# Package: com.pnfsoftware.jeb.core.units.code.java
Description: Types used to manipulate `dexdec`\-generated \(Dex decompiler\) Java Abstract Syntax Tree \(AST\) objects. dexdec returns [Java units](com.pnfsoftware.jeb.core.units.code.java.IJavaSourceUnit) built upon the interfaces defined in this package. Users can use this API to write custom AST optimizers, that will be run by `dexdec` in later phases of code decompilation. Interfaces and classes/enums in this package start with `IJava...` or `J...`, respectively. 

 `dexdec` AST optimizer plugins may be written in Python or Java. 

 A sample skeleton plugin, in Python:  

```

 #?type=dexdec-ast
 from com.pnfsoftware.jeb.core.units.code.java import AbstractJOptimizer
 
 class JOptSamplePython(AbstractJOptimizer):
   def perform(self):
     return 0  # no optimization is performed
 
```
  

 The same sample plugin, in Java:  

```

 //?type=dexdec-ast
 import com.pnfsoftware.jeb.core.units.code.java.AbstractJOptimizer;
 
 public class JOptSampleJava extends AbstractJOptimizer {
     // note: implicit no-arg constructor is calling super()
     
     @Override
     public int perform() {
         // no optimization performed
         return 0;
     }
 }
 
```
  Refer to the sub\-directory `coreplugins/`, located in the JEB installation folder, for examples.
 Additional resources: refer to the User Manual and Technical Blogs, at https://www.pnfsoftware.com.