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    <p>This is quite different to your original implementation. But I believe it does what you want it to. There's probably a better way of implementing it, but I'm only implementing based on the information you've given me. Hope you understand it all...</p> <p><br/>UseCourse:</p> <pre><code>import javax.swing.JOptionPane; public class UseCourse { public UseCourse() { CollegeCourse college; // Collect all the necessary data first to determine whether it is a lab course or not. String dept = JOptionPane.showInputDialog(null, "Enter Department"); String courseNumString = JOptionPane.showInputDialog(null, "Enter Course Number"); int courseNum = Integer.parseInt(courseNumString); String credString = JOptionPane.showInputDialog(null, "Enter Credits"); int cred = Integer.parseInt(credString); // Now that we have the info we can ask the question. if (dept.equals("BIO") | dept.equals("CHM") | dept.equals("CIS") | dept.equals("PHY")) {college = new LabCourse(dept, courseNum, cred);} else {college = new LabCourse(dept, courseNum, cred);} college.display(); } public static void main(String[] args) {new UseCourse();} } </code></pre> <p>CollegeCourse:<Br></p> <pre><code>import javax.swing.JOptionPane; public class CollegeCourse { protected String dept; protected int courseNum; protected int cred; protected int fee; protected int Charge = 120; protected int labfee; public CollegeCourse(String dept, int courseNum, int cred) { this.dept = dept; this.courseNum = courseNum; this.cred = cred; fee = cred * Charge; } public void display(){ JOptionPane.showMessageDialog(null, dept + courseNum + "\nNon-lab Course" + "\n" + cred +" Credits" + "\nTotal fee is $" + fee); } } </code></pre> <p><br/>LabCourse:</p> <pre><code>import javax.swing.JOptionPane; public class LabCourse extends CollegeCourse { public LabCourse(String dept, int courseNum, int cred) {super(dept, courseNum, cred);} public void display() { fee += 50; JOptionPane.showMessageDialog(null, dept + courseNum + "\nLab Course" + "\n" + cred +" Credits" + "\nTotal fee is $" + fee); } } </code></pre>
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    1. COi want to use an if-else method so i could filter the input in the inputdepartment and prompt the displayLabCourse if the user inputs a certain department. how can i do that?
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    2. COAm I correct in assuming not every CollegeCourse has a LabCourse? In which case how do you differentiate all the courses into the two sets of LabCourse and No LabCourse?
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    3. COit will be differentiated base on the user's input in the department. The LabCourse will only be used if the user inputs: BIO, CHM, CIS, or PHY in the department field
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