import javax.swing.*;
import javax.swing.text.MaskFormatter;
import java.awt.event.*;
import java.text.ParseException;

public class Test extends JFrame{
    MaskFormatter f1;
    JFormattedTextField t1, t2;
    String str1,str2;
    String strR1 = "",strR2 = "";
    Reader r = new Reader();
    Timer time1 = new Timer(100, new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            str1 = t1.getText();
        }
    });
    Timer time2 = new Timer(100, new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            str2 = t2.getText();
        }
    });
    public Diskriminant(String s){
        super(s);
        try {
            f1 = new MaskFormatter("*#####");
            f1.setValidCharacters("-1234567890");
            t1 = new JFormattedTextField(f1);
            t1.setColumns(5); t1.addFocusListener(new CustomListener1());
            t2 = new JFormattedTextField(f1);
            t2.setColumns(5); t2.addFocusListener(new CustomListener2());
        } catch (ParseException e) {}
        add(t1);add(t2);
    }
    public class Reader implements ActionListener{
        public void actionPerformed(ActionEvent e) {
            try{
                //События...
            }catch(Exception ex){};
        }
    }
    public class CustomListener1 implements FocusListener {
        public void focusGained(FocusEvent e) {
            time1.start();
        }
        public void focusLost(FocusEvent e) {
            time1.stop();
            strR1 = "";
            char[] chstr1 = new char[str1.length()];
            str1.getChars(0, str1.length(), chstr1, 0);
            for (int i = 0; i < str1.length(); i++)
                if (chstr1[i] != ' ')
                    strR1+=chstr1[i];
            t1.setValue(strR1);
        }
    }
    public class CustomListener2 implements FocusListener {
        public void focusGained(FocusEvent e) {
            time2.start();
        }
        public void focusLost(FocusEvent e) {
            time2.stop();
            strR2 = "";
            char[] chstr2 = new char[str2.length()];
            str2.getChars(0, str2.length(), chstr2, 0);
            for (int i = 0; i < str2.length(); i++)
                if (chstr2[i] != ' ')
                    strR2+=chstr2[i];
            t2.setValue(strR2);
        }
    }
}