diff --git a/CS207-2-HW4.pdf b/CS207-2-HW4.pdf
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diff --git a/TestLargeDecimals.java b/TestLargeDecimals.java
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+/* 
+ * NEIU CS207-2 Fall 2018  
+ * Homework 4 TestLargeDecimals.java
+ * This is the class with a main(), to test LargeDecimals
+ */
+import java.math.BigDecimal;
+public class TestLargeDecimals
+{
+   public static void main( String[] args )
+   {
+      LargeDecimals decimals = new LargeDecimals();
+      BigDecimal maxOfMins;
+   
+      // First 2D test array of type BigDecimal
+      BigDecimal[][] numbers1 = {
+      { new BigDecimal("50.0"), new BigDecimal("20.0"), new BigDecimal("80.0"), new BigDecimal("90.0"), new BigDecimal("100.0") },
+      { new BigDecimal("77.0"), new BigDecimal("555.0"), new BigDecimal("33.0"), new BigDecimal("44.0"), new BigDecimal("66.0") },
+      { new BigDecimal("888.0"), new BigDecimal("15.0"), new BigDecimal("302.0"), new BigDecimal("90.0"), new BigDecimal("123.0") },
+      { new BigDecimal("31.0"), new BigDecimal("29.0"), new BigDecimal("30.0"), new BigDecimal("32.0"), new BigDecimal("28.0") }
+      };
+      
+      // Call the maxOfMin() behavior passing it the 2D array
+      maxOfMins = decimals.maxOfMins( numbers1 );
+      
+      System.out.println( "The max of the mins in numbers1 is: " + maxOfMins );
+      
+      // Second 2D test array of type BigDecimal
+      BigDecimal[][] numbers2 = {
+      { new BigDecimal("-96.0"), new BigDecimal("-41.0"), new BigDecimal("-78.0"), new BigDecimal("12.0"), new BigDecimal("8.0") },
+      { new BigDecimal("0.0"), new BigDecimal("-1.0"), new BigDecimal("18.0"), new BigDecimal("-12.0"), new BigDecimal("-48.0") },
+      { new BigDecimal("-0.8"), new BigDecimal("1.0"), new BigDecimal("-84.0"), new BigDecimal("-16.0"), new BigDecimal("3.0") },
+      { new BigDecimal("6.0"), new BigDecimal("14.0"), new BigDecimal("-14.0"), new BigDecimal("-8.0"), new BigDecimal("-3.0") }
+      };      
+      
+      maxOfMins = decimals.maxOfMins( numbers2 );
+      System.out.println( "The max of the mins in numbers2 is: " + maxOfMins );
+      
+   } // End main()
+
+} // End class TestLargeDecimals
diff --git a/TestLargeIntegers.java b/TestLargeIntegers.java
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+++ b/TestLargeIntegers.java
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+/* 
+ * NEIU CS207-2 Fall 2018  
+ * Homework 4 TestLargeIntegers.java
+ * This is the class with a main(), to test LargeIntegers
+ */
+import java.math.BigInteger;
+public class TestLargeIntegers
+{
+   public static void main( String[] args )
+   {
+      LargeIntegers numbers = new LargeIntegers();
+      
+      // First test case
+      BigInteger a = new BigInteger("13");
+      BigInteger b = new BigInteger("42");
+      BigInteger c = new BigInteger("101");
+      
+      numbers.oneOfThree( a, b, c );
+      
+      // Second test case
+      BigInteger d = new BigInteger("13");
+      BigInteger e = new BigInteger("7");
+      BigInteger f = new BigInteger("5"); 
+      
+      numbers.oneOfThree( d, e, f );
+     
+      // Third test case
+      BigInteger g = new BigInteger("50");
+      BigInteger h = new BigInteger("70");
+      BigInteger i = new BigInteger("6");
+      
+      numbers.oneOfThree( g, h, i );
+    
+      // Fourth test case
+      BigInteger j = new BigInteger("1000");
+      BigInteger k = new BigInteger("600");
+      BigInteger l = new BigInteger("88");
+      
+      numbers.oneOfThree( j, k, l);
+      
+      // Fifth test case
+      BigInteger m = new BigInteger("10");
+      BigInteger n = new BigInteger("10");
+      BigInteger o = new BigInteger("9");
+      
+      numbers.oneOfThree( m, n, o );
+      
+      // Sixth test case
+      BigInteger p = new BigInteger("5");
+      BigInteger q = new BigInteger("5");
+      BigInteger r = new BigInteger("10");    
+      
+      numbers.oneOfThree( p, q, r );
+                           
+   } // End main()
+
+} // End class TestLargeIntegers
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diff --git a/TestStringPractice.java b/TestStringPractice.java
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+/* 
+ * NEIU CS207-2 Fall 2018  
+ * Homework 4 TestStringPractice.java
+ * This is the class with a main(), to test StringPractice
+ */
+public class TestStringPractice
+{
+   public static void main(String[] args)
+   {
+      StringPractice s1 = new StringPractice("Hello world, welcome to the Java world.");
+      
+      /*
+      System.out.println(s1.makeSubstring(0));
+      System.out.println(s1.makeSubstring(6));
+      System.out.println(s1.makeSubstring(6, 14));
+      System.out.println(s1.makeSubstring(13));
+      System.out.println(s1.makeSubstring(0, 12));
+      System.out.println();
+      */
+
+      /*
+      System.out.println(s1.findIndexOf('w'));
+      System.out.println(s1.findIndexOf('m'));
+      System.out.println(s1.findIndexOf('x'));
+      System.out.println(s1.findIndexOf('J'));
+      System.out.println(s1.findIndexOf('a'));
+      System.out.println();
+      */
+
+      /*
+      System.out.println(s1.findIndexOf('w', 7));
+      System.out.println(s1.findIndexOf('m', 20));
+      System.out.println(s1.findIndexOf('x', 10));
+      System.out.println(s1.findIndexOf('J', 30));
+      System.out.println(s1.findIndexOf('a', 30));
+      System.out.println();
+      */
+
+      /*
+      System.out.println(s1.findIndexOf("wo"));
+      System.out.println(s1.findIndexOf("we"));
+      System.out.println(s1.findIndexOf("He"));
+      System.out.println(s1.findIndexOf("Ja"));
+      System.out.println(s1.findIndexOf("va"));
+      System.out.println();
+      */
+
+      /*
+      System.out.println(s1.findIndexOf("wo", 7));
+      System.out.println(s1.findIndexOf("we", 20));
+      System.out.println(s1.findIndexOf("He", 10));
+      System.out.println(s1.findIndexOf("Ja", 30));
+      System.out.println(s1.findIndexOf("va", 25));
+      System.out.println();
+      */
+      
+   } // End main() 
+   
+} // End class TestStringPractice
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