I'm doing some past exam papers in preparation for a forthcoming exam, and have come across this question, and I'm not sure how to solve it, I've written a for-each loop with an if statement but I'm not sure what the header would be and what to return. Any help would be great. Thanks.
The question:
An ArrayList named classList is used to store Student objects.
Write code for a method that determines whether or not data for a student with given forename and surname is present in classList.
Something like:
boolean lala( Student given ) {
for( Student s : classList ) {
if( s.getForename().equals( given.getForename() ) &&
s.getSurname().equals( given.getSurname() ) ) {
return true;
}
}
return false;
}
static boolean isPresentInList(List<Student> students, String forename, String surname)
{
// loop thru students and check forename and surname and if there is a match,
// return true
// outside of loop return false (no match).
...
}
Something like this?
private static ArrayList<Student> findStudents(ArrayList<Student> students, Student student) {
ArrayList<Student> result = new ArrayList<Student>();
for (Student obj: students) {
if (obj.getFirstname().equals(student.getFirstname()) &&
obj.getLastname().equals(student.getLastname())) {
result.add(obj);
}
}
return result;
}
class Student {
private String mFirstname;
private String mLastname;
public Student() {
}
public Student(String fistName, String lastName) {
mFirstname = fistName;
mLastname = lastName;
}
public String getFirstname() {
return mFirstname;
}
public void setFirstname(String mFirstname) {
this.mFirstname = mFirstname;
}
public String getLastname() {
return mLastname;
}
public void setLastname(String mLastName) {
this.mLastname = mLastName;
}
}
public class Main {
public static void main(String[] args) {
ArrayList<Student> studentList = new ArrayList<Student>();
studentList.add(new Student("eder", "quiñones"));
studentList.add(new Student("eder", "orteag"));
studentList.add(new Student("lucia", "germes"));
studentList.add(new Student("chespirito", "gomez"));
System.out.println(findAllStudentsByName(studentList, "eder"));
System.out.println(findAllStudentsByName(studentList, "lucia"));
System.out.println(findAllStudentsByLastName(studentList, "germes"));
System.out.println(findStudents(studentList, new Student("eder", "quiñones")));
}
private static ArrayList<Student> findAllStudentsByName(ArrayList<Student> students, String firstName) {
ArrayList<Student> result = new ArrayList<Student>();
for (Student obj: students) {
if (obj.getFirstname().equals(firstName)) {
result.add(obj);
}
}
return result;
}
private static ArrayList<Student> findAllStudentsByLastName(ArrayList<Student> students, String lastName) {
ArrayList<Student> result = new ArrayList<Student>();
for (Student obj: students) {
if (obj.getLastname().equals(lastName)) {
result.add(obj);
}
}
return result;
}
}
booleans are great for that.