Question

How do I get the quantity of all selected JToggleButtons in a ButtonGroup?

ButtonGroup bGroup = new ButtonGroup();
bGreen = new JToggleButton("Green");
bYellow = new JToggleButton("Yellow");
bRed = new JToggleButton("Red");

bGroup.add(bGreen);
bGroup.add(bYellow);
bGroup.add(bRed);

Answer 1

There are several ways. For example bGroup.getSelection().getSelectedObjects().length.
You can also call getElements(), then iterate over enumeration and ask isSelected() for each button.
Please refer to API doc.