Java-Programming/assignment2/src/assignment2/StringHandle.java at main · jake1412/Java-Programming · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
/*
Jacob John
*/

package assignment2;

import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Coefficient {
    public static String extractCoefficient(String str) {
        String pattern = "^\\d";

        // Create a Pattern object
        Pattern r = Pattern.compile(pattern);

        // Now create matcher object.
        Matcher m = r.matcher(str);
        if (m.find()) {
            return m.group(0);
        } else {
            return "1";
        }
    }

    public static String removeCoefficient(String str) {
        String pattern = "[^\\d](.*)";

        // Create a Pattern object
        Pattern r = Pattern.compile(pattern);

        // Now create matcher object.
        Matcher m = r.matcher(str);
        if (m.find()) {
            return m.group(0);
        } else {
            return str;
        }
    }
}

public class StringHandle {
    public static void main(String args[]) {
        int i;
        // get input
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter equation: ");
        String eq = sc.nextLine();
        sc.close();

        // define re for splits
        String arrow = "(\\s->\\s)|(\\s->)|(->\\s)|(->)";

        // split into reactants and products
        String[] words = eq.split(arrow);
        String[] reactant = words[0].split("\\+");
        String[] product = words[1].split("\\+");

        String[] rmoles = new String[10];
        String[] pmoles = new String[10];

        for (i = 0; i < reactant.length; i++) {
            reactant[i] = reactant[i].replaceAll("\\s+", "");
            rmoles[i] = Coefficient.extractCoefficient(reactant[i]);
        }

        for (i = 0; i < product.length; i++) {
            product[i] = product[i].replaceAll("\\s+", "");
            pmoles[i] = Coefficient.extractCoefficient(product[i]);
        }

        System.out.print("(1) Reactants are ");
        if (reactant.length > 1) {
            for (i = 0; i < reactant.length; i++) {
                if (i == 0)
                    System.out.print(rmoles[i] + " mole/s of " + Coefficient.removeCoefficient(reactant[i]));
                else if (i == reactant.length - 1)
                    System.out.print(" and " + rmoles[i] + " mole/s of "
                            + Coefficient.removeCoefficient(reactant[i]));
                else
                    System.out.print(", " + rmoles[i] + " mole/s of " + Coefficient.removeCoefficient(reactant[i]));
            }
        } else {
            System.out.print(rmoles[0] + " mole/s of "
                    + Coefficient.removeCoefficient(reactant[0]));
        }
        System.out.println();
        System.out.print("(2) Products are ");
        if (product.length > 1) {
            for (i = 0; i < product.length; i++) {
                if (i == 0)
                    System.out.print(pmoles[i] + " mole/s of " + Coefficient.removeCoefficient(product[i]));
                else if (i == product.length - 1)
                    System.out.print(" and " + pmoles[i] + " mole/s of " + Coefficient.removeCoefficient(product[i]));
                else
                    System.out.print(", " + pmoles[i] + " mole/s of " + Coefficient.removeCoefficient(product[i]));
            }
        } else {
            System.out.print(pmoles[0] + " mole/s of " + Coefficient.removeCoefficient(product[0]));
        }
    }
}