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mahindar
read from file and store using hash map
1 Answer(s)      2 years ago
Posted in : Java Beginners


I was stuck with a java project where I have to read a file with two different concepts and store them differently in hashmap. My data file would be something like

Adults:

Name, xyz (Key, value)
ID, 123 (key, value)

Children:

Name, abc
ID, 321 and so on........

Here two concepts adults and children in file should be stored in two different maps. Any help will be appreciated. Thanks in advance.


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July 25, 2012 at 12:30 PM


Here is a simple example of storing the text file data into HashMap.

import java.io.*;
import java.util.*;
class OnlyExt implements FilenameFilter{
  String ext;
  public OnlyExt(String ext){
  this.ext="." + ext;
  }
  public boolean accept(File dir,String name){
  return name.endsWith(ext);
  }
}
class MapExample{
    public static void main(String[] args)throws Exception{
        FilenameFilter ff = new OnlyExt("txt");
        File folder = new File("c:/");
        File[] files = folder.listFiles(ff);
        Map<String,String> map=new LinkedHashMap<String,String>();
        for(int i=0;i<files.length;i++){
        FileReader fr = new FileReader(files[i].getPath());
            BufferedReader reader = new BufferedReader(fr);
            String st = "",str=" ";
            while((st = reader.readLine()) != null) {
        str+=st;
        }
        map.put(files[i].getName(),str);
        }
        Set set = map.entrySet();
        Iterator i = set.iterator();
        while(i.hasNext()){
        Map.Entry me = (Map.Entry)i.next();
        System.out.println(me.getKey() + " \t:\t " + me.getValue());
    }
  }
}


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