56 lines
No EOL
2 KiB
Markdown
56 lines
No EOL
2 KiB
Markdown
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/ |