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https://jira.baeldung.com/browse/BAEL- 

1. moving modules to java-string-conversions
2. fixing old broken test
This commit is contained in:
Deboshree 2023-03-24 21:41:26 +05:30
parent 4abc9c1a39
commit 979b362ad1
3 changed files with 128 additions and 9 deletions
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53
core-java-modules/core-java-string-conversions/src/main/java/com/baeldung/stringtoint/StringToIntEncapsulation.java Normal file
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@ -0,0 +1,53 @@
package com.baeldung.stringtoint;
import java.util.Optional;
import org.apache.commons.lang3.math.NumberUtils;
public class StringToIntEncapsulation {
private StringToIntEncapsulation() {
}
public static Integer convertStringToIntUsingIntegerParseInt(String input){
try {
return Integer.parseInt(input);
} catch (NumberFormatException e) {
// log or handle the error
return null; // or Integer.MIN_VALUE, or some other default value
}
}
public static Integer convertStringToIntUsingIntegerValueOf(String input){
try {
return Integer.valueOf(input);
} catch (NumberFormatException e) {
// log or handle the error
return null; // or Integer.MIN_VALUE, or some other default value
}
}
public static Integer convertStringToIntUsingIntegerDecode(String input){
try {
return Integer.decode(input);
} catch (Exception e) {
// log or handle the error
return null; // or Integer.MIN_VALUE, or some other default value
}
}
public static Integer converStringToIntUsingOptional(String input){
Optional<Integer> parsedInt;
try {
parsedInt = Optional.of(Integer.parseInt(input));
} catch (Exception e) {
// log or handle the error
parsedInt = Optional.empty();
}
return parsedInt.orElse(null);
}
public static int convertStringToIntUsingNumberUtils(String input){
//returns Integer.MIN_VALUE as the default value if conversion fails
return NumberUtils.toInt(input, Integer.MIN_VALUE);
}
}

17
core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/datetostring/DateToStringFormatterUnitTest.java
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@ -19,7 +19,6 @@ import static org.junit.Assert.assertEquals;
public class DateToStringFormatterUnitTest {
private static final String DATE_FORMAT = "MMM d, yyyy HH:mm a";
private static final String EXPECTED_STRING_DATE = "Aug 1, 2018 12:00 PM";
private static Date date;
@BeforeClass
@ -34,8 +33,8 @@ public class DateToStringFormatterUnitTest {
public void whenDateConvertedUsingSimpleDateFormatToString_thenCorrect() {
DateFormat formatter = new SimpleDateFormat(DATE_FORMAT);
String formattedDate = formatter.format(date);
assertEquals(EXPECTED_STRING_DATE, formattedDate);
String expectedDate = "Aug 1, 2018 12:00 pm";
assertEquals(expectedDate, formattedDate);
}
@Test
@ -43,15 +42,15 @@ public class DateToStringFormatterUnitTest {
String formattedDate = DateFormat
.getDateTimeInstance(DateFormat.MEDIUM, DateFormat.SHORT, Locale.US)
.format(date);
assertEquals(EXPECTED_STRING_DATE, formattedDate);
String expectedDate = "Aug 1, 2018, 12:00 PM";
assertEquals(expectedDate, formattedDate);
}
@Test
public void whenDateConvertedUsingFormatterToString_thenCorrect() {
String formattedDate = String.format("%1$tb %1$te, %1$tY %1$tI:%1$tM %1$Tp", date);
assertEquals(EXPECTED_STRING_DATE, formattedDate);
String expectedDate = "Aug 1, 2018 12:00 PM";
assertEquals(expectedDate, formattedDate);
}
@Test
@ -62,7 +61,7 @@ public class DateToStringFormatterUnitTest {
.atZone(ZoneId.of("CET"))
.toLocalDateTime();
String formattedDate = ldt.format(fmt);
assertEquals(EXPECTED_STRING_DATE, formattedDate);
String expectedDate = "Aug 1, 2018 12:00 pm";
assertEquals(expectedDate, formattedDate);
}
}

67
core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntEncapsulationUnitTest.java Normal file
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@ -0,0 +1,67 @@
package com.baeldung.stringtoint;
import java.util.Arrays;
import java.util.List;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
class StringToIntEncapsulationUnitTest {
@Test
void whenConvertingIntToString_thenInvalidCasesReturnNull() {
List<TestData> testData = Arrays.asList(
new TestData("", null),
new TestData(null, null),
new TestData("23,56", null),
new TestData("2147483648", null),
new TestData("-2147483649", null),
new TestData("hello", null)
);
testData.forEach(data -> {
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerParseInt(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerValueOf(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.converStringToIntUsingOptional(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerDecode(data.input));
});
}
@Test
void whenConvertingIntToString_thenValidCasesReturnUnboxedInt() {
List<TestData> testData = Arrays.asList(
new TestData("23", 23),
new TestData("-23", -23)
);
testData.forEach(data -> {
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerParseInt(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerValueOf(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.converStringToIntUsingOptional(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingNumberUtils(data.input));
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingIntegerDecode(data.input));
});
}
@Test
void whenConvertingStringToIntUsingNumberUtils_ThenInValidConversionReturnIntegerMin() {
List<TestData> testData = Arrays.asList(
new TestData("", Integer.MIN_VALUE),
new TestData(null, Integer.MIN_VALUE),
new TestData("23,56", Integer.MIN_VALUE),
new TestData("2147483648", Integer.MIN_VALUE),
new TestData("-2147483649", Integer.MIN_VALUE),
new TestData("hello", Integer.MIN_VALUE)
);
testData.forEach(data ->
Assertions.assertEquals(data.expectedOutput, StringToIntEncapsulation.convertStringToIntUsingNumberUtils(data.input)));
}
public static class TestData{
String input;
Integer expectedOutput;
TestData(String input, Integer expectedOutput){
this.input = input;
this.expectedOutput = expectedOutput;
}
}
}