Unreachable code ; i dont understand why it is unreachable

First, analyse your code,
Have a look at block

case 3: {
        System.out
                .println("You head towards Moat Caillin. the journey is swift and you are greeted by the Lord of Moat Caillin");
        System.out
                .println("The Lord of Moat Caillin offers your his company for dinner. type in your desired option");
        System.out.println("1: accept the lords offer.");
        System.out.println("2: kindly decline the lords offer.");
        System.out.println("3: kill the lord and take his possessions.");
        byte input4 = Byte.parseByte(reader.nextLine());

        switch (input4) {
        case 1:
            System.out
                    .println("the lord insults you at dinner. you lose your temper and walk out. the lord has you killed. Game over.");
            break;
        case 2:
            System.out
                    .println("the lord accepts your decline. he offers you gold to reconsider, as he has a proposition for you.");
            break;
        case 3:
            System.out
                    .println("you kill the lord, and take Moat Caillin. you marry the daughter of a highborn.");
            break;
        default:
            System.out.println("invalid input");
        }

        break;
    Default:
        System.out.println("Invalid Input");
        break;
    }

Let’s analyse this block, what you have, is bunch of print statements, then switch block, and break after that. break cause tou to exit from this case statement, hence code after Default label is unreachable

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