Question

there is only one version of a student.student information is shown in the upper button

(in myJPanel1).

when the user clicks on the upper button in myJPanel1, then WhatsUp() is shown in the lower button (in myJPanel2).

The difference here is that you are required to:

do everything the in second panel, myJPanel2.

No changes in myJPanel1.java

Therefore:

You have to change one line (or at most 3 lines) in myJPanel.java (the panel that creates the two other panels)

A lot of changes in myJPanel2.java

NO changes in myJPanel1.java (of course there are changes in myJPanel1 screen, where the button b1 is located)

GIVEN CODE

app.java

public class app

{

public static void main(String args[])

{

myJFrame mjf = new myJFrame();

}

}

myJFrame,java

import java.awt.*;

import javax.swing.*;

public class myJFrame extends JFrame

{

public myJFrame()

{

super(“Communication Between Classes – Assignment”);

myJPanel mjp = new myJPanel();

add(mjp, “Center”);

setDefaultCloseOperation(EXIT_ON_CLOSE);

setSize(640, 480);

setVisible(true);

}

}

myJPanel.java

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class myJPanel extends JPanel

{

public myJPanel()

{

super();

setBackground(Color.gray);

setLayout(new BorderLayout());

myJPanel1 p1 = new myJPanel1();

myJPanel2 p2 = new myJPanel2();

student st1 = new student(“Kerry”,”Collins”,20);

add(p1, “North”);

add(p2, “Center”);

}

}

myJPanel1.java

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class myJPanel1 extends JPanel

{

JButton b1;

public myJPanel1()

{

super();

setBackground(Color.yellow);

b1 = new JButton(“student info will be here later …”);

add(b1);

}

}

myJPanel2.java

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class myJPanel2 extends JPanel

{

JButton b2;

public myJPanel2()

{

super();

setBackground(Color.pink);

b2 = new JButton(“whats Up will be shown here”);

add(b2);

}

}

student.java

import java.awt.*;

import javax.swing.*;

public class student

{

String firstName;

String lastName;

int age;

public student(String a, String b, int x)

{

super();

firstName = a;

lastName = b;

age = x;

}

String getInfo()

{

return “NAME = ” + firstName + ” ” + lastName + ” ” + “Age = ” + age;

}

String whatsUp()

{

double r = Math.random();

int myNumber = (int) (r * 3f); //comment: a random number between 0 and 2

String answer = “I don’t know”;

if (myNumber == 0)

{

answer = “searching the web”;

}

if (myNumber == 1)

{

answer = “doing Java”;

}

if (myNumber == 2)

{

answer = “Listening to endless lecture”;

}

return answer;

}

}

 

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