BigDecimal & BigInteger data type implementation (#2181)

core-java/src/main/java/com/baeldung/maths/BigDecimalImpl.java

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+package com.baeldung.maths;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
+public class BigDecimalImpl {
+
+    public static void main(String[] args) {
+
+        BigDecimal serviceTax = new BigDecimal("56.0084578639");
+        serviceTax = serviceTax.setScale(2, RoundingMode.CEILING);
+
+        BigDecimal entertainmentTax = new BigDecimal("23.00689");
+        entertainmentTax = entertainmentTax.setScale(2, RoundingMode.FLOOR);
+
+        BigDecimal totalTax = serviceTax.add(entertainmentTax);
+    }
+}

core-java/src/main/java/com/baeldung/maths/BigIntegerImpl.java

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+package com.baeldung.maths;
+
+import java.math.BigInteger;
+
+public class BigIntegerImpl {
+
+    public static void main(String[] args) {
+
+        BigInteger numStarsMilkyWay = new BigInteger("8731409320171337804361260816606476");
+        BigInteger numStarsAndromeda = new BigInteger("5379309320171337804361260816606476");
+        
+        BigInteger totalStars = numStarsMilkyWay.add(numStarsAndromeda);
+
+    }
+
+}

core-java/src/test/java/com/baeldung/maths/BigDecimalImplTest.java

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+package com.baeldung.maths;
+
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class BigDecimalImplTest {
+
+    @Test
+    public void givenBigDecimalNumbers_whenAddedTogether_thenGetExpectedResult() {
+        BigDecimal serviceTax = new BigDecimal("56.0084578639");
+        serviceTax = serviceTax.setScale(2, RoundingMode.CEILING);
+
+        BigDecimal entertainmentTax = new BigDecimal("23.00689");
+        entertainmentTax = entertainmentTax.setScale(2, RoundingMode.FLOOR);
+
+        BigDecimal totalTax = serviceTax.add(entertainmentTax);
+        BigDecimal result = BigDecimal.valueOf(79.01);
+
+        Assert.assertEquals(result, totalTax);
+
+    }
+}

core-java/src/test/java/com/baeldung/maths/BigIntegerImplTest.java

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+package com.baeldung.maths;
+
+import java.math.BigInteger;
+
+import org.junit.Assert;
+
+import org.junit.Test;
+
+public class BigIntegerImplTest {
+
+    @Test
+    public void givenBigIntegerNumbers_whenAddedTogether_thenGetExpectedResult() {
+        BigInteger numStarsMilkyWay = new BigInteger("8731409320171337804361260816606476");
+        BigInteger numStarsAndromeda = new BigInteger("5379309320171337804361260816606476");
+
+        BigInteger totalStars = numStarsMilkyWay.add(numStarsAndromeda);
+        BigInteger result = new BigInteger("14110718640342675608722521633212952");
+
+        Assert.assertEquals(result, totalStars);
+    }
+
+}