Setting a mnemonic on a tab allows the tab to be selected with a keystroke. For example, if the mnemonic for a tab were the key L, then typing ALT-L (on Windows) would select the tab.
// 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;
// Set the mnemonic; on some look and feels, the L in the label will be underlined
int keycode = KeyEvent.VK_L;
pane.setMnemonicAt(index, keycode);
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