Setting the Number of Visible Items in the Menu of a JComboBox Component
By default, the menu of a combobox only shows eight items. If there
are more items in the menu, a scrollbar is automatically created. To
change the default of eight, use JComboBox.setMaximumRowCount().
// Create a read-only combobox with lots of items
String[] items = new String[50];
for (int i=0; i<items.length; i++) {
items[i] = "" + Math.random();
}
JComboBox cb = new JComboBox(items);
// Retrieve the current max visible rows
int maxVisibleRows = cb.getMaximumRowCount();
// Change the current max visible rows
maxVisibleRows = 20;
cb.setMaximumRowCount(maxVisibleRows);
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