First_Project/Follow at master · TamsilAmani/First_Project · GitHub

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import java.io.*;
import java.util.Arrays;
import java.util.LinkedHashSet;
import java.util.Set;

public class Follow {
    public static void main(String args[]) throws Exception {

        FileReader fr = new FileReader("E:\\Work\\IntelliJ Idea Projects\\src\\InputFirst");
        BufferedReader br = new BufferedReader(fr);

        int noP = Integer.parseInt(br.readLine());
        String sent[] = new String[noP];

        for (int i = 0; i < noP; i++)
            sent[i] = br.readLine();

        String out[] = new String[noP+1];
        out[noP]="~";


        for (int i = 0; i < noP; i++) {
            String s[] = sent[i].split("->");
            String right = s[0];
            String left = s[1];

            //System.out.println("----------------\n"+" s[0] = "+right+" s[1] = "+left+"\n\n");

            out[i] = right;

            boolean t = true;

            one:
            while (Character.isUpperCase(left.charAt(0)) == true) {
                t = false;
                char fchar = left.charAt(0);
                //System.out.println("fchar = "+fchar);
                String temp[];
                for (int j = 0; j < noP; j++) {
                    if (j != i) {
                        temp = sent[j].split("->");
                        if (temp[0].charAt(0) == fchar) {
                            //System.out.println("temp[0] here is : "+ temp[0]);
                            left = temp[1];
                            if (Character.isUpperCase(left.charAt(0))) {
                                //System.out.println("Jumpinh to while");
                                continue one;
                            }
                            else
                                out[i] += left.charAt(0);
                        }

                    }

                }
            }
            if (t)
                out[i] += left.charAt(0);

        }

        /*Arrays.sort(out);
        for (String x : out)
            System.out.println(x);

        System.out.println("--------------------"); */


        int strlen =0;


        boolean f = false; String temp="";
        for (int i = 0; i < noP; i++) {
            if (f == false) {
                //System.out.print(out[i].charAt(0) + " ");
                f = true;
                strlen++;
            }

            if (out[i].charAt(0) == out[i + 1].charAt(0));
                //temp += out[i].substring(1) + out[i + 1].substring(1);
            else if (out[i].charAt(0) != out[i + 1].charAt(0)) {
                //temp += out[i].substring(1);
                //System.out.print(remDup(temp) + "\n");
                //temp="";
                f = false;
            }

        }

        String fir[] = new String[strlen];
        strlen=-1;
        f = false; temp="";
        for (int i = 0; i < noP; i++) {
            if (f == false) {
                strlen++;
                fir[strlen] = out[i].charAt(0) + " ";
                f = true;
            }

            if (out[i].charAt(0) == out[i + 1].charAt(0))
                temp += out[i].substring(1) + out[i + 1].substring(1);
            else if (out[i].charAt(0) != out[i + 1].charAt(0)) {
                temp += out[i].substring(1);
                fir[strlen] = fir[strlen]+remDup(temp);
                temp="";
                f = false;
            }

        }
        System.out.println("----------------------------");
        for(String x : fir)
            System.out.println(x);

    // FOLLOW Calculations!

        for(int i=0; i<strlen; i++){
            char A = fir[i].charAt(0);
            String t[];
            for(int j=0; j<noP; j++){
                t = sent[i].split("->");
                if(t[1].indexOf('A')){


                }


            }

        }


    }

    static String remDup(String x){
        String string = x;

        char[] chars = string.toCharArray();

        Set<Character> charSet = new LinkedHashSet<Character>();
        for (char c : chars) {
            charSet.add(c);
        }

        StringBuilder sb = new StringBuilder();
        for (Character character : charSet) {
            sb.append(character);
        }

        return sb.toString();


    }
}