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[BAEL-16045] - Fixed article code for https://www.baeldung.com/java-random-string

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amit2103
2019-07-22 00:51:41 +05:30
parent 85d3960cf8
commit 9cf7d4d67d
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217
java-numbers/src/test/java/com/baeldung/random/JavaRandomUnitTest.java
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package com.baeldung.random;
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);
}
}