BAEL-9425 Storing X and Y Coordinates in Java (#18766)

* Create XYCoordinatesUnitTest.java

* Update and rename XYCoordinatesUnitTest.java to XYCoordinatesUnitTest.java

* Create Point.java

* Update XYCoordinatesUnitTest.java

* Create PointRecord.java

* Update XYCoordinatesUnitTest.java

* Update XYCoordinatesUnitTest.java

* Update XYCoordinatesUnitTest.java

* Rename XYCoordinatesUnitTest.java to XYCoordinatesUnitTest.java

* Rename Point.java to Point.java

* Rename PointRecord.java to PointRecord.java

* Update XYCoordinatesUnitTest.java

* Update Point.java

* Update PointRecord.java

* Update XYCoordinatesUnitTest.java

* Update XYCoordinatesUnitTest.java

Author: Deepak-Vohra

core-java-modules/core-java-lang-math-5/src/main/java/com/baeldung/storingXYcoordinates/Point.java

@@ -0,0 +1,43 @@
+package com.baeldung.storingXYcoordinates;
+
+import java.util.Objects;
+
+public class Point {
+    private final double x;
+    private final double y;
+
+    public Point(double x, double y) {
+        this.x = x;
+        this.y = y;
+    }
+
+    public double getX() {
+        return x;
+    }
+
+    public double getY() {
+        return y;
+    }
+
+    @Override
+    public String toString() {
+        return "Point{" +
+                "x=" + x +
+                ", y=" + y +
+                '}';
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Point point = (Point) o;
+        return Double.compare(point.x, x) == 0 &&
+               Double.compare(point.y, y) == 0;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(x, y);
+    }
+}

core-java-modules/core-java-lang-math-5/src/main/java/com/baeldung/storingXYcoordinates/PointRecord.java

@@ -0,0 +1,5 @@
+package com.baeldung.storingXYcoordinates;
+
+public record PointRecord(double x, double y) {
+}
+

core-java-modules/core-java-lang-math-5/src/test/java/com/baeldung/storingXYcoordinates/XYCoordinatesUnitTest.java

@@ -0,0 +1,84 @@
+package com.baeldung.storingXYcoordinates;
+
+import org.junit.jupiter.api.Test;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import java.awt.geom.Point2D;
+
+class XYCoordinatesUnitTest {
+
+    @Test
+    void givenAPoint_whenUsingGetter_thenPointReturnsCoordinatesCorrectly() {
+        // Given a point with coordinates (10.0, 20.5)
+        Point point = new Point(10.0, 20.5);
+
+        // Then its getters should return the correct values
+        assertEquals(10.0, point.getX(), "X coordinate should be 10.0");
+        assertEquals(20.5, point.getY(), "Y coordinate should be 20.5");
+    }
+  
+    @Test
+    void givenTwoPointsWithSameCoordinates_whenComparedForEquality_thenShouldBeEqual() {
+        Point point1 = new Point(5.1, -3.5);
+        Point point2 = new Point(5.1, -3.5);
+        
+        assertEquals(point1, point2, "Points with same coordinates should be equal");
+    }
+
+    @Test
+    void givenAPointRecord_whenUsingAccessorMethods_thenRecordReturnsCoordinatesCorrectly() {
+        // Given a record with coordinates (30.5, 40.0)
+        PointRecord point = new PointRecord(30.5, 40.0);
+
+        // Then its accessor methods should return the correct values
+        assertEquals(30.5, point.x(), "X coordinate should be 30.5");
+        assertEquals(40.0, point.y(), "Y coordinate should be 40.0");
+    }
+
+    @Test
+    void givenTwoRecordsWithSameCoordinates_whenComparedForEquality_thenShouldBeEqual() {
+        PointRecord point1 = new PointRecord(7.0, 8.5);
+        PointRecord point2 = new PointRecord(7.0, 8.5);
+
+        assertEquals(point1, point2, "Records with same coordinates should be equal");
+    }
+    
+    @Test
+    void givenAnAWTPoint_whenAccessingItsFieldsAndGetters_thenReturnsCoordinatesCorrectly() {
+        // Given an AWT Point
+        Point2D.Double point = new Point2D.Double(10.5, 20.5);
+
+        // Then its public fields should hold the correct values
+        assertEquals(10.5, point.x);
+        assertEquals(20.5, point.y);
+
+        // And its getters should also work
+        assertEquals(10.5, point.getX());
+        assertEquals(20.5, point.getY());
+    }
+
+    @Test
+    void givenAnAWTPointForIntegerCoordinates_whenAccessingItsFieldsAndGetters_thenReturnsCoordinatesCorrectly() {
+        // Given an AWT Point
+        java.awt.Point point = new java.awt.Point(50, 60);
+
+        // Then its public fields should hold the correct values
+        assertEquals(50, point.x);
+        assertEquals(60, point.y);
+
+        // And its getters should also work
+        assertEquals(50, point.getX());
+        assertEquals(60, point.getY());
+    }
+    
+    @Test
+    void givenArrayOfCoordinates_whenAccessingArrayIndices_thenReturnsCoordinatesAtCorrectIndices() {
+        // Given an array representing coordinates (15.0, 25.0)
+        double[] coordinates = new double[2];
+        coordinates[0] = 15.0; // X
+        coordinates[1] = 25.0; // Y
+
+        // Then index 0 should be X and index 1 should be Y
+        assertEquals(15.0, coordinates[0], "Index 0 should be the X coordinate");
+        assertEquals(25.0, coordinates[1], "Index 1 should be the Y coordinate");
+    }
+}