Thread: New guy needs help

I am trying to make a gui that i will be able to add ips to and remove them then if i hit the button it it writes the ip to a .txt then if i hit anorther button it also writes to another .txt that has this format and it replaces the ip in "lastServer" (aka) 15th row

music:0.0
sound:0.014084507
invertYMouse:false
mouseSensitivity:0.5
viewDistance:0
guiScale:0
bobView:true
anaglyph3d:false
advancedOpengl:false
fpsLimit:1
difficulty:2
fancyGraphics:true
ao:true
skin:Default
lastServer:192.168.1.1
key_key.forward:17
key_key.left:30
key_key.back:31
key_key.right:32
key_key.jump:57
key_key.sneak:42
key_key.drop:16
key_key.inventory:18
key_key.chat:20
key_key.fog:33

import java.awt.FlowLayout;
import javax.swing.JFrame;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JOptionPane;
 
public class chsv extends JFrame{
 
	private static final long serialVersionUID = 1L;
		public JTextField pi;
		public JButton in;
		public JLabel item1;
		public String itme5;
		public chsv(){
			super("~~~America Fuck Yea~~~");
			setLayout(new FlowLayout());
 
			item1= new JLabel("The ips");
			add(item1);
			JTextField pi = new JTextField("enter ip", 20);
			add(pi);
			JButton in =new JButton("add");
 
			thhnd hnd = new thhnd();
			pi.addActionListener(hnd);
			in.addActionListener(hnd);
 
 
 
 
 
 
 
 
		}
 
		public class thhnd implements ActionListener{
 
			public void actionPerformed(ActionEvent event){
				String item4 = "";
				if(event.getSource()==pi){
						item4=String.format("field 1: %s", event.getActionCommand());
								JOptionPane.showMessageDialog(null, item4);
											class wrt {
												public void main(String[] args) throws IOException{
 
													BufferedWriter sn = new BufferedWriter(new FileWriter("/Users/Kingkong/Desktop/ff.txt"));
													String fn = "";
													sn.write(fn);
												    sn.close();
													JOptionPane.showMessageDialog(null, "the ip" +fn, "~~", JOptionPane.PLAIN_MESSAGE);	
 
												}
 
												}
 
 
 
 
 
				}
 
				JOptionPane.showMessageDialog(null, item4);
 
 
 
 
			}
 
		}}

main is a static method.