RadioButto
jLabel1.setText("tekst");
    if(jRadioButton1.isSelected())
        jRadioButton2.setSelected(false);

CheckBox
jLabel2.setText("tekst2");
    if(jCheckBox1.isSelected())
        jCheckBox2.setSelected(false);

List
String wybor1 = "Item1";
    if(wybor1.equals("Item1"))
        jLabel3.setText("generowany tekst");

DialogWindow
String dialog = JOptionPane.showInputDialog("podaj tekst");
JOptionPane.showMessageDialog(rootPane, "Wybierz Plik");

PopupMenu
jPopupMenu1.show(this, 200, 400);

String to Int - 1v.
String tekst = jTextField1.getText();
Integer number = Integer.valueOf(tekst);
jLabel1.setText("" + number);

String to Int - 2v.
String liczba = "1234";
Integer number = Integer.valueOf(liczba);
jLabel7.setText("" + number);

Int to String
Integer number = 1234;
String liczba = Integer.toString(number);
jLabel1.setText(liczba);

ImageIcon
public class MainOkno extends javax.swing.JFrame
	ImageIcon image = new ImageIcon("C:\\Users\\lokalizacja pliku");

	jLabel4.setIcon(image);