Problem in array output, pls help!

Question

i made an array:
public class Estudyante
     String studentNo;
     String studentName;
     String address;
     String phone;
     String email;
     public void displayDetails()
          System.out.println(studentNo);
          System.out.println(studentName);
          System.out.println(address);
          System.out.println(phone);
          System.out.println(email);
public class StudentFinder
     //define the variables of the class
     Estudyante estObjects[];
     //initialize the variables
     public StudentFinder()
          //creating an array of 3 estudyantes
          estObjects = new Estudyante[3];
          //creating objects of all the three elements in an array
          for(int ctr = 0; ctr !=estObjects.length;ctr++)
               estObjects[ctr] = new Estudyante();
          //assigning test values
          //estudyante 1 details
          estObjects[0].studentNo = "0001";
          estObjects[0].studentName = "Rez";
          estObjects[0].address = "Pasig";
          estObjects[0].phone = "111-1111";
          estObjects[0].email = "[email protected]";
          //estudyante 2 details
          estObjects[1].studentNo = "0002";
          estObjects[1].studentName = "Reza";
          estObjects[1].address = "Manila";
          estObjects[1].phone = "222-2222";
          estObjects[1].email = "[email protected]";
          //estudyante 3 details
          estObjects[2].studentNo = "0003";
          estObjects[2].studentName = "Reza Ric";
          estObjects[2].address = "Malate";
          estObjects[2].phone = "333-3333";
          estObjects[2].email = "[email protected]";
     //declare the method of the class
     public void displayFinder()
          //add the code for displaying estudyante details
          for (int ctr = 0;ctr != estObjects.length;ctr++)
               estObjects[ctr].displayDetails();
               //the displayDetails() method is present in the Estudyante class
     //code the main() method
     public static void main(String args[])
          StudentFinder finderObject;
          finderObject = new StudentFinder();
          finderObject.displayFinder();
problem:
when i run this in command prompt, it displays all the 3 sets of details
question:
how will i display the set of details i want and not all of them?
eg: i only want the details of studentNo = "0001"
so in command prompt i execute
java StudentFinder 0001
how will i be able to get the details for studentNo = "0001" only and how will i display "No such student" if the studentNo asked for is not in any of the details.

Answer 1

Hi KikiMon,
In your displayFinder() method you'll have to take an argument, specifying which Student to display. Like this:
public void displayFinder(String target)
for (int ctr = 0;ctr != estObjects.length;ctr++)
if(estObjects[ctr].studentNo.equals(target)) {
estObjects[ctr].displayDetails();
An in your main you'll have to forward a commandline argument like this:
public static void main(String args[])
StudentFinder finderObject;
finderObject = new StudentFinder();
finderObject.displayFinder(args[0]);
Later,
Klaus