By default, all new tabs are enabled, which means the user can select them. A tab can be disabled to prevent the user from selecting it.
// Create a tabbed pane
JTabbedPane pane = new JTabbedPane();
// Add a tab
pane.addTab("Tab Label", component);
// Get index of the new tab
int index = pane.getTabCount()-1;
// Determine whether the tab is enabled
boolean enabled = pane.isEnabledAt(index);
// Disable the tab
pane.setEnabledAt(index, false);
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