Question

I need help parsing a large text file in order to create a map using Java. I have a text file named weather_report.txt which is filled with hundreds of different indexes. For example: one line is "POMONA SUNNY 49 29 46 NE3 30.46F". There are a few hundred more indexes like that line with different values in the text file and they are not delimited by commas but instead by spaces. Therefore, in this list of indexes we only care about the location (Pomona) and the temperature (30.46F). All the other information in this index (Sunny 49 29 46 NE3) are irrelevant.

I need to print out the pairs of location and temperature so that the lowest temperature values are sorted first and that the results are outputted via PrintStream function as an external txt file named weatheroutput.txt. How would this be coded in Java?

Answer 1

Hi,

I am not able to paste the code. showing some loading error.

Please see the screenshots of code.

import java.io.BufferedReader import java.io.FileReader: import java.io. IOException; public class Weather static String [ locationArray new String [3] static String [] tempArray = new String [3]; public static void main (String[ll args) //Reading the data from the file BufferedReader br null: FileReader fr- null; try fr - new FileReader ("weather_report.txt") br - new BufferedReader (fr); String [ values String sLine: while ((sLine-br.readLine )) !- null) values = 3Li ne·split (" " ) ; locationArray[ivalues [0]: tempArrayli] values [61: catch (IOException e) e.printStackTrace) sortArray); for (int j-0:j<locationArray.length:j+) System.out.println ("Location: "+locationArraytl+ " Temperature: " tempArray])

//To sort array public static void sortArray) i for (int į = 0; ǐ < tempArray. length; 1++) { for (int j = 1 + 1; j < tempArray.length; j++) { String temp ""; String tempLoc '' '' ; double tempArray_i_Val Double.valueOf ( (tempArrayti] ).replaceAll("F", "")) .doubleValue ); double tempArray_1-Val-Double . valueOf ( (tempArray[j] ).replaceAll("F", "")).doublevalue(); if (tempArray_i_Val > tempArray_j_Val) temp = tempArray[1]; tempLoc locationArray[1] ; tempArray[i] -tempArray[j]: locationArray[i] locationArray[5 tempArray[j] = temp ; locationArray[j] tempLoc; weather report.txt POMONA SUNNY 49 29 46 NE3 30.46F ILLIONOIS SUNNY 49 29 46 NE3 5.46F FLORIDA SUNNY 49 29 46 NE3 17.46F sample output: Location ILLIONOIS Temperature: 5.46F Location FLORIDA Temperature: 17.46F