JQplus Ques

[Mini Pilla]

Can somebody plz explain the output!!!
Thanx
import java.awt.*;
public class TestClass extends Frame
{
TestClass( )
{
setLayout(new FlowLayout());
CheckboxGroup[] cbgs = new CheckboxGroup[] { new CheckboxGroup(), new CheckboxGroup()};
for (int i=0; i<5; i++) add( new Checkbox("Checkbox"+i, true, cbgs[i%2] ) );
setSize(300, 300);
setVisible(true);
}
public static void main(String[ ] args)
{
new TestClass();
}
}

1.All check boxex
2.None of the check boxex
3.Throws runtime exception
4.check boxes labeled Checkbox0,Checkbox2
5.check boxes labeled Checkbox3,Checkbox4
Ans:
Only one checkbox can be selected in a checkboxgroup. As you go on adding checkboxes to a group in selected state, it unselects the previously added checkboxes.
Here, Checkbox 0,2,4 are added to cbg[0] and Checkbox 1 3 are added to cbg[1]. So Checkbox 4 and 3 remain selected.[/B]

[Mini Pilla]

helloo,
Nobody wants to attempt

[Paul Anilprem]

Well, what exactly do you not understand. As the explanation says only one one checkbox of a checkbox group can be selected. So out checkbox 0,2,4 4 will remain selected and out of 1 and 3, 3 will remain selected.
cbgs[i%2] : i%2 will only return 0 or 1 so each checkbox goes to either checkboxgroup 0 or 1.
-Paul.
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