Java Utililty Methods BufferedReader Read

InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(resourcePath);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
try {
    String line;
    while ((line = br.readLine()) != null) {
        sb.append(line);
    br.close();
    is.close();
} catch (IOException io) {
    throw new RuntimeException("Some problem retrieving a file from the classpath...");
return sb.toString();

String line;
double[] data;
List<Double> list = new ArrayList<Double>();
BufferedReader reader = null;
try {
    reader = new BufferedReader(new InputStreamReader(filePath));
    while ((line = reader.readLine()) != null) {
        list.add(Double.parseDouble(line.trim()));
...

BufferedReader r = new BufferedReader(new FileReader(f));
StringBuilder builder = new StringBuilder();
int c;
while ((c = r.read()) != -1) {
    builder.append((char) c);
return builder.toString();

try (BufferedReader br = new BufferedReader(new FileReader(f))) {
    StringBuilder sb = new StringBuilder();
    String line = br.readLine();
    while (line != null) {
        sb.append(line);
        sb.append(System.lineSeparator());
        line = br.readLine();
    return sb.toString();
} catch (FileNotFoundException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
return null;

StringBuilder builder = new StringBuilder();
BufferedReader reader = new BufferedReader(new FileReader(f));
boolean first = true;
for (String line = reader.readLine(); line != null; line = reader.readLine(), first = false) {
    if (!first)
        builder.append("\n");
    builder.append(line);
return builder.toString();

StringBuilder contents = new StringBuilder();
try {
    BufferedReader input = new BufferedReader(new FileReader(f));
    try {
        String line = null;
        while ((line = input.readLine()) != null) {
            contents.append(line);
            contents.append(System.getProperty("line.separator"));
...

BufferedReader in = new BufferedReader(new FileReader(f));
ArrayList list = new ArrayList();
String line;
while ((line = in.readLine()) != null)
    list.add(line);
return (String[]) list.toArray(new String[0]);

StringBuilder b = new StringBuilder();
BufferedReader in = new BufferedReader(new FileReader(f));
for (int c; (c = in.read()) != -1; b.append((char) c))
    ;
in.close();
return b.toString();

BufferedReader br = new BufferedReader(new FileReader(f));
StringBuilder sb = new StringBuilder();
String str;
while ((str = br.readLine()) != null) {
    sb.append(str);
    sb.append("\n");
br.close();
...

StringBuffer fileData = new StringBuffer(1000);
BufferedReader reader = new BufferedReader(new FileReader(f));
char[] buf = new char[1024];
int numRead = 0;
while ((numRead = reader.read(buf)) != -1) {
    String readData = String.valueOf(buf, 0, numRead);
    fileData.append(readData);
    buf = new char[1024];
...