Merge pull request #22 from brunobaiano/tip-19

tip-19

_posts/2023-11-24-daily-tip-19.md

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+---
+title: "Daily tip #19"
+date: 2023-11-24
+---
+
+## Tip of the day #19
+
+Use the joining collector and stop to write loops to concatenate strings.
+
+
+### What is it?
+
+The joining collector is a new collector that was introduced in Java 8. 
+It is a special collector that is used to concatenate strings. 
+
+We have 3 different ways to use it:
+
+1 - join all strings without any delimiter
+
+```java
+// 1
+String result = Stream.of("a", "b", "c")
+    .collect(Collectors.joining());
+// abc
+```
+
+2 - join all strings with a delimiter
+
+```java
+// 2
+String result = Stream.of("a", "b", "c")
+    .collect(Collectors.joining(", "));
+// a, b, c
+```
+
+3 - join all strings with a delimiter and a prefix and suffix
+
+```java
+// 3
+String result = Stream.of("a", "b", "c")
+    .collect(Collectors.joining(", ", "[", "]"));
+// [a, b, c]
+```
+Important to note that all then join the strings in the same order that they are in the stream.
+
+They are also null-safe, so if you have a null value in the stream, it will be ignored.
+
+After today, do not use more StringBuilders to concatenate strings anymore, use the joining collector instead.
+
+### How to
+
+Take a look in [repo-tip-19](https://github.com/brunobaiano/tip-of-the-day/tree/main/tip-19) to see a real example of today's tip.
+
+Because @QuarkusTest and @ParameterizedTest has some issues, I created a new repo to show the example using Spring Boot.
+Here we can use records.
+[repo-tip-19-spring](https://github.com/brunobaiano/tip-of-the-day/tree/main/tip-19-spring) 

tip-19-spring/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

tip-19-spring/.mvn/wrapper/maven-wrapper.properties

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+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar