Java read file and store text in an array

Question

I know how to read a file with Java using Scanner and File IOException  but the only thing I don t know is how to store the text in the files as an array    Here is a snippet of my code    public static void main String   args  throws IOException         TODO code application logic here            read KeyWestTemp txt         create token1     String token1               for-each loop for calculating heat index of May - October          create Scanner inFile1     Scanner inFile1   new Scanner new File  KeyWestTemp txt             while loop     while inFile1 hasNext                 how can I create array from text read              find next line         token1   inFile1 nextLine      Here is what my KeyWestTemp txt file contains   70 3    70 8    73 8    77 0    80 7    83 4    84 5    84 4    83 4    80 2    76 3    72 0

User · Answer

If you don t know the number of lines in your file  you don t have a size with which to init an array  In this case  it makes more sense to use a List    List lt String gt  tokens   new ArrayList lt String gt     while  inFile1 hasNext          tokens add inFile1 nextLine         After that  if you need to  you can copy to an array    String   tokenArray   tokens toArray new String 0

User · Answer

while inFile1 hasNext          token1   inFile1 nextLine            put each value into an array with String split        String   numStrings   line split                parse number string into doubles      double   nums   new double numString length        for  int i   0  i  lt  nums length  i             nums i    Double parseDouble numStrings i

User · Answer

Stored as strings   public class ReadTemps        public static void main String   args  throws IOException          TODO code application logic here            read KeyWestTemp txt         create token1     String token1               for-each loop for calculating heat index of May - October         create Scanner inFile1     Scanner inFile1   new Scanner new File  KeyWestTemp txt    useDelimiter     s             Original answer used LinkedList  but probably preferable to use ArrayList in most cases        List lt String gt  temps   new LinkedList lt String gt         List lt String gt  temps   new ArrayList lt String gt             while loop     while  inFile1 hasNext               find next line       token1   inFile1 next          temps add token1             inFile1 close         String   tempsArray   temps toArray new String 0         for  String s   tempsArray          System out println s                 For floats   import java io File  import java io IOException  import java util LinkedList  import java util List  import java util Scanner   public class ReadTemps      public static void main String   args  throws IOException          TODO code application logic here            read KeyWestTemp txt         create token1         for-each loop for calculating heat index of May - October         create Scanner inFile1     Scanner inFile1   new Scanner new File  KeyWestTemp txt    useDelimiter     s              Original answer used LinkedList  but probably preferable to use ArrayList in most cases        List lt Float gt  temps   new LinkedList lt Float gt         List lt Float gt  temps   new ArrayList lt Float gt             while loop     while  inFile1 hasNext               find next line       float token1   inFile1 nextFloat          temps add token1             inFile1 close         Float   tempsArray   temps toArray new Float 0         for  Float s   tempsArray          System out println s

User · Answer

int count   -1  String   content   new String 200   while inFile1 hasNext          content   count    inFile1 nextLine        EDIT  Looks like you want to create a float array  for that create a float array  int count   -1  Float   content   new Float 200   while inFile1 hasNext          content   count    Float parseFloat inFile1 nextLine         then your float array would look like  content 0    70 3 content 1    70 8 content 2    73 8 content 3    77 0 and so on

User · Answer

Just read the whole file into a StringBuilder  then split the String by dot following a space  You will get a String array   Scanner inFile1   new Scanner new File  KeyWestTemp txt      StringBuilder sb   new Stringbuilder    while inFile1 hasNext          sb append inFile1 nextLine        String   yourArray   sb toString   split

User · Answer

I use this method   import java util Scanner  import java io File  import java io FileNotFoundException   public class TEST       static Scanner scn   public static void main String   args        String text            try          scn   new Scanner new File  test txt          catch FileNotFoundException ex  System out println ex getMessage          while scn hasNext             text    scn next                      String   arry   text split              if need converting to float do this      Float   arrdy   new Float arry length       for int i   0  i  lt  arry length  i                 arrdy i    Float parseFloat arry i                  System out println Arrays toString arrdy

User · Answer

I have found this way of reading strings from files to work best for me  String st  full  full     BufferedReader br   new BufferedReader new FileReader URL    while   st br readLine     null        full  st       full  will be the completed combination of all of the lines  If you want to add a line break between the lines of text you would do full  st   n

[java] Java read file and store text in an array

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