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joplin notion extension/Web Development/Java/Extras.md

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+Extras
+- Alternaive of String.format in java
+```java
+ String sql = "SELECT ${columns} FROM Users WHERE Lastname=?"
+     .replace("${columns}", "name");
+```
+- Maven
+  Maven Build Lifecycle Phases
+
+Maven follows a build lifecycle consisting of several phases. When you run mvn package, Maven executes all preceding phases in the lifecycle:
+```text
+    validate: Checks if the project is correct and all necessary information is available.
+    compile: Compiles the source code.
+    test-compile: Compiles the test source code.
+    test: Runs the tests using the compiled test code.
+    package: Packages the compiled code and resources into a JAR, WAR, or other artifact formats.
+```
+If you run `mvn test`, Maven will perform only up to the test phase. It does not proceed to the package phase, so no artifact will be created.
+ When creating any maven project directory structure should be like this
+```text
+my-project/
+├── pom.xml
+├── src/
+    ├── main/
+        ├── java/
+            └── com/
+                └── example/
+                    └── MyClass.java
+        ├── resources/
+            └── config.properties
+    ├── test/
+        ├── java/
+            └── com/
+                └── example/
+                    └── MyClassTest.java
+        ├── resources/
+            └── test-config.properties
+
+```
+- Creating a jar file
+   - First compile the java code to some directory say `bin`
+      `javac -d bin main.java` (-d bin to create a directory)
+	- `jar cf proj.jar -C bin .` (c for creative archve , f to specify name of jar file, -C bin . to change to bin directory from current one)
+	- for creating executable jar manifest file needs to be created too so create a file with name `MANIFEST.MF` an type following 
+		```makefile
+		Manifest-Version: 1.0
+		Main-Class: HelloWorld
+		```
+		Then add it in jar with
+		`jar cfm proj.jar MANIFEST.MF -C bin .`
+	- `jar tf proj.jar` : to verify it
+	- `java -jar proj.jar`
+ 
+
+handling JSON in java
+- https://www.geeksforgeeks.org/parse-json-java/