How to press button to open another window

Need to call another call that opens another window without closing the current windows that called the app. And need this window to open slightly off so it does not cover the windows with the button that called it. When the button "Network device" is pressed I wanted to call application SubApp1.java as a new window that does not open up over the main app window.

MainAppWin3.java

Code java:

import javax.swing.*;
import java.awt.*;
 
public class MainAppWin3 extends JFrame {
 
 
AppEvent home = new AppEvent(this);
 
JPanel row1 = new JPanel();
JLabel startLabels = new JLabel("Current System");
TimePanel time = new TimePanel();
 
 
JPanel row2 = new JPanel();
JButton actionDevice = new JButton("Network Device");
JButton actionExit = new JButton("Exit");
 
public MainAppWin3() {
super("Toolbox");
setSize(700, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridLayout layout = new GridLayout(2, 1);
setLayout(layout);
 
// Add listeners
actionDevice.addActionListener(home);
actionExit.addActionListener(home);
 
FlowLayout layout1 = new FlowLayout(FlowLayout.LEFT, 5, 5);
row1.setLayout(layout1);
row1.add(startLabels);
row1.add(time);
add(row1);
 
FlowLayout layout2 = new FlowLayout(FlowLayout.CENTER, 10, 10);
row2.setLayout(layout2);
row2.add(actionDevice);
row2.add(actionExit);
add(row2);
 
 
setVisible(true);
}
public static void main(String[] args) {
MainAppWin3 frame = new MainAppWin3();
}
}

AppEvent.java

Code java:

import javax.swing.*;
import java.awt.event.*;
 
public class AppEvent implements ActionListener {
 
MainAppWin3 gui;
 
public AppEvent(MainAppWin3 in) {
gui = in;
}
 
public void actionPerformed(ActionEvent event) {
String command = event.getActionCommand();
if (command.equals("Network Device")) {
startNetworkDevice();
}
if (command.equals("Exit")) {
exitExit();
}
}
void startNetworkDevice() {
gui.actionDevice.setEnabled(false);
gui.actionExit.setEnabled(true);
}
void exitExit() {
gui.actionDevice.setEnabled(true);
gui.actionExit.setEnabled(true);
System.exit(0);
}
}

TimePanel.java

Code java:

import javax.swing.*;
import java.util.*;
 
public class TimePanel extends JPanel {
public TimePanel() {
super();
String currentTime = getTime();
JLabel time = new JLabel("Time: ");
JLabel current = new JLabel(currentTime);
add(time);
add(current);
}
String getTime() {
String time;
// get current time and date
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR_OF_DAY);
int minute = now.get(Calendar.MINUTE);
int month = now.get(Calendar.MONTH);
int day = now.get(Calendar.DAY_OF_MONTH);
int year = now.get(Calendar.YEAR);
 
String monthName = "";
switch (month) {
case (1):
monthName = "January";
break;
case (2):
monthName = "February";
break;
case (3):
monthName = "March";
break;
case (4):
monthName = "April";
break;
case (5):
monthName = "May";
break;
case (6):
monthName = "June";
break;
case (7):
monthName = "July";
break;
case (8):
monthName = "August";
break;
case (9):
monthName = "September";
break;
case (10):
monthName = "October";
break;
case (11):
monthName = "November";
break;
case (12):
monthName = "December";
}
time = monthName + " " + day + ", " + year + " " + hour + ":" + minute;
return time;
}
}

SubApp1.java

Code java:

import javax.swing.*;
import java.awt.*;
 
public class SubApp1 extends JFrame {
 
public SubApp1() {
super("Test Toolkit");
setSize(700, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
FlowLayout beginButtons = new FlowLayout();
setLayout(beginButtons);
JLabel startLabels = new JLabel("Current System");
TimePanel time = new TimePanel();
 
add(startLabels);
add(time);
 
setVisible(true);
}
 
public static void main(String[] args) {
SubApp1 StartWindow = new SubApp1();
}
}