Is there an order in which the Java codes need to be placed? viewed from top to botto

[Honijahu]

I am studying a tutorial and there was an excercise concerning Loops. I found out that if I placed my code like this it works:

package Userinput;
import java.util.Scanner;
public class Loops {

public static void main (String arg []){

int loopVal;
int end =11;
int answer=0;
int calculation=0;
Scanner read = new Scanner(System.in);
System.out.println("which table do you want?");
calculation = read.nextInt();

for(loopVal=1;loopVal<end;loopVal++){

answer = loopVal*calculation;
System.out.println(loopVal +" times "+calculation+" = "+answer);
}



}
}

But if I placed it like this it doesn't work:

package Userinput;
import java.util.Scanner;
public class Loops {

public static void main (String arg []){

int loopVal;
int end =11;
int answer=0;
int calculation=0
calculation = read.nextInt();
Scanner read = new Scanner(System.in);
System.out.println("which table do you want?");

for(loopVal=1;loopVal<end;loopVal++){
answer = loopVal*calculation;
System.out.println(loopVal +" times "+calculation+" = "+answer);
}



}
}

So I was wondering is there an order in which the Java codes need to be placed? e.g. first give datatypes (int, double etc) and then Scanner codes etc. etc.
Does anybody know?

thanks Honijahu

[JosAH]

Of course it doesn't work because you forgot a semi-colon in your second version (so it doesn't even compile).

kind regards,

Jos

[Ronin]

Hi Honijahu, welcome.

To answer your question, the order doesn't matter as long as the variable is declared before it is used and is in scope of where it it being used. By scope I'm refering to variables being declared in another method for example.

int calculation = read.nextInt();

The above is also a valid statement. I would not necessarily apply the same thinking to variables with loops as this would mean you are redeclaring the variable each time it is being called.

Regards.

[JosAH]

To answer your question, the order doesn't matter as long as the variable is declared before it is used and is in scope of where it it being used. By scope I'm refering to variables being declared in another method for example.

See the following counter example:

public class T {

	public static void main(String[] args) {
		
		System.out.println(x);
	}
	
	private static int x= 42;
}

kind regards,

Jos

[Ronin]

I see the confusion.
The position in this case is irelevant as the variable x is declared and initialized prior to its use. I should have added that although it looks like it is declared after its use just by looking at the code, is not how the JVM understands it.

For the OP I was looking at it from a beginners view.

System.out.println(x);
int x = 11

int x = 11;
System.out.println(x);

The first section of code is invalid whist the second works.

Regards.