but I don’t understand why “return x.a;” doesn’t signal an error return x.a is valid because x is accessible as a local variable inside the static method and is an instance of A. a is an instance property on the instance of A so x.a is perfectly valid. solved Why doesn’t “return x.a;” signal an … Read more
System.exit(int) takes an integer argument, but otherwise you can call it to terminate your program. Why do you want to call your main() method again? It is normally the static entry point to your program. If there’s some code you wish to repeat, I’d suggest putting this in its own method and calling that (from … Read more
You can of course write a method that creates JButton for you: public JButton createButton(String label, ActionListener listener, int x, int y) { JButton b = new JButton(label); name.addActionListener(listener); name.setBounds(x, y, 150, 50); return b; } and then use the method like this: button19 = createButton(“Toiletsager”, this, 100, 100); You can of course also specify … Read more
The program you wrote have some bugs. You are not assigning choice variable with the return value from readChoice() method. choice = readChoice(); instead of readChoice(); Also change checkChoice() method as follows to make sure it shows message for all invalid choices like 0 public static int checkChoice(int choice) { Scanner sc = new Scanner(System.in); … Read more
There’s a few things I can see you’re misunderstanding based on your attempt to do this. One is the attempt to access variables in locations where they are not in scope. sender and msg are two examples. Another is that you’re not returning msg from the Send method so it can be used in the … Read more
Can you do in C++ something like this: Yes. struct Lecture { }; struct Carriage { Carriage(const Lecture&) { } void runIt() { } }; int main() { Lecture le; Carriage ca = le; ca.runIt(); } The problem is, when I am trying to invoke a method which belongs to Lecture class the methods is … Read more
Is it possible to read a .py (python source code) as a file and display its class name, class methods and variables as output….? [closed] solved Is it possible to read a .py (python source code) as a file and display its class name, class methods and variables as output….? [closed]
It looks like you stopped following the pattern that you applied in the beginning. As you’ll see, prior to line 310, you have used play = scan.nextLine(); if (play.charAt(0) == ‘x’ ) Where you call the scanner to read a new line before checking the character. After line 310, you have stopped using the play … Read more
Use self: class MyClass: def __init__(self): self.name=”John” def other_method(self): print(self.name) other_method will print “John”. solved Can you access attributes that were created with the init method from other methods in the class? [closed]
int operation(int op, int n1, int n2) { switch( op ) { case 1: return subtraction(n1, n2); case 2: return multiplication(n1, n2); default: // default case, when the op value is neither 1 or 2 cout << “Error! << endl; return 0; } } @Edit: Added default case as suggested below. Also, I think that … Read more
You’d better simplify all of this, you don’t need to call your method multiple times : public static void main(String[] args) { Scanner scanner = new Scanner(System.in); while (writeAndCheckEven(Integer.parseInt(scanner.nextLine()))) { System.out.println(“You added an even number, go on”); } System.out.println(“You added an odd number, done!”); } private static boolean writeAndCheckEven(int number) { return number % 2 … Read more
I checked your codes and found some problems: num_array.reverse.each_with_index { |value , index| if index % 3 == 0 && num_array[index] != 0 num_string = num_string << ones_place[value-1] elsif index % 3 == 0 && value > 0 && num_array[index] != 0 num_string = num_string << other_place[index/3] << ones_place[value-1] elsif index % 3 == 1 … Read more
I agree that it’s tricky. What teases in methodThree is that t is changed in the course of the call to methodTwo. So when you are looking at t.sum before and after that call, you are not looking at the same t. How is t changed? This happens when methodTwo calls methodOne, which in turn … Read more
In rare cases the thing that you want could be reasonably, but normally the class is not aware of all it’s elements. A total Score is for a Collection of Score elements, maybe a List or a Set. So you would do: class Score { int value; // … public static int totalScore(Collection<Score> scores){ int … Read more
I think this will do it. Also, Object[][] isn’t right. private String[][] singleplay = {{“#”,”Name”,”Score”},{“1″,”———-“,”10”},{“2″,”———-“,”20”}}; /** * Returns the score. * * @param id * The index of the entry in the array table. * * @throws ArrayIndexOutOfBoundsException * When the destination relative position is out of bounds. * * @return The score, 0 if … Read more