Java Utililty Methods FileReader Create

try {
    FileReader reader = new FileReader(f);
    StringBuilder sb = new StringBuilder();
    try {
        char[] buf = new char[4096];
        for (int cnt = reader.read(buf); cnt > -1; cnt = reader.read(buf))
            sb.append(buf, 0, cnt);
    } finally {
...

String[] result = null;
ArrayList<String> work = new ArrayList<String>();
if (file != null) {
    BufferedReader in = null;
    try {
        in = new BufferedReader(new FileReader(file));
        String line = null;
        while ((line = in.readLine()) != null) {
...

FileReader fr = new FileReader(file);
char[] cbuf = new char[(int) file.length()];
fr.read(cbuf);
String content = new String(cbuf);
fr.close();
return content;

BufferedReader reader = new BufferedReader(new FileReader(file));
String line;
String fileContent = "";
while ((line = reader.readLine()) != null) {
    fileContent += line.trim();
reader.close();
return fileContent;
...

FileReader in = new FileReader(file);
StringWriter out = new StringWriter();
copyReader(in, out);
in.close();
out.close();
return out.toString();

return readTextFile(file, null);

if (!file.isFile()) {
    throw new IllegalArgumentException("File not found: " + file.getAbsolutePath());
if (!file.canRead()) {
    throw new IllegalArgumentException("File not readable: " + file.getAbsolutePath());
String content = null;
BufferedReader br = null;
...

ArrayList lines = new ArrayList();
BufferedReader in = new BufferedReader(new FileReader(file));
String line;
while ((line = in.readLine()) != null) {
    lines.add(line);
in.close();
return (String[]) lines.toArray(new String[lines.size()]);
...

FileReader fr = new FileReader(file);
char[] cbuf = new char[(int) file.length()];
fr.read(cbuf);
String content = new String(cbuf);
fr.close();
return content;

BufferedReader reader = new BufferedReader(new FileReader(file));
return reader.lines().map(line -> Arrays.asList(line.split("\\t"))).collect(Collectors.toList());