Here is my banana joke program. I tried so many times but I got either "code took to long" or "oh no, cannot run".

Hey Xin Wang it seems like you are close, but I think it'd be best if you started the challenge with a clean slate again and re-read the instructions.

Lets start by looking at the code and instructions given to us and we'll work through it together.

Instructions:

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Now let's have our code make a joke. Read the code and comments below.

We want to move that prompting code into a do while loop. Wrap the code into a do while code block and check in the while condition to see if who is "banana" so that the loop continues.

HINT: Remember to move your who declaration outside of the do block so that it can be accessed.

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Code:

/*  So the age old knock knock joke goes like this:

    Person A:  Knock Knock.
    Person B:  Who's there?
    Person A:  Banana
    Person B:  Banana who?
    ...as long as Person A has answered Banana the above repeats endlessly
    ...assuming the person answers Orange we'd see
    Person B:  Orange who?
    ...and then the punchline.
    Person A:  Orange you glad I didn't say Banana again?
    (It's a really bad joke that makes it sound like "Aren't you glad I didn't say Banana again?")

    Let's just assume the only two words passed in from the console from Person B are either banana or orange.
*/

// ====BEGIN PROMPTING CODE====

// Person A asks:
console.printf("Knock Knock.\n");

// Person B asks and Person A's response is stored in the String who:
String who = console.readLine("Who's there?  ");

// Person B responds:
console.printf("%s who?\n", who);

// ==== END PROMPTING CODE ====

Let's try to figure out our first step from the instructions

Instructions:

-------------------------------------------------------------

Now let's have our code make a joke. Read the code and comments below.

We want to move that prompting code into a do while loop. Wrap the code into a do while code block and check in the while condition to see if who is "banana" so that the loop continues.

HINT: Remember to move your who declaration outside of the do block so that it can be accessed.

-------------------------------------------------------------

Looks like we want to move "prompting code" into a do while loop.

Your first step will be to surround this:

// ====BEGIN PROMPTING CODE====

// Person A asks:
console.printf("Knock Knock.\n");

// Person B asks and Person A's response is stored in the String who:
String who = console.readLine("Who's there?  ");

// Person B responds:
console.printf("%s who?\n", who);

// ==== END PROMPTING CODE ====

in a do while loop.

Now let's figure out whats next.

Instructions:

-------------------------------------------------------------

Now let's have our code make a joke. Read the code and comments below.

We want to move that prompting code into a do while loop. Wrap the code into a do while code block and check in the while condition to see if who is "banana" so that the loop continues.

HINT: Remember to move your who declaration outside of the do block so that it can be accessed.

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We know that we must compare the String value of the who variable and see if it equals "banana".

...
}while(who.equalsIgnoreCase("banana"));

This looks good. Let's try to submit!

Bummer! We get an error! We forgot to read the "note" at the bottom of the instructions!

Instructions:

-------------------------------------------------------------

Now let's have our code make a joke. Read the code and comments below.

We want to move that prompting code into a do while loop. Wrap the code into a do while code block and check in the while condition to see if who is "banana" so that the loop continues.

HINT: Remember to move your who declaration outside of the do block so that it can be accessed.

-------------------------------------------------------------

You already did this in the code posted in your question. Perfect!

Following those steps above, you should be able to successfully complete the first challenge. If you ever get another issue like this, stop and try the problem again, and re-read the instructions carefully. If you need any more help, then leave a comment. Keep coding!