kalk.jar

 kalkw.jar

 kalkm.jar

public class Kalk implements ActionListener
{
   JTextField t1;
   JButton b1;
   JButton bplus,brow;
   
   double x,buf;
   
   public void actionPerformed(ActionEvent e)                                       
   {                                                                                
      Object target = e.getSource();                                                
                                                                                    
      if(target==b1)                                                                
      {                                                                             
         t1.setText(t1.getText()+((JButton)target).getText());                      
         t1.requestFocus();                                                         
      }                                                                             
                                                                                    
      else if(target==bplus)                 //reakcja na nacisniecie przycisku '+' 
      {                                                                             
         buf=Double.parseDouble(t1.getText());                                      
         t1.setText("");                                                            
         t1.requestFocus();                                                         
      }                                                                             
                                                                                    
      else if(target==brow||target==t1)      //reakcja na nacisniecie przycisku '=' 
      {                                                                             
         x=Double.parseDouble(t1.getText());                                        
         x=buf+x;                                                                   
         t1.setText(Double.toString(x));                                            
         t1.requestFocus();                                                         
      }                                                                             
   }                                                                                
   
   void init()                                                                            
   {                                                                                      
      //try                                                                               
      //{                                      //wyglad (Look and Feel)                   
         //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());           
         //UIManager.setLookAndFeel("com.sun.java."+"swing.plaf.motif.MotifLookAndFeel"); 
      //}                                                                                 
      //catch(Exception e){}                                                              
                                                                                          
      JFrame f=new JFrame();                                                              
      Container c=f.getContentPane();                                                     
                                                                                          
      GridBagLayout gbl=new GridBagLayout();                                              
      GridBagConstraints gbc=new GridBagConstraints();                                    
      gbc.fill=GridBagConstraints.HORIZONTAL;                                             
      c.setLayout(gbl);                                                                   
                                                                                          
                                                                                          
                                                                                          
      t1=new JTextField(15);                                                              
      t1.addActionListener(this);                                                         
      t1.setHorizontalAlignment(JTextField.RIGHT);                                        
      gbc.gridx=0;                                                                        
      gbc.gridy=0;                                                                        
      gbc.gridwidth=5;                                                                    
      gbc.ipadx=0;                                                                        
      gbc.ipady=5;                                                                        
      gbc.insets=new Insets(5,5,0,5);                                                     
      gbl.setConstraints(t1,gbc);                                                         
      c.add(t1);                                                                          
                                                                                          
                                                                                          
                                                                                          
      b1=new JButton("1");                                                                
      b1.addActionListener(this);                                                         
      b1.setFocusable(false);                                                             
      gbc.gridx=0;                                                                        
      gbc.gridy=1;                                                                        
      gbc.gridwidth=1;                                                                    
      gbc.ipadx=0;                                                                        
      gbc.ipady=0;                                                                        
      gbc.insets=new Insets(5,5,0,0);                                                     
      gbl.setConstraints(b1,gbc);                                                         
      c.add(b1);                                                                          
                                                                                          
                                                                                          
                                                                                          
      bplus=new JButton("+");                                                             
      bplus.addActionListener(this);                                                      
      bplus.setFocusable(false);                                                          
      bplus.setToolTipText("dodawanie");   //tekst podpowiedzi ("dymek")                  
      gbc.gridx=3;                         //kolumna nr 3                                 
      gbc.gridy=1;                         //wiersz nr 1                                  
      gbc.gridwidth=2;                     //zajmuje dwie przyległe komorki               
      gbc.ipadx=30;                        //odstep wewn. w poziomie (internal padding)   
      gbc.ipady=0;                         //odstep wewnetrzny w pionie                   
      gbc.insets=new Insets(5,5,0,5);      //odstep wokol komponentu                      
      gbl.setConstraints(bplus,gbc);                                                      
      c.add(bplus);                                                                       
                                                                                             
                                                                                          
                                                                                          
      brow=new JButton("=");                                                              
      brow.addActionListener(this);                                                       
      brow.setFocusable(false);                                                           
      brow.setToolTipText("wykonaj działanie");                                           
      gbc.gridx=0;                                                                        
      gbc.gridy=5;                                                                        
      gbc.gridwidth=4;                                                                    
      gbc.ipadx=30;                                                                       
      gbc.ipady=0;                                                                        
      gbc.insets=new Insets(5,5,5,0);                                                     
      gbl.setConstraints(brow,gbc);                                                       
      c.add(brow);                                                                        
                                                                                          
                                                                                          
                                                                                          
      f.pack(); //dopasowuje rozmiar okna do jego zawartosci                              
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);                                   
      f.setTitle("Kalk");                                                                 
      f.setVisible(true);                                                                 
   }                                                                                      
   
   public static void main(String[] args)       
   {                                            
      //do wersji 1.4                           
      //new Kalk().init();                      
                                                
      //od wersji 1.5                           
      SwingUtilities.invokeLater(new Runnable() 
      {                                         
         public void run()                      
         {                                      
            new Kalk().init();                  
         }                                      
      });                                       
   }                                            
}