OBP2 - v9

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;

public class ProzorKlijent extends JFrame implements ActionListener{

    private Container c;
    private Socket s;
    private BufferedReader in;
    private PrintWriter out;
    private String komanda = "reg";

    public ProzorKlijent(){
        setSize(300,500);
        setTitle("Vezba 10 - Potapanje brodova");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        c = getContentPane();
        dodajKomponente();
        setVisible(true);
    }

    private void dodajKomponente() {

        JMenuBar jMenuBar = new JMenuBar();
        JMenu meniProgram = new JMenu("Program");
        meniProgram.add("Snimi").addActionListener(this);

        JCheckBoxMenuItem checkBoxMenuItem = new JCheckBoxMenuItem("Konekcija sa serverom");
        // Osluškivač koji čeka isključivo promenu stanja:
        checkBoxMenuItem.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
              if(checkBoxMenuItem.getState()){
                  try {
                      s = new Socket(InetAddress.getByName("172.17.21.144"), 9000);
                      in = new BufferedReader(new InputStreamReader(s.getInputStream()));
                      out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(s.getOutputStream())), true);
                  } catch (IOException e1) {
                      JOptionPane.showMessageDialog(c, "Greška pri konekciji!");
                        checkBoxMenuItem.setState(false);
                  }
              }
                else{
                  try {
                      s.close();
                      in.close();
                      out.close();
                  } catch (IOException e1) {
                      e1.printStackTrace();
                  }
              }
            }
        });
        meniProgram.add(checkBoxMenuItem);
        meniProgram.add("Izlaz").addActionListener(this);

        jMenuBar.add(meniProgram);
        setJMenuBar(jMenuBar);

        JRadioButton registracija = new JRadioButton("Registracija");
        registracija.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                komanda = "reg";
            }
        });
        // Selected by default
        registracija.setSelected(true);

        JRadioButton vreme = new JRadioButton("Vreme");
        vreme.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                komanda = "vreme";
            }
        });

        JRadioButton gadjaj = new JRadioButton("Gadjaj");
        gadjaj.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                komanda = "poz";
            }
        });

        ButtonGroup grupa = new ButtonGroup();
        grupa.add(registracija);
        grupa.add(vreme);
        grupa.add(gadjaj);

        c.setLayout(new GridLayout(8,1));
        c.add(registracija);
        c.add(vreme);
        c.add(gadjaj);

        JTextField pozicijaTextField = new JTextField();
        c.add(pozicijaTextField);

        JButton posalji = new JButton("Pošalji");
        posalji.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String zahtev = "";
                switch (komanda){
                    case "reg":
                        String username = JOptionPane.showInputDialog("Unesite svoje ime:");
                        zahtev = komanda + ":" + username;
                        break;
                    case "vreme":
                        zahtev = komanda + ":" + vreme;
                        break;
                    case "poz":
                        zahtev = komanda + ":" + pozicijaTextField.getText();
                        break;
                }
                if(checkBoxMenuItem.getState()){
                    out.println(zahtev);
                    try {
                        String odgovor = in.readLine();
                        JOptionPane.showMessageDialog(c, odgovor);
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
                else
                    JOptionPane.showMessageDialog(c, "Niste konektovani sa serverom!");
            }
        });

        c.add(posalji);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        switch (e.getActionCommand()){
            case "Snimi":
                JOptionPane.showMessageDialog(c, "Snimljene izmene!");
                break;

            case "Izlaz":
                System.exit(1);
                break;
        }
    }
}