Write MVCTester. java. When the program starts, the initial screen displays a button labeled "add", a blank text area, and a text field. A user places a line in the text field and clicks on the add button. Then, the text area displays the line. Each time the user enters a new line in a text field and clicks on the add button, the text area is updated displaying previously entered lines and the new line. The following picture shows the snapshot of the program output right after two lines are added. snapshot To get a credit, the following requirements have to be satisfied.1. The program follows the MVC model.
2. Listeners are implemented in an anonymous class.
3. Model is a separate class from the client (test) program.
4. Indication of which part of your program serves as model, controller or view.

Kindly note that, you're to replace "at" with shift 2 as the text editor can't take the symbol

Explanation:

import java.awt.event.*;  

import java.awt.geom.Area;

import javax.swing.*;

class MVCTester implements ActionListener{

JButton b; //button

JTextField t1; //textfiled

JTextArea area; //text area

MVCTester(){

JFrame f=new JFrame("Button Example");

//button

b=new JButton("add");  

b.setBounds(0,0,125,27);  

f.add(b);  

b.addActionListener(this);  

//textfiled

t1=new JTextField();  

t1.setBounds(0,161,125,24);  

f.add(t1);

//textarea

area=new JTextArea();  

area.setBounds(0,28,123,130);  

f.add(area);

area.setColumns (17);

area.setLineWrap (true);

area.setWrapStyleWord (false);

f.setSize(125,225);

f.setLayout(null);  

f.setVisible(true);

}

"at"Override

public void actionPerformed(ActionEvent arg0) {

Control c=new Control(area,t1,b);

}  

}  

class Control {

Control(JTextArea area,JTextField t1,JButton b){

//simple logic getting text of text area adding text of textfiled and setting the text to text area

area.setText(area.getText()+t1.getText()+"\n");

t1.setText("");

}

}

public class Modal{

public static void main(String[] args) {  

MVCTester be=new MVCTester();

}

}

import java.awt.event.*;

import java.awt.geom.Area;

import javax.swing.*;

class MVCTester implements ActionListener{

JButton b; //button

JTextField t1; //textfiled

JTextArea area; //text area

MVCTester(){

JFrame f=new JFrame("Button Example");

//button

b=new JButton("add");

b.setBounds(0,0,125,27);

f.add(b);

b.addActionListener(this);

//textfiled

t1=new JTextField();

t1.setBounds(0,161,125,24);

f.add(t1);

//textarea

area=new JTextArea();

area.setBounds(0,28,123,130);

f.add(area);

area.setColumns (17);

area.setLineWrap (true);

area.setWrapStyleWord (false);

f.setSize(125,225);

f.setLayout(null);

f.setVisible(true);

}

atOverride (use the at symbol in your code)

public void actionPerformed(ActionEvent arg0) {

Control c=new Control(area,t1,b);

}

}

class Control {

Control(JTextArea area,JTextField t1,JButton b){

//simple logic getting text of text area adding text of textfiled and setting the text to text area

area.setText(area.getText()+t1.getText()+"\n");

t1.setText("");

}

}

public class Modal{

public static void main(String[] args) {

MVCTester be=new MVCTester();

}

}

Explanation:

This is a MVCTester.java. program. In this program, we started with the initial screen that displays a button labeled "add", a blank text area, and a text field. A user places a line in the text field and clicks on the add button. Then, the text area displays the line.

The program follows the MVC model. Also Listeners are implemented in an anonymous class. Its Model is a separate class from the client (test) program.

After implementing the function, the executed program performed optimally by producing the required output.

answer(d) sequencing and iteration;