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[BAEL-6956] string templates (#14825)

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Co-authored-by: Bhaskar <bhaskar.dastidar@freshworks.com>
This commit is contained in:
Bhaskar Ghosh Dastidar 2023-09-25 06:02:12 +05:30 committed by GitHub
parent b172cbf69b
commit c689708383
4 changed files with 178 additions and 19 deletions
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37
core-java-modules/core-java-21/pom.xml
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@ -12,23 +12,22 @@
<version>0.0.1-SNAPSHOT</version>
</parent>
<!-- <build>-->
<!-- <plugins>-->
<!-- <plugin>-->
<!-- <groupId>org.apache.maven.plugins</groupId>-->
<!-- <artifactId>maven-compiler-plugin</artifactId>-->
<!-- <configuration>-->
<!-- <source>{maven.compiler.source.version}</source>-->
<!-- <target>{maven.compiler.target.version}</target>-->
<!-- </configuration>-->
<!-- </plugin>-->
<!-- </plugins>-->
<!-- </build>-->
<!-- <properties>-->
<!-- <maven.compiler.source.version>21</maven.compiler.source.version>-->
<!-- <maven.compiler.target.version>21</maven.compiler.target.version>-->
<!-- <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>-->
<!-- </properties>-->
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>21</source>
<target>21</target>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<maven.compiler.source.version>21</maven.compiler.source.version>
<maven.compiler.target.version>21</maven.compiler.target.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>

37
core-java-modules/core-java-21/src/main/java/com/baeldung/stringtemplates/StringCompositionTechniques.java Normal file
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@ -0,0 +1,37 @@
package com.baeldung.stringtemplates;
import java.text.MessageFormat;
public class StringCompositionTechniques {
String composeUsingPlus(String feelsLike, String temperature, String unit) {
return "Today's weather is " + feelsLike + ", with a temperature of " + temperature + " degrees " + unit;
}
String composeUsingStringBuffer(String feelsLike, String temperature, String unit) {
return new StringBuffer().append("Today's weather is ")
.append(feelsLike)
.append(", with a temperature of ")
.append(temperature)
.append(" degrees ")
.append(unit)
.toString();
}
String composeUsingStringBuilder(String feelsLike, String temperature, String unit) {
return new StringBuilder().append("Today's weather is ")
.append(feelsLike)
.append(", with a temperature of ")
.append(temperature)
.append(" degrees ")
.append(unit)
.toString();
}
String composeUsingFormatters(String feelsLike, String temperature, String unit) {
return String.format("Today's weather is %s, with a temperature of %s degrees %s", feelsLike, temperature, unit);
}
String composeUsingMessageFormatter(String feelsLike, String temperature, String unit) {
return MessageFormat.format("Today''s weather is {0}, with a temperature of {1} degrees {2}", feelsLike, temperature, unit);
}
}

56
core-java-modules/core-java-21/src/main/java/com/baeldung/stringtemplates/StringTemplateExamples.java Normal file
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@ -0,0 +1,56 @@
package com.baeldung.stringtemplates;
import static java.lang.StringTemplate.RAW;
import static java.util.FormatProcessor.FMT;
public class StringTemplateExamples {
String interpolationUsingSTRProcessor(String feelsLike, String temperature, String unit) {
return STR
. "Today's weather is \{ feelsLike }, with a temperature of \{ temperature } degrees \{ unit }" ;
}
String interpolationOfJSONBlock(String feelsLike, String temperature, String unit) {
return STR
. """
{
"feelsLike": "\{ feelsLike }",
"temperature": "\{ temperature }",
"unit": "\{ unit }"
}
""" ;
}
String interpolationWithExpressions() {
return STR
. "Today's weather is \{ getFeelsLike() }, with a temperature of \{ getTemperature() } degrees \{ getUnit() }" ;
}
String interpolationWithTemplates() {
StringTemplate str = RAW
. "Today's weather is \{ getFeelsLike() }, with a temperature of \{ getTemperature() } degrees \{ getUnit() }" ;
return STR.process(str);
}
String interpolationOfJSONBlockWithFMT(String feelsLike, float temperature, String unit) {
return FMT
. """
{
"feelsLike": "%1s\{ feelsLike }",
"temperature": "%2.2f\{ temperature }",
"unit": "%1s\{ unit }"
}
""" ;
}
private String getFeelsLike() {
return "pleasant";
}
private String getTemperature() {
return "25";
}
private String getUnit() {
return "Celsius";
}
}

67
core-java-modules/core-java-21/src/test/java/com.baeldung.stringtemplates/StringTemplatesUnitTest.java Normal file
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@ -0,0 +1,67 @@
package com.baeldung.stringtemplates;
import org.junit.Assert;
import org.junit.Test;
public class StringTemplatesUnitTest {
@Test
public void whenStringConcat_thenReturnComposedString() {
StringCompositionTechniques stringCompositionTechniques = new StringCompositionTechniques();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", stringCompositionTechniques.composeUsingPlus("pleasant", "25", "Celsius"));
}
@Test
public void whenStringBuffer_thenReturnComposedString() {
StringCompositionTechniques stringCompositionTechniques = new StringCompositionTechniques();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", stringCompositionTechniques.composeUsingStringBuffer("pleasant", "25", "Celsius"));
}
@Test
public void whenStringBuilder_thenReturnComposedString() {
StringCompositionTechniques stringCompositionTechniques = new StringCompositionTechniques();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", stringCompositionTechniques.composeUsingStringBuilder("pleasant", "25", "Celsius"));
}
@Test
public void whenStringFormatter_thenReturnComposedFormattedString() {
StringCompositionTechniques stringCompositionTechniques = new StringCompositionTechniques();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", stringCompositionTechniques.composeUsingFormatters("pleasant", "25", "Celsius"));
}
@Test
public void whenMessageFormatter_thenReturnComposedFormattedString() {
StringCompositionTechniques stringCompositionTechniques = new StringCompositionTechniques();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", stringCompositionTechniques.composeUsingMessageFormatter("pleasant", "25", "Celsius"));
}
@Test
public void whenUsingStringTemplateSTR_thenReturnInterpolatedString() {
StringTemplateExamples templateExamples = new StringTemplateExamples();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", templateExamples.interpolationUsingSTRProcessor("pleasant", "25", "Celsius"));
}
@Test
public void whenUsingMultilineStringTemplateSTR_thenReturnInterpolatedString() {
StringTemplateExamples templateExamples = new StringTemplateExamples();
Assert.assertEquals("{\n" + " \"feelsLike\": \"pleasant\",\n" + " \"temperature\": \"25\",\n" + " \"unit\": \"Celsius\"\n" + "}\n", templateExamples.interpolationOfJSONBlock("pleasant", "25", "Celsius"));
}
@Test
public void whenUsingExpressionSTR_thenReturnInterpolatedString() {
StringTemplateExamples templateExamples = new StringTemplateExamples();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", templateExamples.interpolationWithExpressions());
}
@Test
public void whenUsingExpressionRAW_thenReturnInterpolatedString() {
StringTemplateExamples templateExamples = new StringTemplateExamples();
Assert.assertEquals("Today's weather is pleasant, with a temperature of 25 degrees Celsius", templateExamples.interpolationWithTemplates());
}
@Test
public void whenUsingExpressionFMT_thenReturnInterpolatedString() {
StringTemplateExamples templateExamples = new StringTemplateExamples();
Assert.assertEquals("{\n" + " \"feelsLike\": \"pleasant\",\n" + " \"temperature\": \"25.86\",\n" + " \"unit\": \"Celsius\"\n" + "}\n", templateExamples.interpolationOfJSONBlockWithFMT("pleasant", 25.8636F, "Celsius"));
}
}