Create a JFrame with 3 panels (top, middle, bottom). In the middle panel, there will be 3 JTextFields to hold arg1, arg2, arg3 (all strings). The bottom panel is to have the 4 operation buttons including a Quit button. The program is suppose to calculate numbers.

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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class hw3_skh extends JFrame {

JTextField tf1 = new JTextField(20);
JTextField tf2 = new JTextField(20);
JTextField tf3 = new JTextField(20);
       JLabel [] arg = new JLabel[3];
/*String a = tf1.getText();
String b = tf2.getText();
String c = tf3.getText();
Double n = Double.parseDouble(a);
    JButton button1 = new JButton("+");
    JButton button2 = new JButton("-");
    JButton button3 = new JButton("*");...
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