JTextField如何读取文本

Question

In my GUI.java class, I have the following function:

public void setChat(String text)
{
   chat.append(text);
}

public void getInput(String text)
{
   String read = input.getText();
}

I am trying to use my getInput() method to set a username I will be using for the rest of my code, but I just can't seem to read it in correctly from the TextField in my Client.java. I'm having a lot of trouble getting the original:

String username = gui.getInput();

(That certainly didn't work either). Can someone help me read in a TextField entry and assign it to my username String?

import java.io.*;
import java.net.*;

public class Client
{      
   public static void main(String [] args) throws IOException
   {
   GUI gui = new GUI();
   javax.swing.SwingUtilities.invokeLater(new Runnable()
   {
     public void run()
     {
        //GUI gui = new GUI();
     }
  }); 

  String username = "";      
  gui.setChat("  Enter the username you would like to use for the duration of the chat session.\n");
  if (username == "")
  {
     System.out.println("Press Any Key To Continue...");
     new java.util.Scanner(System.in).nextLine();
     gui.getInput(username);
     gui.setChat("  Your username is now: " + username + ".\n");
  }
 }
}

---

EDIT 1

GUI.java class:

String getInput(String text)
{
   return input.getText();
}

Client.java class:

  String username;
  gui.setChat("  Enter the username you would like to use for the duration of the chat session.\n");
  username = gui.getInput();

  System.out.println("Press Any Key To Continue...");
  new java.util.Scanner(System.in).nextLine();
  gui.setChat("  Your username is now: " + username + ".\n");

Errors:

Client.java:19: error: method getInput in class GUI cannot be applied to given types;
  username = gui.getInput();
                ^
required: String
found: no arguments
reason: actual and formal argument lists differ in length
1 error

Answer 1

try

public void getInput(){
    return input.getText();
}

then in the main

username = "" + gui.getInput();