1. Assignment 7 User Defined Classes Part 2

2. Question 1
Which is the wrong way to call the Class method public static long getNumStudents() in the Class student from the main method inside of student?
A) int x = getNumStudents();
B) Student s = new Student();
int x = s.getNumStudents();
C) long x = Student.getNumStudents();
D) long x = this.getNumStudents();

3. Question 2 What is the problem with the following code?
public class Student{ int studentID; public static getStudent(int id) { Student s = new Student(); s.studentID = id; if(id == 0) return null; else return s; } public static void main(String args[]) for(int x = 0; x < 100; x++) Student s = getStudent(x); System.out.println(s.studentID);
What is the problem with the following code?
A) Incorrect Return type in getStudent()
B) Invalid Assignment to Student s
C) Incorrect way to call getStudent()
D) s is not Initialized

4. Question 3
When can a method in a class be called without using a class or variable name before it?
When a class method is being called from an instance method
When a class method is being called from another class method
C) When an instance method is being called from a class method
When an instance method is being called from an instance method
B and D
A B and D

5. Question 4
Which overloaded method should be removed for the following to run in java?
Method 2 or 4
Method 3 and 5
Method 2 and 3
Method 5
public class Example{
void methodA(int a){}
void methodA(int a, int b){}
void methodA(int b, float c){}
void methodA(int b, int a){}
void methodA(float c, int a, int b){} }

6. Question 5 What is the problem with the following code?
A) Incompatible variable passed to call this(id / 2)
B) Can’t call a constructor after first line of another constructor
C) Can’t use more than one constructor type in the class Student
D) Can’t pass more than one variable to a constructor
public class Student{
int studentID;
String name;
public Student(int id, String name) {
this(id / 2);
this(name); }
public Student(int id)
studentID = id;
public Student(String name)
this.name = name;