How Do I Print Result Of A Void Method To A Jtextarea?

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1.00/5 (1 vote)

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Hello everyone, i was wondering how can i resovle my following issue:
i have a GUI JFrame named My_Frame, and it contains a jTextArea.
I have another Class named DBConnect witch has a method that prints stuff out of my Database.That method is called getData().
So, i want the output of getData() method to be the text of my TextArea.

jTextArea1.setText(db.getData()); Won't work!

Thanks for your time!

My code for the class : My_Frame

Java

public void jtextArea1(String text) {
    System.out.print(text);
        jTextArea1.append(text);     
    }
    
    public static void main(String args[]) {
        
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new My_Frame().setVisible(true);
                DBConnect db=new DBConnect();
                jTextArea1.setText(db.getData());
               
            }
        });

Posted 29-Dec-15 11:41am

Deathmitsos

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Comments

PIEBALDconsult 29-Dec-15 17:48pm

Change the result type maybe?

Deathmitsos 29-Dec-15 18:00pm

I managed to change the type to String, now i get the error: non-static variable jTextArea1 cannot be referenced from a static context.

Sergey Alexandrovich Kryukov 29-Dec-15 18:17pm

And what is that "static"? is it "main"? Then provide an instance...
—SA

Sergey Alexandrovich Kryukov 29-Dec-15 18:16pm

The "result of void method" is absurd. If you need "result", why using "void"?
—SA

Deathmitsos 29-Dec-15 18:21pm

I tried to remove static and convert getData(); method to String but still it couldn't work

Deathmitsos 29-Dec-15 18:25pm

Non Static method getData() cannot be referenced from a non-static context.

Sergey Alexandrovich Kryukov 29-Dec-15 18:54pm

Of course. You problem is that you are trying, using trial-and-error method, but you need to understand. You need to understand what is static and instance methods, what are referenced and referenced objects, and so on...
My_Frame is a type. Do you really understand what is type and what is instance?
Where your jTextArea comes from? There is no such thing. If this is a property of My_Frame, you don't have instance of My_Frame. You need to understand what you are doing.
—SA

Deathmitsos 29-Dec-15 19:01pm

I LOVE YOU SA! Error is gone,!

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