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positive

This commit is contained in:
@hangga 2023-11-01 16:27:09 +07:00
parent 10ddc97854
commit e0ca0be76a
1 changed files with 5 additions and 11 deletions
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16
core-java-modules/core-java-uuid/src/test/java/com/baeldung/uuid/UUIDPositiveLongGeneratorUnitTest.java
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@ -28,33 +28,27 @@ public class UUIDPositiveLongGeneratorUnitTest {
private void printTableHeader() { private void printTableHeader() {
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", "Approach", "collisions", "negatives", "collision", "negative")); logger.info(String.format("%-30s %-15s %-15s", "Approach(method name)", "collisions", "probability"));
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", "(method name)", "count", "count", "probability", "probability")); logger.info("-----------------------------------------------------------------------");
logger.info("--------------------------------------------------------------------------------------------");
} }
private void printOutput(String method, int collisionsCount, int negativeCount, double collisionsProbability, double negativeProbability) { private void printOutput(String method, int collisionsCount, double collisionsProbability) {
DecimalFormat decimalFormat = new DecimalFormat("#.#####"); DecimalFormat decimalFormat = new DecimalFormat("#.#####");
logger.info(String.format("%-30s %-15s %-15s %-15s %-15s", method, collisionsCount, negativeCount, decimalFormat.format(collisionsProbability), decimalFormat.format(negativeProbability))); logger.info(String.format("%-30s %-15s %-15s", method, collisionsCount, decimalFormat.format(collisionsProbability)));
} }
private void collisionCheck(Method method) throws InvocationTargetException, IllegalAccessException { private void collisionCheck(Method method) throws InvocationTargetException, IllegalAccessException {
Set<Long> uniqueValues = new HashSet<>(); Set<Long> uniqueValues = new HashSet<>();
int collisions = 0; int collisions = 0;
int negative = 0;
for (int i = 0; i < n; i++) { for (int i = 0; i < n; i++) {
long uniqueValue = (long) method.invoke(uuidLongGenerator); long uniqueValue = (long) method.invoke(uuidLongGenerator);
if (!uniqueValues.add(uniqueValue)) { if (!uniqueValues.add(uniqueValue)) {
collisions++; collisions++;
} }
if (uniqueValue < 0) {
negative++;
}
} }
double collisionsProbability = (double) collisions / n; double collisionsProbability = (double) collisions / n;
double negativeProbability = (double) negative / n; printOutput(method.getName(), collisions, collisionsProbability);
printOutput(method.getName(), collisions, negative, collisionsProbability, negativeProbability);
assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD); assertThat(collisionsProbability).isLessThan(COLLISION_THRESHOLD);
} }
} }