Java Utililty Methods InputStream Create

final ImageInputStream inStream = ImageIO.createImageInputStream(file);
if (inStream == null)
    return null;
return inStream;

try {
    return new FileInputStream(file);
} catch (FileNotFoundException e) {
    return null;

InputStream is = null;
if (file.exists()) {
    is = file.toURI().toURL().openStream();
} else {
    if (createFile) {
        file.createNewFile();
        is = file.toURI().toURL().openStream();
    } else {
...

byte[] bin = getBytes(obj);
return new ByteArrayInputStream(bin);

Thread curThread = Thread.currentThread();
ClassLoader loader = curThread.getContextClassLoader();
return loader.getResourceAsStream(fileName);

return clazz.getResourceAsStream("/" + clazz.getName().replace('.', '/') + ".java");

try {
    return new ByteArrayInputStream(content.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
    throw new RuntimeException("Problem generating input stream");

final String theData = data;
return new InputStream() {
    final String data = theData;
    int position = 0;
    public int read() throws EOFException {
        if (position < data.length())
            return data.charAt(position++);
        return -1;
...

File file = null;
FileInputStream fin = null;
try {
    file = new File(filename);
    if (file != null && file.isFile()) {
        fin = new FileInputStream(file);
        return fin;
    return null;
} catch (IOException ex) {
    fin = null;
    throw new RuntimeException(ex);

return new FileInputStream(fileName);