BAEL-2995 - possible lossy conversion

java-numbers/src/test/java/com/baeldung/lossyconversion/ConversionTechniquesUnitTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.lossyconversion;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.jupiter.api.Test;
+
+public class ConversionTechniquesUnitTest {
+
+    @Test
+    public void testPrimitiveConversion() {
+
+        double doubleNum = 15.6;
+        int integerNum = (int) doubleNum;
+
+        assertEquals(integerNum, 15);
+    }
+
+    @Test
+    public void testWrapperConversion() {
+
+        Double doubleNum = 10.3;
+        double dbl = doubleNum.doubleValue();
+        int intgr = (int) dbl;
+        Integer intNum = Integer.valueOf(intgr);
+
+        assertTrue(intNum == 10);
+    }
+
+    @Test
+    public void testWrapperToPrimitiveConversion() {
+
+        Float floatNum = 17.564f;
+        long longNum = floatNum.longValue();
+
+        assertEquals(longNum, 17l);
+
+        Double doubleNum = 15.9999;
+        int intNum = doubleNum.intValue();
+
+        assertEquals(intNum, 15);
+
+        longNum = Math.round(doubleNum);
+
+        assertEquals(longNum, 16);
+    }
+
+    @Test
+    public void testWrapperToPrimitiveConversionUsingMathRound() {
+
+        Double doubleNum = 15.9999;
+        long longNum = Math.round(doubleNum);
+
+        assertEquals(longNum, 16);
+    }
+}