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How do I change the value of a java Path object?

Below, I am trying to change the value of the Path object there using the setSoundPath() method. I cannot find any documentation to say this is possible.
I am trying to create a class that will create a copy of a file at a specified path and put the copy in the specified folder. I need to be able to change the name of the path though, because I want to create the sound object with an initial placeholder file path.
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.io.IOException;
import javafx.beans.property.StringProperty;
import javafx.beans.property.SimpleStringProperty;
class Scratch {
public static class Sound extends Object{
private Path there;
StringProperty tests = new SimpleStringProperty(this, "test", "");
public Sound(){
this.there = Paths.get("C:\\Users\\HNS1Lab.NETWORK\\Videos\\JuiceWRLD.mp3");
}
public void setSoundPath(String SoundPath) {
this.tests.setValue(SoundPath);
this.there = Paths.get(this.tests.toString());
}
}
public static void main(String[] args) {
Sound test = new Sound();
test.setSoundPath("C:\\Users\\HNS1Lab.NETWORK\\Music\\Meowing-cat-sound.mp3");
test.copySound();
System.out.println("Path: " + test.getSoundPath().toString());
}
}

They are immutable:
Implementations of this interface are immutable and safe for use by
multiple concurrent threads.
(from: https://docs.oracle.com/javase/7/docs/api/java/nio/file/Path.html)
You can create new Path objects that point to your path.

How to create/use/import a custom made Method on Java

Like the in-built Math class, there are a couple of methods that one can use without importing the Math class. e.g
int io = (int) Math.random();
and notice the import region: no MATH whatsoever
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
but seeing, Math set doesn't have everything i needed, i created mine in a new class, but i can't seem to figure out what to do so i can be able to use it.
Taking a hint from the Math.java file, I've made my class final and my methods static but no avail..
Here's an excerpt of my code
package customops.Sets;
/**
*
* #author Kbluue
*/
public final class SetOpz {
public SetOpz(){}
public static int setMax(int[] set){
int out = set[0];
for(int i=1; i<set.length; i++){
out = Math.max(out, set[i]);
}
return out;
}
how do i use just the import command without having to copy and paste the SetOpz class in the DTL package?

You don't need to import Math explicitly because it is included by default. To use your own code you will have to import it. If you're using IntelliJ or Eclipse or some other smart IDE it will offer to import it for you automatically. Otherwise add a import statement at the top:
import customops.Sets.SetOpz;

You can import your method wherever you want to use with the following import statement
import static customops.Sets.SetOpz.setMax;

Getting info from an array that is in another JPanel

I am storing some info in an ArrayList that is in a JPanel. I want to access this info from a JFrame so that I can print the contents of the ArrayList.
How do I do this?
This is what i have tried so far:
package projektarbete;
import java.awt.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.util.ArrayList;
public class Spelet extends javax.swing.JPanel {
ArrayList<String> Resultat = new ArrayList<>();
.....
if(gameOver == true || vinst == true){
btnTillbakaTillMeny.setVisible(true);
int klick = antalKlick;
String namn = txfNamn.getText();
//Integer.toString(klick);
String klickString = klick+"";
String score = namn+"\t"+klickString;
Resultat.add(score);
That was the JPanel and the info is stored in the ArrayList called Restultat.
This is how I am trying to retrieve the info from the JFrame:
package projektarbete;
import javax.swing.JFrame;
public class Instruktioner extends javax.swing.JFrame {
//private final Meny Meny = new projektarbete.Meny();
private static void close() {
// throw new UnsupportedOperationException("Not supported yet.");
}
public Instruktioner() {
initComponents();
Spelet Resultat = new Spelet();
jTextArea1.setText(Resultat);
}
The thing is that NetBeans is underlining Resultat in jTextArea1.setText(Resultat);
Any ideas?

You cannot put a Resultat object as a parameter to setText(), because that method does not Accept a parameter of that type. If you look at the javadoc for the method, you will see what type(s) it takes (there may be more than one 'signature' for the method, each signature taking a different combination of types).
I think what you want to do is have a class and then an object that holds the data for your program. It will have the necessary methods for setting and obtaining data, and for calculating things that need calculation. Then, any object that is going to present information to the user (panel, frame, whatever) will need to have a reference to the class holding the data, and can call methods to get what it needs.
This is the very fundamental idea behind "model-view-controller" -- a *separation of concerns", where the logic for handling data is separated from the logic for displaying that data. It helps in the common cases where you need to change the presentation but the data handling itself is ok.

setText() is waiting for a string, but you gave it an ArrayList

Managing files in Java

I know C++ at a decent level and I am trying to learn java. This will be a silly question but I cannot figure out how to import a .java file into another. I am at Eclipse IDE and in my project I have two files:
FileReader.java
Entry.java
I want to import the Entry.java in the other file but no matter what I do I get an error. Can you help me? Thx in advance.
FileReader.java :
import java.io.*;
class FileReader {
public static void main(String[] args) throws Exception {
System.out.println("Hello, World");
Entry a(10,"a title","a description");
a.print();
}
}
Entry.java:
public class Entry{
int ID;
String title;
String description;
public Entry(int id, String t,String d){
ID=id;
title=t;
description=d;
}
public void print(){
System.out.println("ID:"+ID);
System.out.println("Title:"+title);
System.out.println("Description:"+description);
}
}
At this state I get an error that Entry cannot be resolved as a variable. So I believe that it is related to the import.

Firstly
Entry a(10,"a title","a description");
should be
Entry a = new Entry (10,"a title","a description");
If Entry is in the same package then you will not need to import it.
If Entry is in a different package, say com.example then you will need to do
Either
import com.example.Entry;
or
import com.example.*;
The second import will import all classes in the com.example package - usually not such a good thing.

You need new Entry
The new keyword creates the new object
Entry a = new Entry(10,"a title","a description")
a.print();
An Entry object is created with the a reference with the above instantiation.
For the import part of your question, if two files are in the same package, no import is needed. If you Entry class was in a different package than your FileReader class, then you would need to import mypackage.Entry

Try
Entry a = new Entry(/*args*/);
And if you need to import the class, then use the absolute name (package+class) and put it after import above the class declaration
import com.example.you.Entry;

In Eclipse you can do Ctrl+Shift+O to resolve all imports.

Merge into Java code

Using a sample from xSocket which will run xSocketHandler as a new process, I want to customize and moving all of these code into other java file, can I copy public class xSocketDataHandler implements IDataHandler and paste into different filename say main.java?
import java.io.IOException;
import java.nio.BufferUnderflowException;
import java.nio.channels.ClosedChannelException;
import org.xsocket.*;
import org.xsocket.connection.*;
public class xSocketDataHandler implements IDataHandler
{
public boolean onData(INonBlockingConnection nbc) throws IOException, BufferUnderflowException, ClosedChannelException, MaxReadSizeExceededException
{
try
{
String data = nbc.readStringByDelimiter("\0");
//nbc.write("Reply" + data + "\0");
nbc.write("+A4\0");
if(data.equalsIgnoreCase("SHUTDOWN"))
xSocketServer.shutdownServer();
}
catch(Exception ex)
{
System.out.println(ex.getMessage());
}
return true;
}
}

No, you can't do that without reducing the visibility of xSocketDataHandler to default. If you don't want to do that, your file name should be xSocketDataHandler.java
You must be having class xSocketDataHandler in a file of the same name already since it is public. You could move other non public classes in this file to Main.java instead.

A public class will need to be in a file named according to the class, so in this case it would be xSocketDataHandler.java.
Convention is also to name java classes starting with an upper-case letter, so it would be public class XSocketDataHandler and file XSocketDataHandler.java. This isn't required, though.