Introduction to Apache Commons Lang 3 (#1301)
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nguyennamthai
Zeger Hendrikse
parent
c83c449fa5
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>apache-commons</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<properties>
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<junit.version>4.12</junit.version>
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<compiler.version>3.6.0</compiler.version>
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</properties>
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<build>
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<plugins>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${compiler.version}</version>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<dependencies>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.5</version>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung.commons.lang3;
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import org.apache.commons.lang3.ArrayUtils;
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import org.junit.Test;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertArrayEquals;
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public class ArrayUtilsTest {
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@Test
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public void givenArray_whenAddingElementAtSpecifiedPosition_thenCorrect() {
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int[] oldArray = { 2, 3, 4, 5 };
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int[] newArray = ArrayUtils.add(oldArray, 0, 1);
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int[] expectedArray = { 1, 2, 3, 4, 5 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenAddingElementAtTheEnd_thenCorrect() {
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int[] oldArray = { 2, 3, 4, 5 };
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int[] newArray = ArrayUtils.add(oldArray, 1);
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int[] expectedArray = { 2, 3, 4, 5, 1 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenAddingAllElementsAtTheEnd_thenCorrect() {
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int[] oldArray = { 0, 1, 2 };
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int[] newArray = ArrayUtils.addAll(oldArray, 3, 4, 5);
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int[] expectedArray = { 0, 1, 2, 3, 4, 5 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenRemovingElementAtSpecifiedPosition_thenCorrect() {
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int[] oldArray = { 1, 2, 3, 4, 5 };
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int[] newArray = ArrayUtils.remove(oldArray, 1);
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int[] expectedArray = { 1, 3, 4, 5 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenRemovingAllElementsAtSpecifiedPositions_thenCorrect() {
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int[] oldArray = { 1, 2, 3, 4, 5 };
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int[] newArray = ArrayUtils.removeAll(oldArray, 1, 3);
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int[] expectedArray = { 1, 3, 5 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenRemovingAnElement_thenCorrect() {
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int[] oldArray = { 1, 2, 3, 3, 4 };
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int[] newArray = ArrayUtils.removeElement(oldArray, 3);
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int[] expectedArray = { 1, 2, 3, 4 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenRemovingElements_thenCorrect() {
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int[] oldArray = { 1, 2, 3, 3, 4 };
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int[] newArray = ArrayUtils.removeElements(oldArray, 2, 3, 5);
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int[] expectedArray = { 1, 3, 4 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenRemovingAllElementOccurences_thenCorrect() {
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int[] oldArray = { 1, 2, 2, 2, 3 };
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int[] newArray = ArrayUtils.removeAllOccurences(oldArray, 2);
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int[] expectedArray = { 1, 3 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenCheckingExistingElement_thenCorrect() {
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int[] array = { 1, 3, 5, 7, 9 };
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boolean evenContained = ArrayUtils.contains(array, 2);
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boolean oddContained = ArrayUtils.contains(array, 7);
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assertEquals(false, evenContained);
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assertEquals(true, oddContained);
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}
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@Test
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public void givenArray_whenReversingElementsWithinARange_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.reverse(originalArray, 1, 4);
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int[] expectedArray = { 1, 4, 3, 2, 5 };
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assertArrayEquals(expectedArray, originalArray);
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}
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@Test
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public void givenArray_whenReversingAllElements_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.reverse(originalArray);
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int[] expectedArray = { 5, 4, 3, 2, 1 };
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assertArrayEquals(expectedArray, originalArray);
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}
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@Test
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public void givenArray_whenShiftingElementsWithinARange_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.shift(originalArray, 1, 4, 1);
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int[] expectedArray = { 1, 4, 2, 3, 5 };
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assertArrayEquals(expectedArray, originalArray);
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}
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@Test
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public void givenArray_whenShiftingAllElements_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.shift(originalArray, 1);
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int[] expectedArray = { 5, 1, 2, 3, 4 };
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assertArrayEquals(expectedArray, originalArray);
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}
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@Test
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public void givenArray_whenExtractingElements_thenCorrect() {
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int[] oldArray = { 1, 2, 3, 4, 5 };
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int[] newArray = ArrayUtils.subarray(oldArray, 2, 7);
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int[] expectedArray = { 3, 4, 5 };
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assertArrayEquals(expectedArray, newArray);
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}
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@Test
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public void givenArray_whenSwapingElementsWithinARange_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.swap(originalArray, 0, 3, 2);
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int[] expectedArray = { 4, 5, 3, 1, 2 };
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assertArrayEquals(expectedArray, originalArray);
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}
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@Test
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public void givenArray_whenSwapingElementsAtSpecifiedPositions_thenCorrect() {
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int[] originalArray = { 1, 2, 3, 4, 5 };
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ArrayUtils.swap(originalArray, 0, 3);
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int[] expectedArray = { 4, 2, 3, 1, 5 };
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assertArrayEquals(expectedArray, originalArray);
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}
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}
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package com.baeldung.commons.lang3;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.Test;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.assertFalse;
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public class StringUtilsTest {
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@Test
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public void givenString_whenCheckingContainsAny_thenCorrect() {
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String string = "baeldung.com";
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boolean contained1 = StringUtils.containsAny(string, 'a', 'b', 'c');
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boolean contained2 = StringUtils.containsAny(string, 'x', 'y', 'z');
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boolean contained3 = StringUtils.containsAny(string, "abc");
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boolean contained4 = StringUtils.containsAny(string, "xyz");
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assertTrue(contained1);
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assertFalse(contained2);
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assertTrue(contained3);
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assertFalse(contained4);
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}
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@Test
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public void givenString_whenCheckingContainsIgnoreCase_thenCorrect() {
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String string = "baeldung.com";
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boolean contained = StringUtils.containsIgnoreCase(string, "BAELDUNG");
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assertTrue(contained);
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}
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@Test
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public void givenString_whenCountingMatches_thenCorrect() {
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String string = "welcome to www.baeldung.com";
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int charNum = StringUtils.countMatches(string, 'w');
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int stringNum = StringUtils.countMatches(string, "com");
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assertEquals(4, charNum);
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assertEquals(2, stringNum);
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}
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@Test
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public void givenString_whenAppendingAndPrependingIfMissing_thenCorrect() {
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String string = "baeldung.com";
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String stringWithSuffix = StringUtils.appendIfMissing(string, ".com");
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String stringWithPrefix = StringUtils.prependIfMissing(string, "www.");
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assertEquals("baeldung.com", stringWithSuffix);
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assertEquals("www.baeldung.com", stringWithPrefix);
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}
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@Test
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public void givenString_whenSwappingCase_thenCorrect() {
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String originalString = "baeldung.COM";
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String swappedString = StringUtils.swapCase(originalString);
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assertEquals("BAELDUNG.com", swappedString);
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}
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@Test
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public void givenString_whenCapitalizing_thenCorrect() {
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String originalString = "baeldung";
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String capitalizedString = StringUtils.capitalize(originalString);
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assertEquals("Baeldung", capitalizedString);
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}
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@Test
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public void givenString_whenUncapitalizing_thenCorrect() {
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String originalString = "Baeldung";
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String uncapitalizedString = StringUtils.uncapitalize(originalString);
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assertEquals("baeldung", uncapitalizedString);
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}
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@Test
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public void givenString_whenReversingCharacters_thenCorrect() {
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String originalString = "baeldung";
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String reversedString = StringUtils.reverse(originalString);
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assertEquals("gnudleab", reversedString);
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}
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@Test
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public void givenString_whenReversingWithDelimiter_thenCorrect() {
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String originalString = "www.baeldung.com";
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String reversedString = StringUtils.reverseDelimited(originalString, '.');
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assertEquals("com.baeldung.www", reversedString);
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}
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@Test
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public void givenString_whenRotatingTwoPositions_thenCorrect() {
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String originalString = "baeldung";
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String rotatedString = StringUtils.rotate(originalString, 4);
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assertEquals("dungbael", rotatedString);
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}
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@Test
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public void givenTwoStrings_whenComparing_thenCorrect() {
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String tutorials = "Baeldung Tutorials";
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String courses = "Baeldung Courses";
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String diff1 = StringUtils.difference(tutorials, courses);
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String diff2 = StringUtils.difference(courses, tutorials);
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assertEquals("Courses", diff1);
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assertEquals("Tutorials", diff2);
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}
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}
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