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How do I resolve this error using Paths.of?

I have been trying many of the examples provided and have yet to be successful. Here is the code I am currently trying, but getting an error in Eclipse on Paths.of (the of is underlined in red) that says: "rename in file".
String content;
try {
content = Files.readAllLines(Paths.of("C:", "Calcs.txt"));
} catch (IOException e1) {
e1.printStackTrace ();
}
System.out.println (content);

First it is not possible, if you get a list as return type, to assign this to a string. So you must write:
List<String> content;
Second regarding to the Java 8 documentation there is no method of available for this class. You can use the method get like this:
List<String> content = Files.readAllLines(Paths.get("C:", "Calcs.txt"));
Otherwise there exists a method of in the Path class since Java 11. Therefore you can write something like that:
List<String> content = Files.readAllLines(Path.of("C:", "Calcs.txt"));

You're probably looking for Paths.get:
String content;
try {
content = String.join("\n", Files.readAllLines(Paths.get("/home/hassan", "Foo.java")));
} catch (IOException e1) {
e1.printStackTrace ();
}

Read and Write file in java whilst keeping the special characters

After reading and writing the file, the bullet points get replaced with symbolic unreadable text "�". Here is the code:
String str = FileUtils.readFileToString(new File(sourcePath), "UTF-8");
nextTextFile.append(redactStrings(str, redactedStrings));
FileUtils.writeStringToFile(new File(targetPath), nextTextFile.toString());
Link to sample file
generated file with funny characters

I checked it out on Windows and if the source file is encoded in UTF-8, the following code will produce the desired output to the console and to a file, which is then encoded in UTF-8 as well, making use of java.nio:
public static void main(String[] args) {
Path inPath = Paths.get(sourcePath);
Path outPath = Paths.get(targetPath);
try {
List<String> lines = Files.readAllLines(inPath, StandardCharsets.UTF_8);
lines.forEach(line -> {
System.out.println(line);
});
Files.write(outPath, lines, StandardCharsets.UTF_8);
} catch (IOException e) {
e.printStackTrace();
}
}
Please note that the source file has to be encoded in UTF-8, otherwise this may throw an IOException stating something like Input length = 1. Play around with the StandardCharsets if it does not meet your requirements or make sure the encoding of the source file is UTF-8.

Disable auto-escaping when creating an HTML file with PrintWriter

I don't know why this is so much harder than expected.
I'm trying to create an HTML file with Java, and it is not working. The code creates a file, but the contents are not what I inputted.
My simplified code is as follows:
File file = new File("text.html");
PrintWriter out = null;
try {
out = new PrintWriter(file);
out.write("<b>Hello World!</b>");
} catch (Exception e) { }
out.close();
Instead of the contents "Hello World!", the HTML file contains the escaped form "<b>Hello World!</b>". When I open the file with TextWrangler, I see that Java has automatically escaped all my angle brackets into < and >, which breaks all the formatting and is NOT what I want.
How do I avoid this?

how do i get the data from a database and store it into a text file?

I am new to databases in Java and i am trying to export the data from 1 table and store it in a text file. At the moment the code below writes to the text file however all on one line? can anyone help?
My Code
private static String listHeader() {
String output = "Id Priority From Label Subject\n";
output += "== ======== ==== ===== =======\n";
return output;
}
public static String Export_Message_Emails() {
String output = listHeader();
output +="\n";
try {
ResultSet res = stmt.executeQuery("SELECT * from messages ORDER BY ID ASC");
while (res.next()) { // there is a result
output += formatListEntry(res);
output +="\n";
}
} catch (Exception e) {
System.out.println(e);
return null;
}
return output;
}
public void exportCode(String File1){
try {
if ("Messages".equals(nameOfFile)){
fw = new FileWriter(f);
//what needs to be written here
//fw.write(MessageData.listAll());
fw.write(MessageData.Export_Message_Emails());
fw.close();
}
}

Don't use a hard coded value of "\n". Instead use System.getProperty("line.separator"); or if you are using Java 7 or greater, you can use System.lineSeparator();

Try String.format("%n") instead "\n".

Unless you're trying to practice your Java programming (which is perfectly fine of course!), you can export all the data from one table and store it in a file by using the SYSCS_UTIL.SYSCS_EXPORT_TABLE system procedure: http://db.apache.org/derby/docs/10.11/ref/rrefexportproc.html

I'm gonna assume you are using Windows and that you are opening your file with notepad. If that is correct then it is not really a problem with your output but with the editor you are viewing it with.
Try a nicer editor, ie. Notepad++
Do as the other answers suggest and use System.getProperty("line.separator"); or similar.
Use a Writer implementation such as, PrintWriter.
Personally I prefer "\n" over the system line separator, which on Windows is "\r\n".
EDIT: Added option 3

Insert boolean in RTF file using java

I have no idea how can I insert boolean sign into RTF document from java programm. I think about √ or ✓ and –. I tried insert these signs to clear document and save it as *.rtf and then open it in Notepad++ but there is a lot of codes (~160 lines) and I can not understand what is it. Do you have any idea?

After a short search I found this:
Writing unicode to rtf file
So a final code version would be:
public void writeToFile() {
String strJapanese = "日本語✓";
try {
FileOutputStream fos = new FileOutputStream("test.rtf");
Writer out = new OutputStreamWriter(fos, "UTF8");
out.write(strJapanese);
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}

Please read about RTF
√ or ✓ and – are not available in every charset, so specify it. If yout output in UTF-8 (and i advise you to do so, check here on how to do this). You might need to encode the sign aswell, check Wikipedia