Java Parser iterate over methods of a class

Question

I would like to know if exists such thing like java parser (like parser xml). I mean from a String like this

String javaToParse = "public class x{void foo(){...} void baar(){...}}"

I could for example get the body (in string format) from foo or the body of all methods etc..

I have some like that

public class Some {
    @PostConstruct
    public void init1() {
        //some to do
    }
    @PostConstruct
    public void init2() {
        //some to do2
    }
    @PostConstruct
    public void init3() {
        //some to do3
    }
//..more..
}

Here there are one or more @PostConstruct This class is autogenerated and I cannot modified it manually.

I would like to iterate all @PostConstruct methods and put all his bodies into only one @Postcontruct method and export to file and get this:

public class Some {
    @PostConstruct
    public void init() {
        //some to do
        //some to do2
        //some to do3
    }
}

I see that it's possible to do this getting that file as String and operate manually with fors and search manually but maybe there are librearies to do it. EDIT:

Resolved with JavaParser If somebody has similar problem here my solution:

public static void createUniquePostContruct(File InputFile,File outputFile) throws FileNotFoundException {
        //get class to modified
        FileInputStream in = new FileInputStream(ficheroEntradaJava);
        // parse the file
        CompilationUnit cu = JavaParser.parse(in);
        //store methods with @PostContruct
        List<MethodDeclaration> methodsPost = new ArrayList<>();
        //iterate over all class' methods
        cu.accept(new VoidVisitorAdapter<Void>() {
            @Override
            public void visit(MethodDeclaration method, Void arg) {
                //if this method has @PostConstruct
                if (method.getAnnotationByName("PostConstruct").isPresent()) {
                    methodsPost .add(method);
                }
            }
        }, null);
        //delete all methods with @PostConstruct
        methodsPost.forEach((method) -> method.remove());
        //add a unique @PostConstruct method using body of anothers @PostConstruct methods
        MethodDeclaration uniqueMethodPostConstruct = new MethodDeclaration(EnumSet.of(Modifier.PUBLIC), new VoidType(), "init");
        uniqueMethodPostConstruct.addAnnotation("PostConstruct");
        BlockStmt bodyUniqueMethodPostConstruct= new BlockStmt();
        metodosPost.forEach(method-> {
            method.getBody().get().getStatements().forEach(statement -> {
                bodyUniqueMethodPostConstruct.addStatement(statement);
            });
        });
        metodoUnicoPostConstruct.setBody(bodyUniqueMethodPostConstruct);
        //get main class and put our method
        Optional<ClassOrInterfaceDeclaration> clazz = cu.getClassByName(ficheroEntradaJava.getName().split("\\.")[0]);
        clazz.get().addMember(uniqueMethodPostConstruct);

        System.out.println(cu.toString());

        //write to file
        try (PrintWriter out = new PrintWriter(outputFile)) {
            out.println(cu.toString());
        } catch (FileNotFoundException ex) {
            Logger.getLogger(ParserMetodos.class.getName()).log(Level.SEVERE, null, ex);
        }
    }