Java Utililty Methods InputStream to String

Reader reader = new InputStreamReader(in);
StringWriter writer = new StringWriter();
char[] buf = new char[1000];
while (true) {
    int n = reader.read(buf, 0, 1000);
    if (n == -1) {
        break;
    writer.write(buf, 0, n);
return writer.toString();

try (BufferedReader buffer = new BufferedReader(new InputStreamReader(is))) {
    return buffer.lines().collect(Collectors.joining("\n"));
} catch (IOException e) {
    throw new RuntimeException("Could not convert InputStream to String ", e);

char[] b = new char[4096];
try {
    for (int n; (n = reader.read(b)) != -1;) {
        builder.append(new String(b, 0, n));
} catch (IOException e) {
    e.printStackTrace();

char[] buf = new char[4096];
int len;
InputStreamReader reader = null;
StringWriter writer = null;
try {
    reader = new InputStreamReader(in, "UTF-8");
    writer = new StringWriter();
    while ((len = reader.read(buf)) >= 0) {
...

StringBuilder sb = new StringBuilder();
InputStreamReader is = new InputStreamReader(in, "UTF-8");
BufferedReader br = new BufferedReader(is);
String read = br.readLine();
while (read != null) {
    sb.append(read);
    read = br.readLine();
return sb.toString();

final BufferedReader br = new BufferedReader(new InputStreamReader(in));
final StringBuffer sb = new StringBuffer();
String line;
while ((line = br.readLine()) != null) {
    sb.append(line).append("\n");
return sb.toString();

Scanner scanner = (optionalCharsetName == null) || (optionalCharsetName.length == 0)
        || (optionalCharsetName[0] == null) ? new Scanner(inputStream)
                : new Scanner(inputStream, optionalCharsetName[0]);
String content = scanner.useDelimiter("\\A").hasNext() ? scanner.next() : "";
return content;

final char[] buffer = new char[bufferSize];
final StringBuilder out = new StringBuilder();
try (Reader in = new InputStreamReader(is, "UTF-8")) {
    for (;;) {
        int rsz = in.read(buffer, 0, buffer.length);
        if (rsz < 0)
            break;
        out.append(buffer, 0, rsz);
...

if (stream == null)
    return null;
final StringBuilder str = new StringBuilder(128);
String coding = "UTF-8";
int c = stream.read();
if (c == '#') { 
    str.append((char) c);
    while ((c = stream.read()) != -1 && c != 10) {
...

BufferedReader reader = new BufferedReader(new InputStreamReader(stream, charset));
StringBuilder text = new StringBuilder();
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
    text.append(line);
return text.toString();