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a guest Feb 17th, 2019 66 Never
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  1. public interface MyCustomStringInterface {
  2.     int countNumbers();
  3. }
  4.  
  5. public class MyCustomString implements MyCustomStringInterface {
  6.     private String string;
  7.  
  8.  
  9.  
  10.     @Override
  11.     public int countNumbers() {
  12.         while (string.length() != 0 ) {
  13.             int count = 0;
  14.             for (int i = 0; i < string.length(); i++) {
  15.                 if(Character.isDigit(string.charAt(i))) count++;
  16.             }
  17.             return count;
  18.         }
  19.         return 0;
  20. }
  21.  
  22. public class MyCustomStringTest {
  23.     private MyCustomStringInterface mycustomstring;
  24.  
  25.     @Test
  26.     public void testCountNumbers1() {
  27.        mycustomstring.setString("th1s strin8 shou1d hav3 numb3rs,
  28.        righ7?");
  29.  
  30.        assertEquals(6, mycustomstring.countNumbers());
  31.     }  
  32. }
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