ActionListener Java摇摆

Question

i have being trying to create a window using swing ad i have to put the buttons on the right side that's why i used boxlayout but i can't find a way to use ActionListener on the button that i have. that's the program i am working on:

public class Fenetre2 extends JFrame {

private JSplitPane splitPan=null;

    public Fenetre2 (){
        JPanel pan = new JPanel ();

        // CARACTERISTIQUE FENETRE 
        this.setTitle("Gestion Employe");
        this.setSize(800, 400);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pan.setBackground(Color.white);
        this.setContentPane(pan);
        // ADD BUTTON  
        Container c = getContentPane();
        c.setLayout( new BorderLayout( 30, 30 ) );
        Box boxes[] = new Box[ 4 ];
        boxes[ 0 ] = Box.createHorizontalBox();
        boxes[ 1 ] = Box.createVerticalBox();
        boxes[ 2 ] = Box.createHorizontalBox();
        boxes[ 3 ] = Box.createVerticalBox();
        // create strut and add buttons to boxes[ 1 ]
        boxes[ 1 ].add( new JButton( "ajouter" ) );
        boxes[ 1 ].add( new JButton( "suprimer" ) );
        boxes[ 1 ].add( new JButton( "afficher" ) );
        c.add( boxes[ 1 ], BorderLayout.EAST );
        //TREE
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("STRUCTURE EMPLOYE");
        //create the child nodes
        DefaultMutableTreeNode PDGNode = new DefaultMutableTreeNode("PDG");
        DefaultMutableTreeNode departement1Node = new DefaultMutableTreeNode("departement 1");
        departement1Node.add(new DefaultMutableTreeNode("CHEF DEPARTEMENT"));
        departement1Node.add(new DefaultMutableTreeNode("EMPLOYEE1"));
        departement1Node.add(new DefaultMutableTreeNode("EMPLOYEE2"));
        departement1Node.add(new DefaultMutableTreeNode("EMPLOYEE3"));


        //add the child nodes to the root node
        root.add(PDGNode);
        PDGNode.add(departement1Node);
        JTree tree = new JTree(root);
        this.add(tree);
        JScrollPane scroll=new JScrollPane(tree);
        splitPan=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,scroll,new JLabel("aaaaa"));
        splitPan.setSize(this.getMaximumSize());
        add(splitPan);

        this.setVisible(true);          
    }
    public static void main (String args []){

        Fenetre2 fen = new Fenetre2();
    }
}

Answer 1

You should not add the buttons directly into the panel but instead instantiate them and then add an ActionListener to them or whatever else you want to do with them. Example:

JButton ajouterButton = new JButton("ajouter");
ajouterButton.addActionListener(new ActionListener() {
    @Override
    public void actionPerformed(ActionEvent event) {
        // code goes here
    }
});

Then you can add the button to your array:

boxes[1].add(ajouterButton);

Then do the same thing to all your buttons.

Answer 2

The button instance you are looking for is stored in boxes[1], so you can simply do boxes[1].addActionListener(...); .