problem in inheritence in java

I have a Frame class that I put one Jtree on it, now I developed a TreeSelectionListener for my tree. since my tree is in my Frame class how I can access to my tree ?

I want to know witch node pressed by user. I create a stataic class from my frame class but I think this way is wrong please advice me.

public Frame1(){
    JTree jtree = new Jtree();
    public static Frame1 THIS;
     public Frame(){
     init();
     THIS = this;
     }
     public static getTHIS(){
         return THIS;
     }
}

public class jtreeSelectionListener implements TreeSelectionListener{

//here I need to access my jtree object, what should I do in this case?
// now I do like this 开发者_运维问答. Frame1.getTHIS.jtree ...
}

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Just create a constructor for JTreeSelectionListener that takes your JTree:

public class Frame1 extends JFrame {
    private JTree jtree = new JTree();

    public Frame1() {
        jtree.addTreeSelectionListener(new JTreeSelectionListener(jtree));
    }
}

public class JTreeSelectionListener implements TreeSelectionListener {
    private JTree jtree;

    public JTreeSelectionListener(JTree jtree) {
        this.jtree = jtree;
    }

    public void valueChanged(TreeSelectionEvent e) {
    }
}

---

Another approach is to combine the listener functionality with your frame class:

public class Frame1 extends JFrame implements JTreeSelectionListener {
    private JTree jtree = new JTree();

    public Frame1() {
        jtree.addTreeSelectionListener(this);
    }

    public void valueChanged(TreeSelectionEvent e) {
        // can now access jtree directly ...
    }
}