CODEWITHSUNDEEP
javaswingdynamicjbutton
Reshad
Reshad

Reputation: 2652

Creating JButtons dynamically

Hello I have this set up

private JButton btnFoo, btnBar;

And I need to get for each button the following

        btnFoo = new JButton("Foo");
    btnFoo.addActionListener(this);
    add(btnFoo);

Is it possible in Java to create this dynamically for each button I declare? because when I have like 5 buttons I don't want 3x5 = 15 lines of code but only a few lines with dynamically created buttons.

Upvotes: 1

Views: 9860

Answers (3)

Ivan Velasco
Ivan Velasco

Reputation: 21

        boton1= new JButton();
        boton1.setText(" Calcular ");
        add(boton1);
        boton1.setActionCommand("Calcular");
        boton1.addActionListener(this);
        boton1.setEnabled(true);

        String nB2="boton";


        for(int j=2; j<4; j++){
            JButton botonGenerico = new JButton(nB2+j);
            botonGenerico.setText("Calcular"+j);
            add(botonGenerico);
            botonGenerico.setActionCommand("Calcular"+j);
            botonGenerico.addActionListener(this);
            botonGenerico.setEnabled(true);


        }

public void actionPerformed(ActionEvent e){
    String a = e.getActionCommand();

    if(a.equals("Calcular")){
        JOptionPane.showMessageDialog(null, "¡boton 1");

        }
    if(a.equals("Calcular2")){
        JOptionPane.showMessageDialog(null, "¡boton 2");

        }
    if(a.equals("Calcular3")){
        JOptionPane.showMessageDialog(null, "¡boton 3");

        }

}

Upvotes: 2

Martijn Courteaux
Martijn Courteaux

Reputation: 68847

Write a little loop and store your buttons in an array:

private JButton buttons[] = new JButton[5];

String names[] = {"Foo", "Bar", "Baz", "Fob", "Bao"};
for (int i = 0; i < buttons.length; ++i)
{
    JButton btn = new JButton(names[i]);
    btn.addActionListener(this);
    add(btn);
    buttons[i] = btn;
}

Upvotes: 6

Juvanis
Juvanis

Reputation: 25950

That's where arrays and loops come to help. Use a button array and iterate over it. But if you worry about identifiers, then using HashMap<String, JButton> might be a good way.

Map<String, JButton> buttons = new HashMap<String, JButton>();
map.put("fooButton", new JButton());
...

By iterating over the entry set (just a few lines of code), set the ActionListener for the buttons.

Upvotes: 2

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