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BAEL-9300: Added simple examples with tests #18784

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BAEL-9300: Added simple examples with tests #18784

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84 changes: 84 additions & 0 deletions ...ules/core-java-numbers-10/src/main/java/com/baeldung/doublenonvalues/DoubleNonValues.java
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package com.baeldung.doublenonvalues;

public class DoubleNonValues {

public static double findLargestThrowException(double[] array) {
if (array.length == 0) {
throw new IllegalArgumentException("Array cannot be empty");
}

double max = array[0];
for (int i = 1; i < array.length; i++) {
if (array[i] > max) {
max = array[i];
}
}
return max;
}

public static double findLargestIgnoreNonValues(double[] array) {
double max = Double.NEGATIVE_INFINITY;
boolean foundValidValue = false;

for (double value : array) {
if (!Double.isNaN(value) && !Double.isInfinite(value)) {
if (!foundValidValue || value > max) {
max = value;
foundValidValue = true;
}
}
}

return foundValidValue ? max : -1.0;
}

public static double findLargestReturnNegativeOne(double[] array) {
if (array.length == 0) {
return -1.0;
}

double max = Double.NEGATIVE_INFINITY;
boolean foundValidValue = false;

for (double value : array) {
if (!Double.isNaN(value) && !Double.isInfinite(value)) {
if (!foundValidValue || value > max) {
max = value;
foundValidValue = true;
}
}
}

return foundValidValue ? max : -1.0;
}

public static Double findLargestWithWrapper(double[] array) {
Double max = null;

for (double value : array) {
if (!Double.isNaN(value) && !Double.isInfinite(value)) {
if (max == null || value > max) {
max = value;
}
}
}

return max;
}

public static double findLargestReturnNaN(double[] array) {
double max = Double.NEGATIVE_INFINITY;
boolean foundValidValue = false;

for (double value : array) {
if (!Double.isNaN(value) && !Double.isInfinite(value)) {
if (!foundValidValue || value > max) {
max = value;
foundValidValue = true;
}
}
}

return foundValidValue ? max : Double.NaN;
}
}
80 changes: 80 additions & 0 deletions ...e-java-numbers-10/src/test/java/com/baeldung/doublenonvalues/DoubleNonValuesUnitTest.java
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package com.baeldung.doublenonvalues;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;

public class DoubleNonValuesUnitTest {

@Test
public void testDemonstrateNaNBehavior() {
double nan1 = Double.NaN;
double nan2 = Double.NaN;

// Test that NaN == NaN is always false
assertFalse(nan1 == nan2);

// Test that Double.isNaN() correctly identifies NaN values
assertTrue(Double.isNaN(nan1));
assertTrue(Double.isNaN(nan2));

// Test that the method returns the expected string
String result = DoubleNonValues.demonstrateNaNBehavior();
assertTrue(result.contains("NaN comparison behavior:"));
assertTrue(result.contains("Double.NaN == Double.NaN: false"));
assertTrue(result.contains("Double.isNaN(Double.NaN): true"));
}

@Test
public void testFindLargestThrowException() {
double[] validArray = {1.0, 5.0, 3.0, 9.0, 2.0};
assertEquals(9.0, DoubleNonValues.findLargestThrowException(validArray));

// Test that it throws exception for empty array
assertThrows(IllegalArgumentException.class, () -> {
DoubleNonValues.findLargestThrowException(new double[]{});
});
}

@Test
public void testFindLargestIgnoreNonValues() {
double[] arrayWithNaN = {1.0, Double.NaN, 5.0, Double.POSITIVE_INFINITY, 3.0};
assertEquals(5.0, DoubleNonValues.findLargestIgnoreNonValues(arrayWithNaN));

double[] allInvalidArray = {Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY};
assertEquals(-1.0, DoubleNonValues.findLargestIgnoreNonValues(allInvalidArray));
}

@Test
public void testFindLargestReturnNegativeOne() {
double[] arrayWithNaN = {1.0, Double.NaN, 5.0, Double.POSITIVE_INFINITY, 3.0};
assertEquals(5.0, DoubleNonValues.findLargestReturnNegativeOne(arrayWithNaN));

double[] allInvalidArray = {Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY};
assertEquals(-1.0, DoubleNonValues.findLargestReturnNegativeOne(allInvalidArray));

// Test empty array returns -1.0
assertEquals(-1.0, DoubleNonValues.findLargestReturnNegativeOne(new double[]{}));
}

@Test
public void testFindLargestWithWrapper() {
double[] arrayWithNaN = {1.0, Double.NaN, 5.0, Double.POSITIVE_INFINITY, 3.0};
assertEquals(5.0, DoubleNonValues.findLargestWithWrapper(arrayWithNaN));

double[] allInvalidArray = {Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY};
assertNull(DoubleNonValues.findLargestWithWrapper(allInvalidArray));
}

@Test
public void testFindLargestReturnNaN() {
double[] arrayWithNaN = {1.0, Double.NaN, 5.0, Double.POSITIVE_INFINITY, 3.0};
assertEquals(5.0, DoubleNonValues.findLargestReturnNaN(arrayWithNaN));

double[] allInvalidArray = {Double.NaN, Double.POSITIVE_INFINITY, Double.NEGATIVE_INFINITY};
assertTrue(Double.isNaN(DoubleNonValues.findLargestReturnNaN(allInvalidArray)));
}
}