KursaDarbs

import javax.swing.JFrame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Toolkit;
import javax.swing.GroupLayout;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import java.awt.Dimension;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.border.EtchedBorder;
import javax.swing.border.TitledBorder;
import javax.swing.text.JTextComponent;
import javax.swing.JOptionPane;

class NumOnly extends KeyAdapter {

    private String Atlauts = "[^0-9]";  //Atļautās pogas.
    public void keyReleased(KeyEvent e) {   //Key event. Kas notiek, kad nospiesta poga
        String curText = ((JTextComponent) e.getSource()).getText();  //Pašlaicīgais teksts
        curText = curText.replaceAll(Atlauts, "");   //Nav atļauta poga? aizvieto to ar tukšumu.

        ((JTextComponent) e.getSource()).setText(curText);
    }
}

public class kursadarbs{

    static boolean Pirmsk (int x)
        {
          if(x <= 1)
            return false;
          int s = (int) Math.sqrt(x);
          for(int i = 2; i <= s; i++)
            if(x%i == 0)
              return false;
          return true;
        }

    public static void main(String[] args) {

        JFrame frame= new JFrame();
        JPanel panel= new JPanel();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //iziet piespiežot x augšā.

        JLabel label1= new JLabel("Ievadiet skaitļu 1 robežu: ");

        final JTextField textbox1= new JTextField(10);
        textbox1.addKeyListener(new NumOnly());

        JLabel label2= new JLabel("Ievadiet skaitļu 2 robežu: ");

        final JTextField textbox2= new JTextField(10);
        textbox2.addKeyListener(new NumOnly());

        JButton button= new JButton("Aprēķināt");

        final JTextArea textarea= new JTextArea(20,20); //Rezultāts
        textarea.setEditable(false);
        textarea.setLineWrap(true);
        JScrollPane scroll= new JScrollPane(textarea);
        scroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        textarea.setWrapStyleWord(true);
        textarea.setBorder(new TitledBorder(new EtchedBorder(), "Rezultāts"));




        GroupLayout groupLayout = new GroupLayout(panel);
        panel.setLayout(groupLayout);
        groupLayout.setAutoCreateGaps(true);      // Izmanto automātisku atstarpju veidošanu
        groupLayout.setAutoCreateContainerGaps(true);

        GroupLayout.SequentialGroup HorSGroup= groupLayout.createSequentialGroup(); //Izveido sakārtotu grupu. Šī grupa atbild par horizontālajiem priekšmetiem
        GroupLayout.SequentialGroup VerSGroup= groupLayout.createSequentialGroup(); //... Bet šī par Vertikālajām grupām

        GroupLayout.ParallelGroup HParallelGroup1= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING); //Izveido Horizontālās grupas.
        GroupLayout.ParallelGroup HParallelGroup2= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING);
        GroupLayout.ParallelGroup HParallelGroup3= groupLayout.createParallelGroup(GroupLayout.Alignment.LEADING);

        HParallelGroup1.addComponent(label1); //Pievieno objektus dotajai grupai
        HParallelGroup1.addComponent(label2);
        HParallelGroup2.addComponent(textbox1);
        HParallelGroup2.addComponent(textbox2);
        HParallelGroup2.addComponent(scroll);
        HParallelGroup3.addComponent(button);

        HorSGroup.addGroup(HParallelGroup1); //Horizontālās grupas tiek pievienotas sakārtotajai grupai
        HorSGroup.addGroup(HParallelGroup2);
        HorSGroup.addGroup(HParallelGroup3);

        GroupLayout.ParallelGroup VerPGroup1= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE); //Izveido Vertikālās grupas.
        GroupLayout.ParallelGroup VerPGroup2= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);
        GroupLayout.ParallelGroup VerPGroup3= groupLayout.createParallelGroup(GroupLayout.Alignment.BASELINE);

        VerPGroup1.addComponent(label1); //Pievieno objektus
        VerPGroup1.addComponent(textbox1);
        VerPGroup1.addComponent(button);
        VerPGroup2.addComponent(label2);
        VerPGroup2.addComponent(textbox2);
        VerPGroup3.addComponent(scroll);

        VerSGroup.addGroup(VerPGroup1); //Vertikālās grupas pievieno Vertikālajai Sakārtotajai grupai
        VerSGroup.addGroup(VerPGroup2);
        VerSGroup.addGroup(VerPGroup3);

        groupLayout.setHorizontalGroup(HorSGroup); //Pasaka, kura grupa ir galvenā horizontālā virzienā
        groupLayout.setVerticalGroup(VerSGroup);




        Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
        int x = (int) (dimension.getWidth()/4);
        int y = (int) (dimension.getHeight()/4);
        frame.setLocation(x, y); //Ieliek programmu gandrīz monitora vidū.

        button.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e)
            {
               //Šis viss notiek, kad ir nospiesta poga Aprēķināt.
                String first = null, second = null, name="Pirmskaitļu aprēķinātājs";
                int first1=0, second1=0, count=0;
                textarea.setText("");
               first= textbox1.getText();  //Iegūst no textbox1 skaitļus
               second= textbox2.getText();

               if(!first.isEmpty() && !second.isEmpty()) //Ja ne textbox1 un textbox2 nav tukšs, notiek šis kods.
               {
                   first1= Integer.parseInt(first);  //Pārveido string par Integer.
                   second1= Integer.parseInt(second);

                   if(first1<second1)
                   { //Pārbauda, vai otrais ievadītais skaitlis nav lielāks par pirmo.
                      for(int i=first1;i<=second1;i++)
                       {
                          if(Pirmsk(i))
                          {
                            textarea.append(i+"\n");
                            count++;
                          }
                       }

                     if(count!=0)
                     {
                     JOptionPane.showMessageDialog(null, "Kopā atrasti "+count+" pirmskaitļi", name, JOptionPane.INFORMATION_MESSAGE); //Ja ir atrasts kāds pirmskaitlis, izvada šo.
                     }
                     else //Ja nav, tad pasaka ka nav atrasti pirmskaitļi
                     {
                       JOptionPane.showMessageDialog(null, "Nav atrasts neviens pirmskaitlis", name, JOptionPane.INFORMATION_MESSAGE);
                     }
                   }// Ja ir pareizi
                   else
                   {
                       JOptionPane.showMessageDialog(null,"Ievadīti nepareizi dati! Lūdzu, pārvadiet datus.", name, JOptionPane.ERROR_MESSAGE );
                   }
               } else
               {
                   JOptionPane.showMessageDialog(null,"Ievadīti nepareizi dati! Lūdzu, pārvadiet datus.", name, JOptionPane.ERROR_MESSAGE  );
               }


            }
        });


        frame.add(panel); //Pievieno paneli
        frame.setSize(500, 500); //Programmas lielums pikseļos.
        frame.setResizable(false); //Rāmi nevar palielināt, vai samazināt.
        frame.setTitle("Kursa darbs. Austris Baumanis");//virsraksts
        frame.setVisible(true); //parāda ka ir redzams


    }

}