🚀 go-pugleaf

I am trying to use a JTextField for the user to enter an IP address.
The user will click the JButton which then will run a routine that
will get the Internet Host Name.  It can't get it to work. I get an
error that 'unreported exception: java.net.UnknownHostException; must
be caught or declared to be thrown.'  Here is the applicable code
segments.  Can anyone tell me what I missed????  Len

import java.io.*;
import java.net.*;
.
.
  JTextField jTextField1 = new JTextField();
  JTextField jTextField3 = new JTextField();
  JButton jButton1 = new JButton();
.
.
  jButton1.addActionListener(new java.awt.event.ActionListener() {.
.
.
      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
.
.
  jPanel3.add(jTextField1, new XYConstraints(176, 14, 117, -1));
  jPanel3.add(jTextField3, new XYConstraints(176, 52, 201, -1));
.
. 
 public void jButton1_actionPerformed(ActionEvent e) {
        String myIP = jTextField1.getText();
        InetAddress inet = InetAddress.getByName(myIP);
        jTextField3.setText(inet.getHostAddress());
  }