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bael-2361 (#5804)

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* bael-2361

* Update RemoveLeadingAndTrailingZeroes.java

* moving examples to java-string project
This commit is contained in:
fanatixan 2018-12-02 19:36:38 +01:00 committed by maibin
parent 0a87548bf8
commit 857192358c
2 changed files with 246 additions and 0 deletions
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103
java-strings/src/main/java/com/baeldung/string/removeleadingtrailingchar/RemoveLeadingAndTrailingZeroes.java Normal file
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package com.baeldung.string.removeleadingtrailingchar;
import org.apache.commons.lang3.StringUtils;
import com.google.common.base.CharMatcher;
public class RemoveLeadingAndTrailingZeroes {
public static String removeLeadingZeroesWithStringBuilder(String s) {
StringBuilder sb = new StringBuilder(s);
while (sb.length() > 1 && sb.charAt(0) == '0') {
sb.deleteCharAt(0);
}
return sb.toString();
}
public static String removeTrailingZeroesWithStringBuilder(String s) {
StringBuilder sb = new StringBuilder(s);
while (sb.length() > 1 && sb.charAt(sb.length() - 1) == '0') {
sb.setLength(sb.length() - 1);
}
return sb.toString();
}
public static String removeLeadingZeroesWithSubstring(String s) {
int index = 0;
for (; index < s.length() - 1; index++) {
if (s.charAt(index) != '0') {
break;
}
}
return s.substring(index);
}
public static String removeTrailingZeroesWithSubstring(String s) {
int index = s.length() - 1;
for (; index > 0; index--) {
if (s.charAt(index) != '0') {
break;
}
}
return s.substring(0, index + 1);
}
public static String removeLeadingZeroesWithApacheCommonsStripStart(String s) {
String stripped = StringUtils.stripStart(s, "0");
if (stripped.isEmpty() && !s.isEmpty()) {
return "0";
}
return stripped;
}
public static String removeTrailingZeroesWithApacheCommonsStripEnd(String s) {
String stripped = StringUtils.stripEnd(s, "0");
if (stripped.isEmpty() && !s.isEmpty()) {
return "0";
}
return stripped;
}
public static String removeLeadingZeroesWithGuavaTrimLeadingFrom(String s) {
String stripped = CharMatcher.is('0')
.trimLeadingFrom(s);
if (stripped.isEmpty() && !s.isEmpty()) {
return "0";
}
return stripped;
}
public static String removeTrailingZeroesWithGuavaTrimTrailingFrom(String s) {
String stripped = CharMatcher.is('0')
.trimTrailingFrom(s);
if (stripped.isEmpty() && !s.isEmpty()) {
return "0";
}
return stripped;
}
public static String removeLeadingZeroesWithRegex(String s) {
return s.replaceAll("^0+(?!$)", "");
}
public static String removeTrailingZeroesWithRegex(String s) {
return s.replaceAll("(?!^)0+$", "");
}
}

143
java-strings/src/test/java/com/baeldung/string/removeleadingtrailingchar/RemoveLeadingAndTrailingZeroesUnitTest.java Normal file
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package com.baeldung.string.removeleadingtrailingchar;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.stream.Stream;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
public class RemoveLeadingAndTrailingZeroesUnitTest {
public static Stream<Arguments> leadingZeroTestProvider() {
return Stream.of(Arguments.of("", ""), Arguments.of("abc", "abc"), Arguments.of("123", "123"), Arguments.of("0abc", "abc"), Arguments.of("0123", "123"), Arguments.of("0000123", "123"), Arguments.of("1230", "1230"), Arguments.of("01230", "1230"), Arguments.of("01", "1"),
Arguments.of("0001", "1"), Arguments.of("0", "0"), Arguments.of("00", "0"), Arguments.of("0000", "0"), Arguments.of("12034", "12034"), Arguments.of("1200034", "1200034"), Arguments.of("0012034", "12034"), Arguments.of("1203400", "1203400"));
}
public static Stream<Arguments> trailingZeroTestProvider() {
return Stream.of(Arguments.of("", ""), Arguments.of("abc", "abc"), Arguments.of("123", "123"), Arguments.of("abc0", "abc"), Arguments.of("1230", "123"), Arguments.of("1230000", "123"), Arguments.of("0123", "0123"), Arguments.of("01230", "0123"), Arguments.of("10", "1"),
Arguments.of("1000", "1"), Arguments.of("0", "0"), Arguments.of("00", "0"), Arguments.of("0000", "0"), Arguments.of("12034", "12034"), Arguments.of("1200034", "1200034"), Arguments.of("0012034", "0012034"), Arguments.of("1203400", "12034"));
}
@ParameterizedTest
@MethodSource("leadingZeroTestProvider")
public void givenTestStrings_whenRemoveLeadingZeroesWithStringBuilder_thenReturnWithoutLeadingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeLeadingZeroesWithStringBuilder(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("trailingZeroTestProvider")
public void givenTestStrings_whenRemoveTrailingZeroesWithStringBuilder_thenReturnWithoutTrailingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeTrailingZeroesWithStringBuilder(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("leadingZeroTestProvider")
public void givenTestStrings_whenRemoveLeadingZeroesWithSubstring_thenReturnWithoutLeadingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeLeadingZeroesWithSubstring(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("trailingZeroTestProvider")
public void givenTestStrings_whenRemoveTrailingZeroesWithSubstring_thenReturnWithoutTrailingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeTrailingZeroesWithSubstring(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("leadingZeroTestProvider")
public void givenTestStrings_whenRemoveLeadingZeroesWithApacheCommonsStripStart_thenReturnWithoutLeadingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeLeadingZeroesWithApacheCommonsStripStart(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("trailingZeroTestProvider")
public void givenTestStrings_whenRemoveTrailingZeroesWithApacheCommonsStripEnd_thenReturnWithoutTrailingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeTrailingZeroesWithApacheCommonsStripEnd(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("leadingZeroTestProvider")
public void givenTestStrings_whenRemoveLeadingZeroesWithGuavaTrimLeadingFrom_thenReturnWithoutLeadingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeLeadingZeroesWithGuavaTrimLeadingFrom(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("trailingZeroTestProvider")
public void givenTestStrings_whenRemoveTrailingZeroesWithGuavaTrimTrailingFrom_thenReturnWithoutTrailingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeTrailingZeroesWithGuavaTrimTrailingFrom(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("leadingZeroTestProvider")
public void givenTestStrings_whenRemoveLeadingZeroesWithRegex_thenReturnWithoutLeadingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeLeadingZeroesWithRegex(input);
// then
assertThat(result).isEqualTo(expected);
}
@ParameterizedTest
@MethodSource("trailingZeroTestProvider")
public void givenTestStrings_whenRemoveTrailingZeroesWithRegex_thenReturnWithoutTrailingZeroes(String input, String expected) {
// given
// when
String result = RemoveLeadingAndTrailingZeroes.removeTrailingZeroesWithRegex(input);
// then
assertThat(result).isEqualTo(expected);
}
}