Java

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Anyone here know much about java? Doing a project for uni where im creating a chat client and server and ive run into a problem where after the user enters their password and username and click ok it throws an exception. The problem is when i use

ChatClient01 chat = new ChatClient01(); chat.setVisable(true);

it tells me to add a method in the chatclient class which i do like this

void setVisable(boolean b) {
show(b);
}


but im getting a red line under show(b) even though im using this approach in a diffrenet class and its working fine. Any help would be appreciated.