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BAEL-6015: Split String by Whitespace in Java (#13146) 

- Using split() method of String class
- Using StringTokenizer class
- Using split() utility method of the StringUtils class

Co-authored-by: Tapan Avasthi <tavasthi@Tapans-MacBook-Air.local>
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Tapan Avasthi 2022-12-19 09:37:11 +05:30 committed by GitHub
parent ee9122794c
commit 39f29ec690
1 changed files with 104 additions and 0 deletions
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core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/splitstring/SplitStringUnitTest.java Normal file
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package com.baeldung.splitstring;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNull;
import java.util.StringTokenizer;
import org.apache.commons.lang3.StringUtils;
import org.junit.Test;
public class SplitStringUnitTest {
private static final String SPACE = " ";
private static final String TAB = " ";
private static final String NEW_LINE = "\n";
private static final String FRUITS_TAB_SEPARATED = "Apple" + TAB + "Banana" + TAB + "Mango" + TAB + "Orange";
private static final String FRUITS_SPACE_SEPARATED = "Apple" + SPACE + "Banana" + SPACE + "Mango" + SPACE + "Orange";
private static final String FRUITS_NEWLINE_SEPARATED = "Apple" + NEW_LINE + "Banana" + NEW_LINE + "Mango" + NEW_LINE + "Orange";
@Test
public void givenSpaceSeparatedString_whenSplitUsingSpace_shouldGetExpectedResult() {
String fruits = FRUITS_SPACE_SEPARATED;
String[] fruitArray = fruits.split(SPACE);
verifySplit(fruitArray);
}
@Test
public void givenTabSeparatedString_whenSplitUsingTab_shouldGetExpectedResult() {
String fruits = FRUITS_TAB_SEPARATED;
String[] fruitArray = fruits.split(TAB);
verifySplit(fruitArray);
}
@Test
public void givenNewlineSeparatedString_whenSplitUsingNewline_shouldGetExpectedResult() {
String fruits = FRUITS_NEWLINE_SEPARATED;
String[] fruitArray = fruits.split(NEW_LINE);
verifySplit(fruitArray);
}
@Test
public void givenTabSeparatedString_whenSplitUsingSpace_shouldNowSplit() {
String fruits = FRUITS_TAB_SEPARATED;
String[] fruitArray = fruits.split(" ");
assertEquals(1, fruitArray.length);
assertEquals(fruits, fruitArray[0]);
}
@Test
public void givenWhiteSpaceSeparatedString_whenSplitUsingWhiteSpaceRegex_shouldGetExpectedResult() {
String whitespaceRegex = SPACE + "|" + TAB + "|" + NEW_LINE;
String[] allSamples = new String[] { FRUITS_SPACE_SEPARATED, FRUITS_TAB_SEPARATED, FRUITS_NEWLINE_SEPARATED };
for (String fruits : allSamples) {
String[] fruitArray = fruits.split(whitespaceRegex);
verifySplit(fruitArray);
}
}
@Test
public void givenNewlineSeparatedString_whenSplitUsingWhiteSpaceMetaChar_shouldGetExpectedResult() {
String whitespaceMetaChar = "\\s";
String[] allSamples = new String[] { FRUITS_SPACE_SEPARATED, FRUITS_TAB_SEPARATED, FRUITS_NEWLINE_SEPARATED };
for (String fruits : allSamples) {
String[] fruitArray = fruits.split(whitespaceMetaChar);
verifySplit(fruitArray);
}
}
@Test
public void givenSpaceSeparatedString_whenSplitUsingStringTokenizer_shouldGetExpectedResult() {
String fruits = FRUITS_SPACE_SEPARATED;
StringTokenizer tokenizer = new StringTokenizer(fruits);
String[] fruitArray = new String[tokenizer.countTokens()];
int index = 0;
while (tokenizer.hasMoreTokens()) {
fruitArray[index++] = tokenizer.nextToken();
}
verifySplit(fruitArray);
}
@Test
public void givenWhiteSpaceSeparatedString_whenSplitUsingStringUtils_shouldGetExpectedResult() {
String[] allSamples = new String[] { FRUITS_SPACE_SEPARATED, FRUITS_TAB_SEPARATED, FRUITS_NEWLINE_SEPARATED };
for (String fruits : allSamples) {
String[] fruitArray = StringUtils.split(fruits);
verifySplit(fruitArray);
}
}
@Test
public void givenNullString_whenSplitUsingStringUtils_shouldReturnNull() {
String fruits = null;
String[] fruitArray = StringUtils.split(fruits);
assertNull(fruitArray);
}
private void verifySplit(String[] fruitArray) {
assertEquals(4, fruitArray.length);
assertEquals("Apple", fruitArray[0]);
assertEquals("Banana", fruitArray[1]);
assertEquals("Mango", fruitArray[2]);
assertEquals("Orange", fruitArray[3]);
}
}