How to find index of STRING array in Java from a given value

Question

I wanted to know if there s a native method in array for Java to get the index of the table for a given value    Let s say my table contains these strings     public static final String   TYPES              Sedan            Compact            Roadster            Minivan            SUV            Convertible            Cargo            Others           Let s say the user has to enter the type of car and that then in the background the program takes that string and get s it s position in the array   So if the person enters   Sedan It should take the position 0 and store s it in the object of Cars created by my program

User · Answer

An easy way would be to iterate over the items in the array in a loop.

for (var i = 0; i < arrayLength; i++) {
 // (string) Compare the given string with myArray[i]
 // if it matches store/save i and exit the loop.
}

There would definitely be better ways but for small number of items this should be blazing fast. Btw this is javascript but same method should work in almost every programming language.

User · Answer

try this instead  org apache commons lang ArrayUtils indexOf array  value

User · Answer

There is no native indexof method in java arrays You will need to write your own method for this

User · Answer

Try this Function    public int indexOfArray String input        for int i 0 i lt TYPES length   i                      if TYPES i  equals input                        return i                              return -1        if the text not found the function return -1

User · Answer

Use this as a method with x being any number initially  The string y being passed in by console and v is the array to search   public static int getIndex int x  String y  String  v       for int m   0  m  lt  v length  m             if  v m  equalsIgnoreCase y                x   m                      return x

User · Answer

for  int i   0  i  lt  Types length  i          if TYPES i  equals userString            return i          return -1   not found   You can do this too   return Arrays asList Types  indexOf userSTring

User · Answer

I had an array of all English words  My array has unique items  But using     Arrays asList TYPES  indexOf myString        always gave me indexOutOfBoundException   So  I tried   Arrays asList TYPES  lastIndexOf myString     And  it worked  If your arrays don t have same item twice  you can use   Arrays asList TYPES  lastIndexOf myString

User · Answer

String carName      insert code here int index   -1  for  int i 0 i lt TYPES length i          if  TYPES i  equals carName             index   i          break            After this index is the array index of your car  or -1 if it doesn t exist

User · Answer

No built-in method  But you can implement one easily   public static int getIndexOf String   strings  String item        for  int i   0  i  lt  strings length  i              if  item equals strings i    return i            return -1

User · Answer

Type in   Arrays asList TYPES  indexOf  Sedan

User · Answer

Use Arrays class to do this  Arrays sort TYPES   int index   Arrays binarySearch TYPES   Sedan

User · Answer

Refactoring the above methods and showing with the use   private String   languages     pt    en    es    private Integer indexOf String   arr  String str      for  int i   0  i  lt  arr length  i          if arr i  equals str   return i     return -1    indexOf languages   en

User · Answer

Testable mockable interafce  public interface IArrayUtility lt T gt         int find T   list  T item        implementation  public class ArrayUtility lt T gt  implements IArrayUtility lt T gt          Override     public int find T   array  T search            if array    null    array length    0    search    null                return -1                     int position   0           for T item   array                 if item equals search                     return position                else                     position                                   return -1             Test   Test public void testArrayUtilityFindForExistentItemReturnsPosition            Arrange     String search    bus       String   array     car   search   motorbike            Act     int position   arrayUtility find array  search           Assert     Assert assertEquals position  1

[java] How to find index of STRING array in Java from a given value?

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