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BAEL-5383 code for the use delimiters article
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core-java-modules/core-java-9/src/main/java/com/baeldung/java9/delimiters/DelimiterDemo.java
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package com.baeldung.java9.delimiters; | ||
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import java.util.ArrayList; | ||
import java.util.List; | ||
import java.util.Scanner; | ||
import java.util.regex.Pattern; | ||
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public class DelimiterDemo { | ||
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public static List<String> scannerWithDelimiter(String input, String delimiter) { | ||
try (Scanner scan = new Scanner(input)) { | ||
scan.useDelimiter(delimiter); | ||
List<String> result = new ArrayList<String>(); | ||
scan.forEachRemaining(result::add); | ||
return result; | ||
} | ||
} | ||
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public static List<String> scannerWithDelimiterUsingPattern(String input, Pattern delimiter) { | ||
try (Scanner scan = new Scanner(input)) { | ||
scan.useDelimiter(delimiter); | ||
List<String> result = new ArrayList<String>(); | ||
scan.forEachRemaining(result::add); | ||
return result; | ||
} | ||
} | ||
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public static List<String> baseScanner(String input) { | ||
try (Scanner scan = new Scanner(input)) { | ||
List<String> result = new ArrayList<String>(); | ||
scan.forEachRemaining(result::add); | ||
return result; | ||
} | ||
} | ||
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} |
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...odules/core-java-9/src/test/java/com/baeldung/java9/delimiters/DelimiterDemoUnitTest.java
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package com.baeldung.java9.delimiters; | ||
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import static org.junit.jupiter.api.Assertions.assertEquals; | ||
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import java.util.Arrays; | ||
import java.util.List; | ||
import java.util.function.BiFunction; | ||
import java.util.regex.Pattern; | ||
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import org.junit.jupiter.api.Test; | ||
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class DelimiterDemoUnitTest { | ||
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@Test | ||
void givenSimpleCharacterDelimiter_whenScannerWithDelimiter_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiter, "Welcome to Baeldung", "\\s", Arrays.asList("Welcome", "to", "Baeldung")); | ||
} | ||
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@Test | ||
void givenStringDelimiter_whenScannerWithDelimiter_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiter, "HelloBaeldungHelloWorld", "Hello", Arrays.asList("Baeldung", "World")); | ||
} | ||
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@Test | ||
void givenVariousPossibleDelimiters_whenScannerWithDelimiter_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiter, "Welcome to Baeldung.\nThank you for reading.\nThe team", "\n|\\s", Arrays.asList("Welcome", "to", "Baeldung.", "Thank", "you", "for", "reading.", "The", "team")); | ||
} | ||
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@Test | ||
void givenWildcardRegexDelimiter_whenScannerWithDelimiter_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiter, "1aaaaaaa2aa3aaa4", "a+", Arrays.asList("1", "2", "3", "4")); | ||
} | ||
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@Test | ||
void givenSimpleCharacterDelimiter_whenScannerWithDelimiterUsingPattern_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiterUsingPattern, "Welcome to Baeldung", Pattern.compile("\\s"), Arrays.asList("Welcome", "to", "Baeldung")); | ||
} | ||
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@Test | ||
void givenStringDelimiter_whenScannerWithDelimiterUsingPattern_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiterUsingPattern, "HelloBaeldungHelloWorld", Pattern.compile("Hello"), Arrays.asList("Baeldung", "World")); | ||
} | ||
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@Test | ||
void givenVariousPossibleDelimiters_whenScannerWithDelimiterUsingPattern_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiterUsingPattern, "Welcome to Baeldung.\nThank you for reading.\nThe team", Pattern.compile("\n|\\s"), Arrays.asList("Welcome", "to", "Baeldung.", "Thank", "you", "for", "reading.", "The", "team")); | ||
} | ||
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@Test | ||
void givenWildcardRegexDelimiters_whenScannerWithDelimiterUsingPattern_ThenInputIsCorrectlyParsed() { | ||
checkOutput(DelimiterDemo::scannerWithDelimiterUsingPattern, "1aaaaaaa2aa3aaa4", Pattern.compile("a*"), Arrays.asList("1", "2", "3", "4")); | ||
} | ||
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void checkOutput(BiFunction<String, String, List<String>> function, String input, String delimiter, List<String> expectedOutput) { | ||
assertEquals(expectedOutput, function.apply(input, delimiter)); | ||
} | ||
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void checkOutput(BiFunction<String, Pattern, List<String>> function, String input, Pattern delimiter, List<String> expectedOutput) { | ||
assertEquals(expectedOutput, function.apply(input, delimiter)); | ||
} | ||
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@Test | ||
void whenBaseScanner_ThenWhitespacesAreUsedAsDelimiters() { | ||
assertEquals(List.of("Welcome", "at", "Baeldung"), DelimiterDemo.baseScanner("Welcome at Baeldung")); | ||
} | ||
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} |