[bigdecimal-zero] bigdecimal zero vs constructor (#15355)

core-java-modules/core-java-numbers-7/src/test/java/com/baeldung/bigdecimalzero/BigDecimalZeroVsNewBigDecimalUnitTest.java

@@ -0,0 +1,39 @@
+package com.baeldung.bigdecimalzero;
+
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class BigDecimalZeroVsNewBigDecimalUnitTest {
+    @Test
+    void whenComparingZeroAndNewBigDecimal_thenGetExpectedResult() {
+        BigDecimal bd1 = new BigDecimal("42.00");
+        BigDecimal bd2 = new BigDecimal("42.0000");
+        assertEquals(0, bd1.compareTo(bd2));
+
+        assertNotEquals(bd1, bd2);
+
+        BigDecimal zero0 = new BigDecimal(0);
+        assertNotEquals(zero0, new BigDecimal("0.000"));
+
+        BigDecimal zero = BigDecimal.ZERO;
+        assertEquals(zero, zero0);
+    }
+
+    @Test
+    void whenCallingBigDecimalZero_thenAlwaysGetTheSameObject() {
+        BigDecimal z1 = BigDecimal.ZERO;
+        BigDecimal z2 = BigDecimal.ZERO;
+        assertSame(z1, z2);
+    }
+
+    @Test
+    void whenCallingNewBigDecimal_thenAlwaysGetTheSameObject() {
+        BigDecimal z1 = new BigDecimal(0);
+        BigDecimal z2 = new BigDecimal(0);
+        assertNotSame(z1, z2);
+    }
+
+}