<!-- Add the following dependency to your pom.xml,  -->
<!-- replacing LATEST with specific version as required  -->

<dependency>
    <groupId>com.github.javaparser</groupId>
    <artifactId>javaparser-symbol-solver-core</artifactId>
    <version>LATEST</version>
</dependency>
                

// Create a Java object representation of your code

CompilationUnit compilationUnit
		= StaticJavaParser.parse("class A { }");
Optional<ClassOrInterfaceDeclaration> classA
		= compilationUnit.getClassByName("A");
            

// Look for fields which are public and not static

compilationUnit.findAll(FieldDeclaration.class).stream()
        .filter(f -> f.isPublic() && !f.isStatic())
        .forEach(f -> System.out.println("Check field at line " +
            f.getRange().map(r -> r.begin.line).orElse(-1)));
                            

// Ensure all abstract classes have a name starting with Abstract

compilationUnit.findAll(ClassOrInterfaceDeclaration.class).stream()
        .filter(c -> !c.isInterface()
                && c.isAbstract()
                && !c.getNameAsString().startsWith("Abstract"))
        .forEach(c -> {
            String from = c.getNameAsString();
            String to = "Abstract" + from;
            System.out.println("Renaming class " + from + " into " + to);
            c.setName(to);
        });
                            

// Create source code on the fly

CompilationUnit compilationUnit = new CompilationUnit();
ClassOrInterfaceDeclaration myClass = compilationUnit
        .addClass("MyClass")
        .setPublic(true);
myClass.addField(int.class, "A_CONSTANT", PUBLIC, STATIC);
myClass.addField(String.class, "name", PRIVATE);
String code = myClass.toString();