import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Apl extends JFrame{
    protected JButton ad;
    protected JTextField tf[]= new JTextField[2];
    protected List lst;

    protected JPanel contr, plst;

    protected AdSt adSt;
    protected Student prs[]=new Student[0];

    Apl(int x, int y, int ln, int ht){
        this.setLayout(new BorderLayout());
        this.setBounds(x, y, ln, ht);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Student's directory - version 1");

        contr = new JPanel(new FlowLayout());
        plst = new JPanel(new FlowLayout());

        ad = new JButton("add");
        contr.add(ad);
        tf[0]= new JTextField("name?",10);
        tf[1]= new JTextField("note?",3);
        contr.add(tf[0]);
        contr.add(tf[1]);
        ad.addActionListener(adSt=new AdSt());
        add("North",contr);

        lst = new List(10);
        plst.add(lst);
        add("Center",plst);
        revalidate();
    }
    class AdSt implements ActionListener{
        public void actionPerformed(ActionEvent e ){
            Student s;
            int nt;
            String n=tf[0].getText();
            try{
                nt=Integer.parseInt(tf[1].getText());
            }
            catch(NumberFormatException ex){
                tf[1].setText("note?");
                return;
            }
            Student help[]= new Student[prs.length+1];
            System.arraycopy(prs, 0, help, 0, prs.length);
            help[help.length-1]= s=new Student(n,nt);
            prs=help; tf[0].setText("name?");tf[1].setText("note?");
            lst.add(""+s);
            revalidate();
        }
    }
    public static void main(String [] arg){
        Apl apl=new Apl(20,20,400,300);
    }

	public static List<Student> sort(Student[] students) {
    	List<Student> studentsList = new ArrayList();

    	for (int i = 0; i < students.length; i++) {
        	studentsList.add(students[i]);
    	}
    	Collections.sort(studentsList);
    	return studentsList;
	}

	public static Student getStudentByName(Student[] students, String nameOfStudent){
		for (int i = 0; i < students.length; i++) {
        	if(students[i].Name = nameOfStudent){
				return students[i];
			}
    	}
		return null;
	}
}