Java read file and store text in an array

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<String> temps = new LinkedList<String>();    List<String> temps = new ArrayList<String>();    // 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<Float> temps = new LinkedList<Float>();    List<Float> temps = new ArrayList<Float>();    // 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);    }  }}

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<String> tokens = new ArrayList<String>();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]);

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(", ");