Question

Write a console program in Java that allows the user to specify a text file, opens the file, and prints a two-column table consisting of all the words in the file together with the number of times that each word appears. Words are space-delimited and case-sensitive. The table should list the words in alphabetical order. Proper code documentation should be included in the source code.

Answer 1

package myPackage;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.TreeMap;

import javax.swing.*;
class MyClass {
public static void main(String[] args) throws IOException {
     
   String filename;
   System.out.println("enter file name:");
   Scanner s = new Scanner(System.in);
   filename=s.nextLine();
   System.out.println(filename);
   FileReader fr=new FileReader(filename);
   BufferedReader br=new BufferedReader(fr);
   ArrayList<String> list=new ArrayList<String>();
   int i;
   StringBuffer stringBuffer=new StringBuffer();
while((i=br.read())!=-1){
stringBuffer.append((char)i);
if((char)i==' ')
{
   list.add(stringBuffer.toString());
   stringBuffer.delete(0, stringBuffer.length());
}
}
list.add(stringBuffer.toString());
Map<String, Long> counts =new HashMap<>();
for( String a: list) {
   if(counts.containsKey(a)) {
       counts.put(a, counts.get(a)+1);
   }
   else{ counts.put(a, 1L); }
   }
Map<String, Long> treeMap = new TreeMap<String, Long>(counts);
br.close();
fr.close();
s.close();
System.out.println(treeMap);
JFrame f;   
f=new JFrame();   
String[][] array = new String[treeMap.size()][2];
int count = 0;
for(Map.Entry<String,Long> entry : treeMap.entrySet()){
array[count][0] = entry.getKey();
array[count][1] = entry.getValue().toString();
count++;
}
String column[]={"words","count"};

JTable jt=new JTable(array,column) ;
jt.setBounds(30,40,200,300);
JScrollPane sp=new JScrollPane(jt);
f.add(sp);
f.setSize(300,400);
f.setVisible(true);
   }
}
//output:

enter file name:
"C:\\Users\\sai.reddy\\Desktop\\IrisData.txt"
"C:\\Users\\sai.reddy\\Desktop\\IrisData.txt"
{Java =1, Proper =1, The =1, Words =1, Write =1, a =3, all =1, allows =1, alphabetical =1, and =2, appears =1, are =1, be =1, case-sensitive =1, code=1, code =1, consisting =1, console =1, documentation =1, each =1, file =3, in =4, included =1, list =1, number =1, of =2, opens =1, order =1, prints =1, program =1, should =2, source =1, space-delimited =1, specify =1, table =2, text =1, that =2, the =7, times =1, to =1, together =1, two-column =1, user =1, with =1, word =1, words =2}