// Person.java
package unit01.quiz;
public abstract class Person{
    public abstract String talk();
} 
// Student.java 
package unit01.quiz;
public class Student extends Person{
    private final String name;
    private final double gpa; // grade point average, higher is better
    private final String subject; // study subject
    
    public Student(String name, double gpa, String subject){
       this.name = name; 
       this.gpa = gpa;
       this.subject = subject;
    }
    public String talk(){
       return name;
    }
    public String talk(String subject){
       return (name+" is studying "+subject);
    }
    
    public String learn(){
        return (name+" is studying "+subject);
      }
    public boolean evaluate(double gpaTest){
        if (this.gpa < gpaTest) return false;
        else return true;
    }
    public String getSubject(){
        return subject;
    }
    public double getGPA() {
        return gpa;
   }
}
// Main.java 
package unit01.quiz;
public class Main {
    public static void main(String[] args) {
        Student student = new Student("Paul",3.2, "WINF");
    
    }
}
       
Which code lines do NOT WORK OR DO NOT MAKE SENSE in main() (syntactically wrong or sentence makes not sense))?
1)    System.out.println("Student " + student.talk() + " is studying.");
2)    System.out.println("Student " + student.talk() + " is studying " + student.getSubject() + ".");
3)    System.out.println("Student " + student.talk() + " is studying " + student.getSubject(student.talk()) + ".");
4)    System.out.println("Student " + student.learn() + " is studying " + student.getSubject() + ".");
5)    System.out.println("Student " + student.talk() + " is studying " + student.getGPA() + ".");
6)    if (student.evaluate(2.0)) System.out.println(student.talk() + " has a better GPA than 2.0.");
7)    if (student.evaluate(2.0)) System.out.println(student.talk() + " has a worse GPA than 2.0.");
8)    System.out.println("Student " + student.talk(student.getSubject())+".");