Array Assignment

package javaapplication8;

import java.util.Scanner;

public class JavaApplication8 {

    static Scanner sc = new Scanner (System.in);

    public static void main(String[] args) {
        System.out.print("Enter a sentence: ");
        System.out.println ("");


        //Code works completely fine other than the counter not accumulating the first line of words.


        String accum = new String()   ;

        String input = sc.nextLine() ;


        while (input!=null) {
            if (input.isEmpty()){
                System.out.println("Read Enter Key.");
                break;
            } else if (sc.hasNextLine()){
                input = sc.nextLine();
            } else {
                input = null;
            }
        accum += input;
        }

        String sentence = accum.replaceAll("\\W", "");
        sentence = sentence.toUpperCase();

        int [] frequencies = new int [26];
        int value = 65;
        double valuecount = 0;

        for (int i = 0; i < 26 ; i++) {
            for (int i2 = 0; i2 < sentence.length(); i2++){
                if (sentence.charAt(i2) == value){
                    valuecount += 1 ;
                }
            }
            double percent = (valuecount / sentence.length() ) * 100;
            char val = (char) value;
            System.out.format (val + " occured %.2f percent of the time. \n", + percent);
            value += 1;
            valuecount =0 ;
        }
    }
}