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I am attempting my first go at JFrames in Java, and whenever I run my program an empty window shows up. I have added my buttons, my panel, yet it is completely blank. Is there anything specific about JFrame that I should know that could cause this mistake? The final product has no buttons at all. I have checked to see that every method has been called.

As a clarification, I am not asking for code revisions, as my code is too long and I don't know how to simplify it, nor do I know enough about the problem to do so, in order to provide an example. The reason I am posting is to ask about the nature of JFrame and under what conditions it would be an empty screen like this. I also looked at the post for how to simplify code, and it doesn't seem to apply(correct me if I'm wrong) because my problem is a lack of turnout, so removing code bit-by-bit will not result in the error disappearing.

Full Code :

I've created a simple Tic-Tac-Toe game using python3. The gameplay itself works exactly as it should, the only problem I'm having is that the reset function is not properly wiping the board. It sets the value, prints it out, and yet on the next operation uses the old value.

This crux of the matter is that when you select, yes, you would like to play again, the game instantly ends due to it using the finalized board from the previous game. I've tried a couple different things, but end up with the same result. Is it a problem with scope an obvious mistake in the code. The problem should be contained in the reset() function, everything else is there for context.

I am new to angular and i am working on angular 4 app and trying to navigate from module component to layout component when button clicked. but navigate not working.

and i don't see any error message.

i spent lot of time on google to resolve this issue but i am unable to resolve.

below is the code.

html:

I have a table containing a list of products. Below the table I have a text field where a barcode is entered, if the barcode is found the matching row in the table should be highlighted. i've read through many similar scenarios and as far as I can tell i'm doing everything as I should. I can see in the google dev console that the barcode I enter matches the only product currently in my table however for some reason the css doesn't get applied... Any idea what i'm doing wrong here?/how I can go about fixing it?

my css: