codeql/java/ql/src/Advisory/Statements/MissingDefaultInSwitchGood.java

int menuChoice;

// ...

switch (menuChoice) {
    case 1:
        System.out.println("You chose number 1.");
        break;
    case 2:
        System.out.println("You chose number 2.");
        break;
    case 3:
        System.out.println("You chose number 3.");
        break;
    default:  // GOOD: 'default' case for invalid choices
        System.out.println("Sorry, you made an invalid choice.");
        break;
}