Access a variable

[Eric]

I have a MyApplet class. In it, I declare 1 instance variables is: x = 13
and I have a button. I want then I clicked this button, a frame showed.

My frame have 1 textfield and 1 button. I want then I clicked this button, value of variable x show in textfield.

I tried created a method as getx() in MyApplet class:

Code:

public double getx() {
   return x;
}

Then at MyFrame class, I tried to use x , but program show 1 error ( cannot find symbol x).
- None stop, I tried to declare a new object have type MyApplet
(MyApplet obj = new MyApplet) then use obj.getx() to take value of x variable. But result returned is 0.0

How do I must to take value of x variable from MyApplet class ?

Thanks
Eric

[Felissa]

We would need to see your whole code in order to tell you. My guess is that x isn't within the scope of your class where you want to return it.

Code:

public class test
{

  public test ()
  {
    int x = 1;
  }

  public int getX()
  {
    return x;  // WILL NOT WORK.  We can't see x here because it was declared in the method constructor.
  }
}

Code:

public class test
{
  private int x;
  public test ()
  {
    x = 1;
  }

  public int getX()
  {
    return x;  // WILL WORK.  x is now in the scope of the class and so methods within that class can use it.
  }
}

Greetings.
Felissa

[Eric]

That is demo program: (My program is MyApplet.java)

Code:

public class MyApplet extends Applet
{
    public double x1;
    
    public MyApplet() {
         x1 = 30;
    }

    public double getX() {
         return x1;
    }

   //(at here have a button which then clicked will show MyFrame)
   public void actionPerformed(ActionEvent ae)
   {
       if (ae.getSource().equals(btnShow)) {
            MyFrame oFrame = new MyFrame();
            oFrame.setVisible(true);
       }
   }
}

class MyFrame extends Frame
{
    public double x2;
    MyFrame()
    {
          x2 = x1 * 20;
          System.out.print("Value is : " + x2);
    }
}

I run program above, it have a error ... (cannot find symbol x1)
If I declared ( MyApplet obj = new MyApplet() ) then use obj.getX() to take value of x1, compile successfull but then I run it's show result x1 = 0.0. Why?

Thanks
Eric