From 2dd61b7d54138584a93d1e2949c0860287360ee6 Mon Sep 17 00:00:00 2001 From: Kai Yuan Date: Tue, 25 Oct 2022 03:20:37 +0200 Subject: [PATCH] [strToStrArray] Convert String to string array in Java (#12899) * [strToStrArray] Convert String to string array in Java * [strToStrArray] add one more example --- .../StringToStringArrayUnitTest.java | 49 +++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/strtostrarray/StringToStringArrayUnitTest.java diff --git a/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/strtostrarray/StringToStringArrayUnitTest.java b/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/strtostrarray/StringToStringArrayUnitTest.java new file mode 100644 index 0000000000..c1e31a404e --- /dev/null +++ b/core-java-modules/core-java-string-operations-5/src/test/java/com/baeldung/strtostrarray/StringToStringArrayUnitTest.java @@ -0,0 +1,49 @@ +package com.baeldung.strtostrarray; + +import org.junit.jupiter.api.Test; + +import static org.junit.jupiter.api.Assertions.assertArrayEquals; + +public class StringToStringArrayUnitTest { + private static final String INPUT = "Hi there, nice to meet you!"; + private static final String FLIGHT_INPUT = "20221018LH720FRAPEK"; + + @Test + void givenAString_whenConvertToSingletonArray_shouldGetExpectedResult() { + String[] myArray = new String[] { INPUT }; + assertArrayEquals(new String[] { "Hi there, nice to meet you!" }, myArray); + } + + @Test + void givenAString_whenSplitToWordArray_shouldGetExpectedResult() { + String[] myArray = INPUT.split("\\W+"); + assertArrayEquals(new String[] { "Hi", "there", "nice", "to", "meet", "you" }, myArray); + } + + @Test + void givenAString_whenSplitToSentenceArray_shouldGetExpectedResult() { + String[] myArray = INPUT.split("[-,.!;?]\\s*"); + assertArrayEquals(new String[] { "Hi there", "nice to meet you" }, myArray); + } + + @Test + void givenAString_whenSplitToCharArray_shouldGetExpectedResult() { + String[] myArray = INPUT.split(""); + assertArrayEquals(new String[] { + "H", "i", " ", "t", "h", "e", "r", "e", ",", " ", + "n", "i", "c", "e", " ", "t", "o", " ", "m", "e", "e", "t", " ", "y", "o", "u", "!" + }, myArray); + } + + @Test + void givenAString_whenSpecialRuleRequired_shouldGetExpectedResult() { + String dateStr = FLIGHT_INPUT.substring(0, 8); + String flightNo = FLIGHT_INPUT.substring(8, FLIGHT_INPUT.length() - 6); + int airportStart = dateStr.length() + flightNo.length(); + String from = FLIGHT_INPUT.substring(airportStart, airportStart + 3); + String to = FLIGHT_INPUT.substring(airportStart + 3); + + String[] myArray = new String[] { dateStr, flightNo, from, to }; + assertArrayEquals(new String[] { "20221018", "LH720", "FRA", "PEK" }, myArray); + } +}