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BAEL-1889 - Let's move the Java Number articles into a new module (#4619)

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* BAEL-1849 - Convert from String to Date in Java

* BAEL-1863 - Calling Callbacks with Mockito

* BAEL-1889 - Let's move the Java Number articles into a new module

* BAEL-1889 - Let's move the Java Number articles into a new module
This commit is contained in:
Jonathan Cook
2018-07-14 15:00:37 +02:00
committed by Grzegorz Piwowarek
parent de2afd7da8
commit b44883b364
41 changed files with 380 additions and 188 deletions
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core-java/src/test/java/com/baeldung/maths/BigDecimalImplUnitTest.java
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package com.baeldung.maths;
import org.junit.Assert;
import org.junit.Test;
import java.math.BigDecimal;
import java.math.RoundingMode;
public class BigDecimalImplUnitTest {
@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/BigIntegerImplUnitTest.java
-21
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package com.baeldung.maths;
import org.junit.Assert;
import org.junit.Test;
import java.math.BigInteger;
public class BigIntegerImplUnitTest {
@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);
}
}
core-java/src/test/java/com/baeldung/maths/FloatingPointArithmeticUnitTest.java
-45
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package com.baeldung.maths;
import java.math.BigDecimal;
import org.junit.Assert;
import org.junit.Test;
public class FloatingPointArithmeticUnitTest {
@Test
public void givenDecimalNumbers_whenAddedTogether_thenGetExpectedResult() {
double a = 13.22;
double b = 4.88;
double c = 21.45;
double result = 39.55;
double abc = a + b + c;
double acb = a + c + b;
Assert.assertEquals(result, abc, 0);
Assert.assertNotEquals(result, acb, 0);
double ab = 18.1;
double ac = 34.67;
double ab_c = ab + c;
double ac_b = ac + b;
Assert.assertEquals(result, ab_c, 0);
Assert.assertNotEquals(result, ac_b, 0);
BigDecimal d = new BigDecimal(String.valueOf(a));
BigDecimal e = new BigDecimal(String.valueOf(b));
BigDecimal f = new BigDecimal(String.valueOf(c));
BigDecimal sum = new BigDecimal("39.55");
BigDecimal def = d.add(e).add(f);
BigDecimal dfe = d.add(f).add(e);
Assert.assertEquals(0, def.compareTo(sum));
Assert.assertEquals(0, dfe.compareTo(sum));
Assert.assertNotEquals(0, sum.compareTo(new BigDecimal(String.valueOf(acb))));
}
}
core-java/src/test/java/com/baeldung/maths/RoundUnitTest.java
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package com.baeldung.maths;
import org.apache.commons.math3.util.Precision;
import org.decimal4j.util.DoubleRounder;
import org.junit.Assert;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
public class RoundUnitTest {
private double value = 2.03456d;
private int places = 2;
private double delta = 0.0d;
private double expected = 2.03d;
@Test
public void givenDecimalNumber_whenRoundToNDecimalPlaces_thenGetExpectedResult() {
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
places = 3;
expected = 2.035d;
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
value = 1000.0d;
places = 17;
expected = 1000.0d;
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 92.23372036854776 !
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
value = 256.025d;
places = 2;
expected = 256.03d;
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 256.02 !
Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 256.02 !
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 256.02 !
value = 260.775d;
places = 2;
expected = 260.78d;
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 260.77 !
Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 260.77 !
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 260.77 !
value = 90080070060.1d;
places = 9;
expected = 90080070060.1d;
Assert.assertEquals(expected, Round.round(value, places), delta);
Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 9.223372036854776E9 !
Assert.assertEquals(expected, Precision.round(value, places), delta);
Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
}
}
core-java/src/test/java/com/baeldung/numberofdigits/NumberOfDigitsIntegrationTest.java
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package com.baeldung.numberofdigits;
import org.junit.Assert;
import org.junit.Assume;
import org.junit.experimental.theories.DataPoints;
import org.junit.experimental.theories.Theories;
import org.junit.experimental.theories.Theory;
import org.junit.runner.RunWith;
@RunWith(Theories.class)
public class NumberOfDigitsIntegrationTest {
private static NumberOfDigits numberOfDigits;
static {
numberOfDigits = new NumberOfDigits();
}
@DataPoints
public static int[][] lowestIntegers()
{
return new int[][]{
{1, 1},
{2, 10},
{3, 100},
{4, 1000},
{5, 10000},
{6, 100000},
{7, 1000000},
{8, 10000000},
{9, 100000000},
{10, 1000000000}
};
}
@DataPoints
public static int[][] highestIntegers()
{
return new int[][]{
{1, 9},
{2, 99},
{3, 999},
{4, 9999},
{5, 99999},
{6, 999999},
{7, 9999999},
{8, 99999999},
{9, 999999999},
{10, Integer.MAX_VALUE}
};
}
@DataPoints
public static int[][] randomIntegers()
{
return new int[][]{
{1, 1},
{2, 14},
{3, 549},
{4, 1136},
{5, 25340},
{6, 134321},
{7, 1435432},
{8, 54234129},
{9, 113683912},
{10, 1534031982}
};
}
@Theory
public void givenDataPoints_whenStringBasedSolutionInvoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.stringBasedSolution(entry[1]));
}
@Theory
public void givenDataPoints_whenLogarithmicApproachInvoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.logarithmicApproach(entry[1]));
}
@Theory
public void givenDataPoints_whenRepeatedMultiplicationInvoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.repeatedMultiplication(entry[1]));
}
@Theory
public void givenDataPoints_whenShiftOperatorsInvoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.shiftOperators(entry[1]));
}
@Theory
public void givenDataPoints_whenDividingWithPowersOf2Invoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.dividingWithPowersOf2(entry[1]));
}
@Theory
public void givenDataPoints_whenDivideAndConquerInvoked_thenAllPointsMatch(final int[] entry) {
Assume.assumeTrue(entry[0] > 0 && entry[1] > 0);
Assert.assertEquals(entry[0], numberOfDigits.divideAndConquer(entry[1]));
}
}
core-java/src/test/java/org/baeldung/java/JavaRandomUnitTest.java
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package org.baeldung.java;
import org.apache.commons.lang3.RandomStringUtils;
import org.apache.commons.math3.random.RandomDataGenerator;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.nio.charset.Charset;
import java.util.Random;
public class JavaRandomUnitTest {
private static final Logger LOG = LoggerFactory.getLogger(JavaRandomUnitTest.class);
// tests - random long
@Test
public void givenUsingPlainJava_whenGeneratingRandomLongUnbounded_thenCorrect() {
final long generatedLong = new Random().nextLong();
LOG.debug("{}", generatedLong);
}
@Test
public void givenUsingApacheCommons_whenGeneratingRandomLongUnbounded_thenCorrect() {
final long generatedLong = new RandomDataGenerator().getRandomGenerator()
.nextLong();
LOG.debug("{}", generatedLong);
}
@Test
public void givenUsingPlainJava_whenGeneratingRandomLongBounded_thenCorrect() {
final long leftLimit = 1L;
final long rightLimit = 10L;
final long generatedLong = leftLimit + (long) (Math.random() * (rightLimit - leftLimit));
LOG.debug("{}", generatedLong);
}
@Test
public void givenUsingApacheCommons_whenGeneratingRandomLongBounded_thenCorrect() {
final long leftLimit = 10L;
final long rightLimit = 100L;
final long generatedLong = new RandomDataGenerator().nextLong(leftLimit, rightLimit);
LOG.debug("{}", generatedLong);
}
// tests - random int
@Test
public void givenUsingPlainJava_whenGeneratingRandomIntegerUnbounded_thenCorrect() {
final int generatedInteger = new Random().nextInt();
LOG.debug("{}", generatedInteger);
}
@Test
public void givenUsingPlainJava_whenGeneratingRandomIntegerBounded_thenCorrect() {
final int leftLimit = 1;
final int rightLimit = 10;
final int generatedInteger = leftLimit + (int) (new Random().nextFloat() * (rightLimit - leftLimit));
LOG.debug("{}", generatedInteger);
}
@Test
public void givenUsingApache_whenGeneratingRandomIntegerUnbounded_thenCorrect() {
final Integer generatedInteger = new RandomDataGenerator().getRandomGenerator()
.nextInt();
LOG.debug("{}", generatedInteger);
}
@Test
public void givenUsingApache_whenGeneratingRandomIntegerBounded_thenCorrect() {
final int leftLimit = 1;
final int rightLimit = 10;
final int generatedInteger = new RandomDataGenerator().nextInt(leftLimit, rightLimit);
LOG.debug("{}", generatedInteger);
}
// tests - random float
@Test
public void givenUsingPlainJava_whenGeneratingRandomFloatUnbouned_thenCorrect() {
final float generatedFloat = new Random().nextFloat();
LOG.debug("{}", generatedFloat);
}
@Test
public void givenUsingApache_whenGeneratingRandomFloatUnbounded_thenCorrect() {
final float generatedFloat = new RandomDataGenerator().getRandomGenerator()
.nextFloat();
LOG.debug("{}", generatedFloat);
}
@Test
public void givenUsingPlainJava_whenGeneratingRandomFloatBouned_thenCorrect() {
final float leftLimit = 1F;
final float rightLimit = 10F;
final float generatedFloat = leftLimit + new Random().nextFloat() * (rightLimit - leftLimit);
LOG.debug("{}", generatedFloat);
}
@Test
public void givenUsingApache_whenGeneratingRandomFloatBounded_thenCorrect() {
final float leftLimit = 1F;
final float rightLimit = 10F;
final float randomFloat = new RandomDataGenerator().getRandomGenerator()
.nextFloat();
final float generatedFloat = leftLimit + randomFloat * (rightLimit - leftLimit);
LOG.debug("{}", generatedFloat);
}
// tests - random double
@Test
public void givenUsingPlainJava_whenGeneratingRandomDoubleUnbounded_thenCorrect() {
final double generatedDouble = Math.random();
LOG.debug("{}", generatedDouble);
}
@Test
public void givenUsingApache_whenGeneratingRandomDoubleUnbounded_thenCorrect() {
final double generatedDouble = new RandomDataGenerator().getRandomGenerator()
.nextDouble();
LOG.debug("{}", generatedDouble);
}
@Test
public void givenUsingPlainJava_whenGeneratingRandomDoubleBounded_thenCorrect() {
final double leftLimit = 1D;
final double rightLimit = 10D;
final double generatedDouble = leftLimit + new Random().nextDouble() * (rightLimit - leftLimit);
LOG.debug("{}", generatedDouble);
}
@Test
public void givenUsingApache_whenGeneratingRandomDoubleBounded_thenCorrect() {
final double leftLimit = 1D;
final double rightLimit = 100D;
final double generatedDouble = new RandomDataGenerator().nextUniform(leftLimit, rightLimit);
LOG.debug("{}", generatedDouble);
}
// tests - random String
@Test
public void givenUsingPlainJava_whenGeneratingRandomStringUnbounded_thenCorrect() {
final byte[] array = new byte[7]; // length is bounded by 7
new Random().nextBytes(array);
final String generatedString = new String(array, Charset.forName("UTF-8"));
LOG.debug(generatedString);
}
@Test
public void givenUsingPlainJava_whenGeneratingRandomStringBounded_thenCorrect() {
final int leftLimit = 97; // letter 'a'
final int rightLimit = 122; // letter 'z'
final int targetStringLength = 10;
final Random random = new Random();
final StringBuilder buffer = new StringBuilder(targetStringLength);
for (int i = 0; i < targetStringLength; i++) {
final int randomLimitedInt = leftLimit + (int) (random.nextFloat() * (rightLimit - leftLimit + 1));
buffer.append((char) randomLimitedInt);
}
final String generatedString = buffer.toString();
LOG.debug(generatedString);
}
@Test
public void givenUsingApache_whenGeneratingRandomString_thenCorrect() {
final String generatedString = RandomStringUtils.random(10);
LOG.debug(generatedString);
}
@Test
public void givenUsingApache_whenGeneratingRandomAlphabeticString_thenCorrect() {
final String generatedString = RandomStringUtils.randomAlphabetic(10);
LOG.debug(generatedString);
}
@Test
public void givenUsingApache_whenGeneratingRandomAlphanumericString_thenCorrect() {
final String generatedString = RandomStringUtils.randomAlphanumeric(10);
LOG.debug(generatedString);
}
@Test
public void givenUsingApache_whenGeneratingRandomStringBounded_thenCorrect() {
final int length = 10;
final boolean useLetters = true;
final boolean useNumbers = false;
final String generatedString = RandomStringUtils.random(length, useLetters, useNumbers);
LOG.debug(generatedString);
}
}