How to Abbreviate a Two Word Name in Java

The challenge

Write a function to convert a name into initials. This challenge strictly takes two words with one space in between them.

The output should be two capital letters with a dot separating them.

It should look like this:

Sam Harris => S.H

Patrick Feeney => P.F

The solution in Java

This is a really easy one, basically what we will do is the following:

  1. Convert our name toUpperCase so that we can just pull out the characters we want.
  2. Convert the name String into 2 separate values, stored in a names array.
  3. Return the first character of each, using charAt(0) with a dot inbetween.
public class AbbreviateTwoWords {

  public static String abbrevName(String name) {
    name = name.toUpperCase();
    
    String[] names = name.split(" ");
    
    return names[0].charAt(0)+"."+names[1].charAt(0);
  }
}

Test cases to validate our solutionn

import org.junit.Test;
import static org.junit.Assert.assertEquals;
import org.junit.runners.JUnit4;

public class SolutionTest {
 
    @Test
    public void testFixed() {
        assertEquals("S.H", AbbreviateTwoWords.abbrevName("Sam Harris"));
        assertEquals("P.F", AbbreviateTwoWords.abbrevName("Patrick Feenan"));
        assertEquals("E.C", AbbreviateTwoWords.abbrevName("Evan Cole"));
        assertEquals("P.F", AbbreviateTwoWords.abbrevName("P Favuzzi"));
        assertEquals("D.M", AbbreviateTwoWords.abbrevName("David Mendieta"));
        assertEquals("Z.K", AbbreviateTwoWords.abbrevName("Zenon Kapusta"));
        
        assertEquals("G.C", AbbreviateTwoWords.abbrevName("george clooney"));
        assertEquals("M.M", AbbreviateTwoWords.abbrevName("marky mark"));
        assertEquals("E.D", AbbreviateTwoWords.abbrevName("eliza doolittle"));
        assertEquals("R.W", AbbreviateTwoWords.abbrevName("reese witherspoon"));
    }
    
    @Test
    public void testRandom() {
      for(int i = 0; i < 200; i++){
        String testString = makeString();
        assertEquals(randomTest(testString), AbbreviateTwoWords.abbrevName(testString));
      }
    }
    
    private String makeString() {
        return makeWord(1, 20) + " " + makeWord(1, 20);
      }
    
    private String makeWord(int min, int max) {
      String word = "";
      String[] possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".split("");
      int length = (int) (Math.random() * max) + min;
    
      for(int i=0; i < length; i++) {
          int index = (int) (Math.random() * possible.length);
          word += possible[index];
      }
    
      return word;
    }
    
    private String randomTest(String name){
      String[] nameSplit = name.toUpperCase().split(" ");
      return nameSplit[0].substring(0, 1) + '.' + nameSplit[1].substring(0, 1);
    }
}
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