My method of addStudent() is not working correctly. I\'m trying to put an Object

Question

 My method of addStudent() is not working correctly.  I'm trying to put an Object of Students to an array. Everytime the user adds a new student it stores them in an array.  But what's happening right now with my code is it just stores the newest student the user inputs. How can I correct this?  thanks.   

   public class Project1 {      static int size = 20;     static Student[] students = new Student[size];      public static void main(String[] args) {          while(true)         {             System.out.println("Student Database");             System.out.println("================");             System.out.println("Commands:  ");             System.out.println(""a" - add a student");             System.out.println(""f" - find a student");             System.out.println(""d" - delete a student");             System.out.println(""p" - print list");             System.out.println(""e" - system exit");             System.out.println();              Scanner scanner = new Scanner(System.in);             String input = scanner.next();              switch (input) {                 case "a":                     addStudent();                     break;                 case "f":                     findStudent();                     break;                 case "d":                     deleteStudent();                     break;                 case "p":                     printStudent(students);                     break;                 case "e":                     System.exit(0);                     break;             }//switch           }//while      }//main      public static void addStudent()     {          Scanner scan = new Scanner(System.in);          System.out.println("Enter last name: ");         String lastname = scan.next();          System.out.println("Enter first name: ");         String firstname = scan.next();          System.out.println("Enter id no: ");         String id = scan.next();          for(int i=0; i<students.length; i++)         {             students[i] = new Student(lastname, firstname, id);         }          

 public static void printStudent(Student[] students) {     for(Student s: students)     {         System.out.println(s);     } } 

      } 

Explanation / Answer

It is suggested to declare the number of students outside your main or use a larger MAX value and also make sure there is a variable which counts the actual number of array indices that are filled.

static int AR_MAX=20
static student[] students; //the same that is defined in the program//
static int nStudents; //this need to be added to keep a track of the number of entries//

students = new Student[AR_MAX]
nStudents=0;
//Then follow these lines of code to add a student//

students[nStudents]=new Student();
nStudents++;

The above code would limit the number of entries to 20 only.

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