We Keep Coding

Seperating ArrayList items to a regular keyword group

I started Java for plugin codding in minecraft. now I'm trying to add role names as prefix and show it in chat.
ArrayList<String> userRoles = new ArrayList<String>();
if(player.hasPermission("chat.rank.admin")){
userRoles.add("[Admin]");
} if(player.hasPermission("chat.rank.vip")) {
userRoles.add("[VIP]");
}
event.setFormat(userRoles<>(1) + " " + player.getDisplayName() + "§7: " + msg);
// In this line, the expected output is "[Admin] user: msg" or both [Admin] [VIP] user: msg"
// But it gives "([Admin],[VIP]) user: msg"
// I'm sure it has a simple solution but as I said, I'm new here. thanks from now

It seems like you are trying to create a list which only stores one value.
You might want to try creating a function that get the rank name of the player outside of your PlayerChatEvent listener.
Here's a demo code:
public String getPlayerRankName(Player p){
if (p.hasPermission("chat.rank.admin"))
return "[Admin]";
else if (p.hasPermission("chat.rank.vip"))
return "[VIP]";
else
return "";
}
And in your PlayerChatEvent event listener, call this function in your chat line:
event.setFormat(getPlayerRankName(event.getPlayer()) + " " + player.getDisplayName() + "§7: " + msg);

getInt Function Doesn't Return Anything

I am currently trying to making a custom rules plugin (for minecraft) and I am trying to see if the player has something activated which I stored in the config file. It is in the listener class (which calls the config from the main). Here is my code:
#EventHandler
public void onEvent(AsyncPlayerChatEvent e) {
Player player = e.getPlayer();
if (config.getInt("EditingLine." + player.getName().toLowerCase()) == 1) {
int line = 0;
try {
line = Integer.parseInt(e.getMessage());
} catch (Exception b) {
player.sendMessage(ChatColor.RED + "Invalid Number.");
config.set("EditingLine." + player.getName().toLowerCase(), 0);
}
if (!(line == 0)) {
config.set("EditingLine." + player.getName().toLowerCase(), 0);
config.set("EditingText." + player.getName().toLowerCase(), 1);
e.setCancelled(true);
player.sendMessage(ChatColor.GRAY + "[" + ChatColor.GOLD + "Custom Rules" + ChatColor.GRAY + "]" + ChatColor.GREEN + " Enter the text you would now like on that line.");
}
}
}
The, config.getInt() function in the if then statement currently returns nothing. This may be happening because the config in the Listener Class is actually calling a custom made config, called 'playerdata.yml' and not the actual 'config.yml'. If there is any easier way to write this script, also let me know. I'm trying to make this as simple as I can.

The answer has been solved by merging my two configuration files together.

Why won't "\t" create a tab?

I want the "Module Code = " and "Result = " to be separated by a tab but whenever I run the code below it literally just outputs
"Module Code = Biology\tResult = 40.0"
public String toString()
{
return "Module Code = " + moduleCode + "\t" + "Result = " + result;
}

The problem is that you're viewing the value of the produced string in the BlueJ window. That window is good for debugging purposes, but it won't exhibit the same behavior that a proper output device would, especially with respect to characters such as newline, tabulation, etc. Those characters will still appear with their escape sequences, just like you typed them in your source code.
In other words, your toString() method is fine and it works as intended. If you want to see its results formatted properly, don't view them using BlueJ -- print them somewhere else. The console is a good choice:
System.out.println(module.toString());

Why won't “\t” create a new line?
well, that is because “\t” is a tabulation not a new line “\n”
if you need a new line try instead
return "Module Code = " + moduleCode + "\n" + "Result = " + result;

How to save information from JTable to a File?

Here is my case:
So far my group and I, managed to read information from an external file and place it in a JTable. But we need an update button. So we guess we should take all the information from JTable after editting something inside it, and replace it with the current information in the same file. So we kind of think we have to overwrite the old file.
So far we got this: (for int i... is a part of the code but can't get it inside the grey area :P)
for(int i = 0; i < model.getRowCount(); i++) {
p += model.getValueAt(i, 0) + " "
+ model.getValueAt(i, 1) + " "
+ (Integer) model.getValueAt(i, 2) + " "
+ model.getValueAt(i, 3) + " "
+ (Integer)model.getValueAt(i, 4) + " "
+ model.getValueAt(i, 5) + " "
+ model.getValueAt(i, 6) + " "
+ model.getValueAt(i, 7) + " "
+ (Integer)model.getValueAt(i, 8) + "\n";
}
// Update File
SaveMember sm = new SaveMember();
sm.update(p);
Inside our SaveMember.java we got:
public void update(String x) throws Exception {
File f = new File("Members/Members.txt");
PrintStream output = new PrintStream(f);
output.print(x);
So by now when we go and change the data and press the button update, it doesn't do anything at all, and doesn't replace the old data with the new.. Thanks for reading! :)

I'm not sure. If you have double checked that your code is executed at all (maybe you forgot to attach the ActionListener to your button - we all do that from time to time...) try flush the output stream and close the stream afterwards.

First check if your code in the for loop is executed at all. Set a breakpoint after the for loop and inspect the string p. If you are not familiar with debugging, print the string to the console with System.out.println(p).
If your code is NOT executed: Check why the method your code is in is not called. Perhaps you forgot to attach an action listener to your update button or the action listener has an early return under some circumstances.
If your code is executed: What do you do with the exception that is thrown by the method update? Make sure to log it with your logger or print it to the console (again via System.out.println(exc)). If you get a FileNotFoundException the path to the file is not correct.

How to SELECTIVELY bold text in a TextView

I have this statement:
s = s + "Id: " + lc.getID() + " Name: " + lc.getName() + "\n"
+ " Phone Number: " + lc.getPhone() + " Email: " + lc.getEmail() + "\n"
+ " Description: " + lc.getDescription() + "\n\n"
that prints this out:
Id: 1 Name: Eric
Phone Number: 8294038 Email: foo#gmail.com
Description: Cool guy Eric
I want to Bold only the titles (Id, Name, etc).
I tried this:
s = s + Html.fromHtml(" <b> Id: </b>" + lc.getID() + " <b> Name: </b>" + lc.getName() + "\n"
+ " Phone Number: " + lc.getPhone() + " Email: " + lc.getEmail() + "\n"
+ " Description: " + lc.getDescription() + "\n"
+ "\n\n");
But not only does it not bold, but it takes away the new lines (\n). Any ideas on how to get this done? Thanks.

Html.fromHtml() returns a Spanned object, designed to be put directly into a TextView or similar widget.
A Spanned is not a String.
By doing s = s + Html.fromHtml(...), you are saying "please parse this HTML into a Spanned, then throw out all the formatting to give me a String that I can concatenate onto some other String". That's not what you want -- you want to keep the formatting. But a Java String does not have formatting, and so ordinary string concatenation has no way to keep it.
Beyond that, as Manishika pointed out, newlines are ignored in HTML anyway, as you use HTML elements for vertical whitespace.
Your options include:
Generate a complete HTML snippet -- including whatever it is you are trying to concatenate it to -- and then use Html.fromHtml() on the entire thing. You may wish to use a template engine (e.g., jmustache) for that, or String.format(). Or, use StringBuilder, rather than lots of + operations (less memory churn, faster performance). Be sure to use <br/> or <p> for your line breaks/paragraph delimiters.
Use SpannableStringBuilder to assemble the string and its formatting from component parts.
Use TextUtils.concat(s, Html.fromHtml(...)) instead of s + Html.fromHtml(...), as concat() will maintain the spans that implement the formatting. While the implementation of Spanned returned by fromHtml() is not a String, both it and String are a CharSequence, and hence work with concat().

It will require a little bit of parsing on your end, but you definitely want to look into SpannableStrings.
For example, let's say I have the following string:
String s = "How now brown cow";
I would then turn it into a SpannableString by simply feeding the string to the constructor as follows:
SpannableString ss = new SpannableString(s);
From there you need your stylization with the spanned area. For this, I'll just use SubscriptSpan, though if you wish to make your own you can simply make your own class extending CharacterStyle and override the updateDrawState(TextPaint ds) method. The following is how you can set you span:
/ *
* the first argument is the span effect you want, the second and third
* are the start and end indices, respectively, and the last argument is
* for setting a flag, which you probably won't need.
*/
ss.setSpan(new SubscriptSpan(), 0, 2, 0);
And now you can just put your string straight into the TextView and it should appear how you want, like so:
myTextView.setText(ss);