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BAEL-9259: https://jira.baeldung.com/browse/BAEL-9259 #18497

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Merged
merged 3 commits into from
May 12, 2025
Merged

BAEL-9259: https://jira.baeldung.com/browse/BAEL-9259 #18497

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f9b6850
init
LeoHelfferich Apr 22, 2025
af578ca
add methods and tests
LeoHelfferich Apr 23, 2025
3918bbd
update on additional method
LeoHelfferich Apr 28, 2025
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38 changes: 38 additions & 0 deletions ...string-operations-12/src/main/java/com/baeldung/minusoperation/StringMinusOperations.java
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@@ -0,0 +1,38 @@
package com.baeldung.minusoperation;

import java.util.stream.Collectors;

/**
* Container for all implementations of what could be considered a 'String-minus-operations'
*/
public class StringMinusOperations {

public static String removeLastCharBySubstring(String sentence) {
return sentence.substring(0, sentence.length() - 1);
}

public static String removeTrailingStringBySubstring(String sentence, String lastSequence) {
var trailing = sentence.substring(sentence.length() - lastSequence.length());
if(trailing.equals(lastSequence)) {
return sentence.substring(0, sentence.length() - lastSequence.length());
} else {
return sentence;
}
}

public static String minusByReplace(String sentence, char removeMe) {
return sentence.replace(String.valueOf(removeMe), "");
}

public static String minusByReplace(String sentence, String removeMe) {
return sentence.replace(removeMe, "");
}

public static String minusByStream(String sentence, char removeMe) {
return sentence.chars()
.mapToObj(c -> (char) c)
.filter(it -> !it.equals(removeMe))
.map(String::valueOf)
.collect(Collectors.joining());
}
}
70 changes: 70 additions & 0 deletions ...perations-12/src/test/java/com/baeldung/minusoperation/StringMinusOperationsUnitTest.java
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package com.baeldung.minusoperation;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.Test;

public class StringMinusOperationsUnitTest {

@Test
public void givenNotBlankString_whenRemovingLastChar_thenReturnOriginalWithoutLastChar() {
var original = "Don't give up!";

var result = StringMinusOperations.removeLastCharBySubstring(original);

assertThat(result).doesNotContain("!")
.isEqualTo("Don't give up"); // no '!' at the end
}

@Test
public void givenNotBlankString_whenRemovingLastString_thenReturnOriginalWithoutLastString() {
var original = "Don't give up!";

var result = StringMinusOperations.removeTrailingStringBySubstring(original, "up!");

assertThat(result).doesNotContain("up!")
.isEqualTo("Don't give "); // no 'up!' at the end
}

@Test
public void givenNotBlankString_whenRemovingLastStringThatDoesNotMatch_thenReturnOriginalString() {
var original = "Don't give up!";

var result = StringMinusOperations.removeTrailingStringBySubstring(original, "foo");

assertThat(result).isEqualTo(original);
}

@Test
public void givenNotBlankString_whenRemovingSpecificChar_thenReturnOriginalWithoutThatChar() {
var original = "Don't give up!";
var toRemove = 't';

var result = StringMinusOperations.minusByReplace(original, toRemove);

assertThat(result).doesNotContain(String.valueOf(toRemove))
.isEqualTo("Don' give up!"); // no 't'
}

@Test
public void givenNotBlankString_whenRemovingSpecificString_thenReturnOriginalWithoutThatString() {
var original = "Don't give up!";
var toRemove = "Don't";

var result = StringMinusOperations.minusByReplace(original, toRemove);

assertThat(result).doesNotContain(toRemove)
.isEqualTo(" give up!"); // no 'Don't'
}

@Test
public void givenNotBlankString_whenRemovingSpecificStringByStream_thenReturnOriginalWithoutThatString() {
var original = "Don't give up!";
var toRemove = ' ';

var result = StringMinusOperations.minusByStream(original, toRemove);

assertThat(result).doesNotContain(String.valueOf(toRemove))
.isEqualTo("Don'tgiveup!"); // no blanks
}
}