Question

I have a program which requires the use of the same objects accross multiple different methods.. how do I make the scope of the class-type variable (object) so that it fits in all the methods in the primary class?

Answer 1

@ganeshie8

Answer 2

language: Java

Answer 3

I believe what I'm looking for is a 'singleton pattern' to do this.. I'll try that.

Answer 4

There are two ways to this and it depends on the context of what you are doing.

1. Static variables:
```
public MyClass {
private static Scanner input;

public static void main(String[] args) {
input = new Scanner(System.in);

method1();
}

public static void method1() {
if (input.nextLine().equals("1+1=3"))
System.out.println(method2());
}

private static boolean method2() {
return AnotherClass.variable1;
}
}

class AnotherClass {
public static boolean variable1 = false;
}
```
Input 1+1=3 in StdIn and the program will return false.

2. Instance varables:
```
public MyClass {
public static void main(String[] args) {
AnotherClass anCl = new AnotherClass();

anCl.evaluateInput();

anCl.count();
anCl.count();
anCl.count();
anCl.count();

System.out.println(anCl.count);

}
}

class AnotherClass {
private static Scanner input;
public int counter = 0;

AnotherClass() {
input = new Scanner(System.in);
++counter;
}

public void evaluateInput() {
if (input.nextLine().equals("1+1=3"))
System.out.println("false");
}

private void count() {
++counter;
}
}
```
Will print "false 5" if StdIn is "1+1=3" otherwise it'll just print "5".

All this might seem confusing at first but I strongly recommend you to read up on instance vs. static variables/metods/context, and also a bit on access modifiers. You'll need to understand this to properly implement what you are looking for.

In the meantime for a quick and dirt soulution you can just use the "private static" one in the static example.

Answer 5

*
```
System.out.println(anCl.counter);
```

Answer 6

Thank you a whole lot lyrae! This most certainly is a 'quick fix', I'm looking to finish my first text-based game, which I plan will be thoroughly entertaining :).

I look forward to learning about those keywords more in depth. cheers