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src/main/java/io/zipcoder/Problem6.java

@@ -1,4 +1,58 @@
 package io.zipcoder;
 
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
 public class Problem6 {
+    //Step 1: convert given 12 hour numerical format into 24 hours format
+    //use SimpleDateFormat to format input to 24 hours
+
+    String[] units = {"Zero", "One", "Two", "Three", "Four",
+            "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen",
+            "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
+    String[] tens = {"", "", "Twenty", "Thirty", "Forty", "Fifty"};
+    public String convertTo24Hours(String input) {
+        SimpleDateFormat displayFormat = new SimpleDateFormat("HH:mm");
+        SimpleDateFormat parseFormat = new SimpleDateFormat("hh:mm a");
+        Date date = null;
+        try {
+            date = parseFormat.parse(input);
+        } catch (ParseException e) {
+            e.printStackTrace();
+        }
+        return displayFormat.format(date);
+    }
+
+    //Step 2: convert the 24 hour format into military time phrase in string format
+    //after the first two digit, add "Hundred and" to the end
+    //add Hours at the end of each string
+    public String convertToMilitaryTime(String input){
+        String formattedInput = convertTo24Hours(input);
+        String[] time= formattedInput.split(":");
+        String hour = convertToWords(time[0]);
+        String minute=convertToWords(time[1]);
+        return hour + " Hundred and " + minute + " Hours";
+
+
+    }
+    public String convertToWords(String input){
+        int num = Integer.parseInt(input);
+        String word="";
+        if(num<10){
+            word+=units[0]+" "+units[num];
+        }
+        if(num<20 && num>=10){
+            word+=units[num];
+        }
+        if(num>=20){
+            if(num%10==0){
+                word+=tens[num/10];
+            }
+            else {
+                word += tens[num / 10] + " " + units[num % 10];
+            }
+        }
+        return word;
+    }
 }

src/test/java/io/zipcoder/Problem6Test.java

@@ -1,4 +1,41 @@
 package io.zipcoder;
 
+import org.junit.Assert;
+import org.junit.Test;
+
 public class Problem6Test {
+    Problem6 problem6 = new Problem6();
+    @Test
+    public void testConvertTo24Hours(){
+        String expected= "14:30";
+        String actual = problem6.convertTo24Hours("2:30 pm");
+        Assert.assertEquals(expected,actual);
+        System.out.println(actual);
+    }
+    //output should Fourteen Hundred and Thirty Hours
+    @Test
+    public void testConvert() {
+        String expected = "Fourteen Hundred and Thirty Hours";
+        String actual = problem6.convertToMilitaryTime("2:30 pm");
+        Assert.assertEquals(expected, actual);
+    }
+    @Test
+    public void testConvert2(){
+        String expected="Fourteen Hundred and Zero Hours";
+        String actual = problem6.convertToMilitaryTime("2:00 pm");
+        Assert.assertEquals(expected,actual);
+        System.out.println(actual);
+    }
+    @Test
+    public void testConvertTo24Hours2(){
+        String expected = "09:00";
+        String actual = problem6.convertTo24Hours("9:00 am");
+        Assert.assertEquals(expected,actual);
+    }
+    @Test
+    public void testConvert3(){
+        String expected ="Zero Two Hundred and Eleven Hours";
+        String actual = problem6.convertToMilitaryTime("2:11 am");
+        Assert.assertEquals(expected,actual);
+    }
 }