Does Java have global variables?

Java program static menu method cant call non static variables?

• here is a sample of my source code my teacher wants us to have a a bunch of static/non static methods called and through a menu method but i keep getting the error that non static variables adn methods can not be referenced from a static content is there any way around this as well as non of my methods execute from the menu when i run the file it just shows the menu on the console does nothing when i enter a number any ideas public static void showMenu() { Scanner input=new Scanner(System.in); System.out.println("1: Forward \n" + "2: Bacward \n3: Forward G\n" + "4: Bacward G \n" + "5: Create File name \n" + "6: Create Random file name\n" + "7: Show Window\n" + "8: Exit \n" + "Select option:" ); do{ boolean quit = false; int SwitchValue =input.nextInt(); switch (SwitchValue) { case 1: { image_number = Forward(image_number); System.out.println(image_number); break; } case 2: { image_number = Backward(image_number); break; } case 3:{ Forward(image_number); break; } case 4:{ Backward(image_number); break; } case 5:{ CreateFilename(image_number); break; } case 6:{ CreateRandomName(); break; } case 7:{ showWindow(filename); break; } case 8: { getImage(); break; } case 9: { quit= true; break; } default: System.err.println ( "Unrecognized option" ); } }while(!true); } public static void main(String[] args) { Project3 object= new Project3(); Project3.showMenu(); } } and here is a sample of my methods public static int Forward(int current_number) { if( current_number >= MAX_NUMBER){ current_number = 1; } else { current_number ++; } return current_number; } public void Forward() { if (image_number >= MAX_NUMBER){ image_number = MIN_NUMBER; } else image_number ++; } public static int Backward(int current_number) { if (current_number <= MIN_NUMBER && current_number >= MAX_NUMBER){ current_number --; } else current_number = 1; return current_number; }

• Answer:

  so how are you building this? Are you using eclipse or Netbeans or some other ide or are you using cli and javac? Have you figured out how to get the information from the error console to help figure out where the error is occurring? Usually it is referenced with a line number so that should help you figure out where the problem is. I couldn't find a problem with your code compiling it. of course I had to comment out your undocumented functions such as CreateFilename(int). Maybe if you provide more information we can get to the root of the matter. Oh and if you haven't done so, do a clean and then rebuild if you're using an IDE.