CODE EXAMPLE FOR JAVA

javaparser

public static void main(String[] args) throws Exception {
    // creates an input stream for the file to be parsed
    FileInputStream in = new FileInputStream("test.java");

    CompilationUnit cu;
    try {
        // parse the file
        cu = JavaParser.parse(in);
    } finally {
        in.close();
    }

    // change the methods names and parameters
    changeMethods(cu);

    // prints the changed compilation unit
    System.out.println(cu.toString());
}

private static void changeMethods(CompilationUnit cu) {
    List<TypeDeclaration> types = cu.getTypes();
    for (TypeDeclaration type : types) {
        List<BodyDeclaration> members = type.getMembers();
        for (BodyDeclaration member : members) {
            if (member instanceof MethodDeclaration) {
                MethodDeclaration method = (MethodDeclaration) member;
                changeMethod(method);
            }
        }
    }
}

private static void changeMethod(MethodDeclaration n) {
    // change the name of the method to upper case
    n.setName(n.getName().toUpperCase());

    // create the new parameter
    Parameter newArg = ASTHelper.createParameter(ASTHelper.INT_TYPE, "value");

    // add the parameter to the method
    ASTHelper.addParameter(n, newArg);
}