arthurshur

core-java-modules/core-java-8-2/src/main/java/com/baeldung/helpervsutilityclasses/MyHelperClass.java

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+package com.baeldung.helpervsutilityclasses;
+
+class MyHelperClass {
+    public double discount;
+    public MyHelperClass(double discount) {
+        if (discount > 0 && discount < 1) {
+            this.discount = discount;
+        }
+    }
+    public double discountedPrice(double price) {
+        return price - (price * discount);
+    }
+
+    public static int getMaxNumber(int[] numbers) {
+        if (numbers.length == 0) {
+            throw new IllegalArgumentException("Ensure array is not empty");
+        }
+        int max = numbers[0];
+        for (int i = 1; i < numbers.length; i++) {
+            if (numbers[i] > max) {
+                max = numbers[i];
+            }
+        }
+        return max;
+    }
+
+    public static int getMinNumber(int[] numbers) {
+        if (numbers.length == 0) {
+            throw new IllegalArgumentException("Ensure array is not empty");
+        }
+        int min = numbers[0];
+        for (int i = 1; i < numbers.length; i++) {
+            if (numbers[i] < min) {
+                min = numbers[i];
+            }
+        }
+        return min;
+    }
+
+}

core-java-modules/core-java-8-2/src/main/java/com/baeldung/helpervsutilityclasses/MyUtilityClass.java

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+package com.baeldung.helpervsutilityclasses;
+
+public final class MyUtilityClass {
+
+    private MyUtilityClass(){}
+
+    public static String returnUpperCase(String stringInput) {
+        return stringInput.toUpperCase();
+    }
+
+    public static String returnLowerCase(String stringInput) {
+        return stringInput.toLowerCase();
+    }
+
+    public static String[] splitStringInput(String stringInput, String delimiter) {
+        return stringInput.split(delimiter);
+    }
+
+}

core-java-modules/core-java-8-2/src/test/java/com/baeldung/helpervsutilityclasses/MyHelperClassUnitTest.java

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+package com.baeldung.helpervsutilityclasses;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class MyHelperClassUnitTest {
+
+    @Test
+    void whenCreatingHelperObject_thenHelperObjectShouldBeCreated() {
+        MyHelperClass myHelperClassObject = new MyHelperClass(0.10);
+        int[] numberArray = {15, 23, 66, 3, 51, 79};
+
+        assertNotNull(myHelperClassObject);
+
+        assertEquals(90, myHelperClassObject.discountedPrice(100.00));
+        assertEquals( 79, MyHelperClass.getMaxNumber(numberArray));
+        assertEquals(3, MyHelperClass.getMinNumber(numberArray));
+    }
+}

core-java-modules/core-java-8-2/src/test/java/com/baeldung/helpervsutilityclasses/MyUtilityClassUnitTest.java

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+package com.baeldung.helpervsutilityclasses;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+class MyUtilityClassUnitTest {
+
+    @Test
+    void whenUsingUtilityMethods_thenAccessMethodsViaClassName(){
+        assertEquals( "INIUBONG", MyUtilityClass.returnUpperCase("iniubong"));
+        assertEquals("accra", MyUtilityClass.returnLowerCase("AcCrA"));
+    }
+
+}