Bael 3510-method multiple return values (#8348)

* init

* first draft

* first review round changes

* second review round

* changing arg name

core-java-modules/core-java-lang-2/src/test/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingArraysUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.methodmultiplereturnvalues;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+
+class MultipleReturnValuesUsingArraysUnitTest {
+
+    @Test
+    void whenUsingArrayOfDoubles_thenMultipleDoubleFieldsAreReturned() {
+
+        double[] coordinates = MultipleReturnValuesUsingArrays.getCoordinatesDoubleArray();
+        assertEquals(10, coordinates[0]);
+        assertEquals(12.5, coordinates[1]);
+    }
+
+    @Test
+    void whenUsingArrayOfNumbers_thenMultipleNumberFieldsAreReturned() {
+        
+        Number[] coordinates = MultipleReturnValuesUsingArrays.getCoordinatesNumberArray();
+        assertEquals(10, coordinates[0]);
+        assertEquals(12.5, coordinates[1]);
+
+    }
+    
+}

core-java-modules/core-java-lang-2/src/test/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingCollectionsUnitTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.methodmultiplereturnvalues;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+class MultipleReturnValuesUsingCollectionsUnitTest {
+
+    @Test
+    void whenUsingList_thenMultipleFieldsAreReturned() {
+        
+        List<Number> coordinates = MultipleReturnValuesUsingCollections.getCoordinatesList();
+        assertEquals(Integer.valueOf(10), coordinates.get(0));
+        assertEquals(Double.valueOf(12.5), coordinates.get(1));
+    }
+    
+    @Test
+    void whenUsingMap_thenMultipleFieldsAreReturned() {
+        
+        Map<String, Number> coordinates = MultipleReturnValuesUsingCollections.getCoordinatesMap();
+        assertEquals(Integer.valueOf(10), coordinates.get("longitude"));
+        assertEquals(Double.valueOf(12.5), coordinates.get("latitude"));
+    }
+}

core-java-modules/core-java-lang-2/src/test/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingContainerUnitTest.java

@@ -0,0 +1,17 @@
+package com.baeldung.methodmultiplereturnvalues;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import org.junit.jupiter.api.Test;
+
+class MultipleReturnValuesUsingContainerUnitTest {
+
+    @Test
+    void whenUsingContainerClass_thenMultipleFieldsAreReturned() {
+        
+        Coordinates coordinates = MultipleReturnValuesUsingContainer.getCoordinates();
+        
+        assertEquals(10, coordinates.getLongitude());
+        assertEquals(12.5, coordinates.getLatitude());
+        assertEquals("home", coordinates.getPlaceName());
+    }
+}

core-java-modules/core-java-lang-2/src/test/java/com/baeldung/methodmultiplereturnvalues/MultipleReturnValuesUsingTuplesUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.methodmultiplereturnvalues;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.jupiter.api.Test;
+
+class MultipleReturnValuesUsingTuplesUnitTest {
+
+    @Test
+    void whenUsingTuple_thenMultipleFieldsAreReturned() {
+        
+        List<Coordinates> coordinatesList = new ArrayList<>();
+        coordinatesList.add(new Coordinates(1, 1, "home"));
+        coordinatesList.add(new Coordinates(2, 2, "school"));
+        coordinatesList.add(new Coordinates(3, 3, "hotel"));
+        
+        Coordinates target = new Coordinates(5, 5, "gym");
+        
+        Tuple2<Coordinates, Double> mostDistantPoint = MultipleReturnValuesUsingTuples.getMostDistantPoint(coordinatesList, target);
+        
+        assertEquals(1, mostDistantPoint.getFirst().getLongitude());
+        assertEquals(1, mostDistantPoint.getFirst().getLatitude());
+        assertEquals("home", mostDistantPoint.getFirst().getPlaceName());
+        assertEquals(5.66, BigDecimal.valueOf(mostDistantPoint.getSecond()).setScale(2, RoundingMode.HALF_UP).doubleValue());
+        
+    }
+    
+}