gt       fill your array here     Collections sort MyArray  MyComparators  getMyStringComparator

User · Answer

Example using Collections and ArrayList   Develop an intern static class like the example  CompareStrings    Call the intern static class in the main method   Easy to understand and works fine   import java util ArrayList  import java util Collections  import java util Comparator   public class MainClass       public static void main String   args            ArrayList lt String gt  myArray   new ArrayList lt String gt             myArray add  zzz            myArray add  xxx            myArray add  Aaa            myArray add  bb            myArray add  BB            Collections sort myArray  new MainClass CompareStrings             for String s   myArray                System out println s                        public static class CompareStrings implements Comparator lt String gt             Override         public int compare String s1  String s2               return s1 compareToIgnoreCase s2

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Array Sorting in Java 8 Way-  Easy peasy lemon squeezy  String   names     Alexis    Tim    Kyleen    KRISTY       Arrays sort names  String  compareToIgnoreCase     I used method Reference String  compareToIgnoreCase

[java] How to sort alphabetically while ignoring case sensitive?

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