ItemListener().....need help? 1

[qb828]

hello!
can't find what is wrong wiht my code for eventhandling.
this is my check button event handling.
i am using swing. it won't compile.

here is my code. can yo take a look at it , please..

JRadioButton radiob1=new JRadioButton("Computer", true);
addComponent(radiob1,1,3,3,1);
JRadioButton radiob2=new JRadioButton("Player2", false);
addComponent(radiob2,5,3,3,1);
//create relationship of group
ButtonGroup radiogroup= new ButtonGroup();

radiogroup.add(radiob1);
radiob1.addItemListener(this);
radiogroup.add(radiob2);


i did this on top my class implements ItemListener

public void itemStateChanged(ItemEvent e)
{
if (e.getSource() == radiob1) <==error here
System.out.println(&quot;playing against computer&quot;
else
System.out.println(&quot;Playing against player2&quot;
}

thanks very much

Q

 

[CatWeasel]

As far as i can see the error that you get is the undefined variable on radiob1. This will be solved if you declare the buttons global in your code.

// global declaration of the buttons and other stuff
private JRadioButton radiob1;
private JRadioButton radiob2;
private ButtonGroup radiogroup;

//your function where you initiate everything
{
radiob1 =new JRadioButton(&quot;Computer&quot;, true);
addComponent(radiob1,1,3,3,1);
radiob2=new JRadioButton(&quot;Player2&quot;, false);
addComponent(radiob2,5,3,3,1);
//create relationship of group
radiogroup= new ButtonGroup();

radiogroup.add(radiob1);
radiob1.addItemListener(this);
radiogroup.add(radiob2);
}

public void itemStateChanged(ItemEvent e)
{
if (e.getSource() == radiob1) // error gone, now it knows radiob1
System.out.println(&quot;playing against computer&quot;
else
System.out.println(&quot;Playing against player2&quot;
}

Hope this helps.
Greetings,
Steven.

 

[qb828]

thanks steven..
i don't know why i didn't think about that!!
have Question about index array.
length gives integer of how many array there are.
i want to acess what a current array index is.

say int array[]=new int[3];
int c=array.length; //gives c=3, array size
array[2]; i want to acess index 2

can you do that?

Q