Java

I want the program to be edited so that The user will manually enter a string, then the text file name, and it will then enter the string into the text file as well as the output the results.

I have already written this program that counts the number of occurences of each letter in a string. The program displays the letters in ascending order, by keys and by value. It asks for a text file, which for example, contains the lines:

Welcome to CECS

Java Programming

With this text file the output will be:

Map contains:

Sort by keys

Key Value

2 1

7 2

a 3

c 3

e 3

g 2

i 1

j 1

l 1

m 3

n 1

o 3

p 1

r 2

s 1

t 1

v 1

w 1

Sort by values

Key Value

o 3

m 3

e 3

c 3

a 3

7 2

r 2

g 2

w 1

v 1

t 1

s 1

2 1

p 1

n 1

l 1

j 1

i 1

THis is what I have so far:

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Collections;

import java.util.Comparator;

import java.util.HashMap;

import java.util.Iterator;

import java.util.LinkedList;

import java.util.List;

import java.util.Map;

import java.util.Scanner;

import java.util.TreeMap;

import java.util.Map.Entry;

public class MapSorting {

private static Scanner read;

public static void sortByKey(Map map) {

System.out.println("Sort by keys");

System.out.println("Key\tValue");

Map tree = new TreeMap(map);

Iterator> itr = tree.entrySet().iterator();

while(itr.hasNext()) {

Entry entry = itr.next();

System.out.println(entry.getKey()+"\t"+entry.getValue());

}

}

public static void sortByValue(Map map) {

System.out.println("Sort by values");

System.out.println("Key\tValue");

List> list = new LinkedList>(map.entrySet());

Comparator> comparator = new Comparator>() {

public int compare(Entry object1, Entry object2) {

return object1.getValue().compareTo(object2.getValue());

}

};

Collections.sort(list, comparator);

for(int i=list.size()-1;i>=0;i--) {

Entry entry = list.get(i);

System.out.println(entry.getKey()+"\t"+entry.getValue());

}

}

public static void main(String[] args) throws FileNotFoundException {

Scanner scanner = new Scanner(System.in);

System.out.println("Enter the text file to read from:");

String fileName = scanner.nextLine();

File file = new File(fileName);

if(file.exists()) {

read = new Scanner(file);

String line = "";

while(read.hasNextLine()) {

line = line + read.nextLine().toLowerCase();

}

char c;

Map map = new HashMap();

for(int i=0;i

c = line.charAt(i);

if(c==' ') {

continue;

}

if(map.containsKey(c)) {

map.put(c, map.get(c)+1);

}else {

map.put(c, 1);

}

}

System.out.println("Map contains:");

sortByKey(map);

sortByValue(map);

scanner.close();

} else {

System.out.println("File does not exist");

}

}

}