You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: java_dnd.m
    path of file: ./repos/bspm/thirdparty/dicm2nii
    
    the code of the file until where you have to start completion: function java_dnd(jObj, dropFcn)
% Set Matlab dropFcn for java object, like JavaFrame or JTextField.

% 170421 Xiangrui Li adapted from dndcontrol class by Maarten van der Seijs:

    
function java_dnd(jObj, dropFcn)
% Set Matlab dropFcn for java object, like JavaFrame or JTextField.

% 170421 Xiangrui Li adapted from dndcontrol class by Maarten van der Seijs:
% https://www.mathworks.com/matlabcentral/fileexchange/53511

if ~exist('MLDropTarget', 'class')
    pth = fileparts(mfilename('fullpath'));
    javaclasspath(pth); % dynamic for this session
    fid = fopen(fullfile(prefdir, 'javaclasspath.txt'), 'a+');
    if fid>0 % static path for later sessions: work for 2013+?
        cln = onCleanup(@() fclose(fid));
        fseek(fid, 0, 'bof');
        classpth = fread(fid, inf, '*char')';
        if isempty(strfind(classpth, pth)) %#ok<*STREMP> % avoid multiple write
            fseek(fid, 0, 'bof');
            fprintf(fid, '%s\n', pth);
        end