Wednesday 21 July 2021

javapoet tutorial

Javapoet is a library to generate .java source files.

 

Where can I use source generation?

a.   It is helpful while interacting with metadata files like database schemas, xsd, json schema etc.,

b.   Helpful while doing annotation processing.

 

Dependencies used

<dependencies>
    <dependency>
        <groupId>com.squareup</groupId>
        <artifactId>javapoet</artifactId>
        <version>1.13.0</version>
    </dependency>
</dependencies>

 

You can download all the applications of this tutorial from below github link.

https://github.com/harikrishna553/java-libs/tree/master/javapoet-demo

      hello world application
      Add code to a method
      Add statements to the method
      Add control flow statements
      Generate method definitions with some configurations
      Generate if-else if ladder
      $T to refer types
      Define collections
      static imports
      $N: Refer another generated declaration by name
      Generate try-catch block
      $L: Emit a literal value in the output
      $s: emit a string
      Working with CodeBlock
      CodeBlock: Relative arguments
      CodeBlock: Positional Arguments
      CodeBlock: Named arguments
      Define an abstract class
      CodeBlock: Named arguments
      Define an abstract class
      Define a constructor
      add fields to the class
      Define parameters using ParameterSpec
      Add parameters using addParameter method
      Add generic parameters to a constructor
      Add generic parameters to a method
      Define interface
      Define enums
      Define fields to an enum constant
      enum: override super class methods of enum value
      Define Anonymous inner classes
      Add an annotation
      Set properties on annotations
      Add java documentation
      Define inner class
      Define nested class
      Add a field of type inner class
      Add static block
      Add initiaizer block
      Add a super class
      Add generic super class
      Add generic type to a class
      Add generic super class
      Add generic type to a class
      Define wildcard method parameters
      implement an interface

 

 

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