number to words java solo

1
2public class Main {
3
4    public static void main(String[] args) {
5        System.out.println(reverse(1000));
6        System.out.println(reverse(-2));
7        System.out.println(getDigitCount(4567));
8        numberToWords(1000);
9        numberToWords(-12);
10        numberToWords(123);
11	// write your code here
12    }
13    public static void numberToWords(int number){
14        String numString=""; // initialising an empty string
15        if(number<0){
16            System.out.println("Invalid Value");
17        }
18        int numDigits=getDigitCount(number); //calling getDigitCount() method
19        int reverseNum=reverse(number); // calling reverse() method
20        int testNum=0;
21        while (numDigits>0){
22            testNum=reverseNum%10;
23            reverseNum/=10;
24            numDigits-=1;
25            if(testNum==0){
26                numString+="Zero ";
27            }
28            else{
29                switch(testNum){
30                    case 1:
31                        numString += "One ";
32                        break;
33                    case 2:
34                        numString += "Two ";
35                        break;
36                    case 3:
37                        numString += "Three ";
38                        break;
39                    case 4:
40                        numString += "Four ";
41                        break;
42                    case 5:
43                        numString += "Five ";
44                        break;
45                    case 6:
46                        numString += "Six ";
47                        break;
48                    case 7:
49                        numString += "Seven ";
50                        break;
51                    case 8:
52                        numString += "Eight ";
53                        break;
54                    case 9:
55                        numString += "Nine ";
56                        break;
57
58                }
59            }
60        }
61        System.out.println(numString);
62        
63    }
64
65    public static int reverse(int number){
66        int reverseNum=0;
67
68        while(number!=0){
69            int lastDigit=number%10;
70            reverseNum=(reverseNum*10)+lastDigit;
71            number=number/10;
72        }
73        return reverseNum;
74    }
75
76
77    public static int getDigitCount(int number){
78        int digit=0;
79        if(number<0){
80            return -1;
81        }
82        if(number==0){
83            digit=1;
84        }
85        while(number>0){
86            number=number/10;
87            digit+=1;
88        }
89        return digit;
90    }
91}