What is a best practice for objects created and literals

If I have to run a method several times, is it better to do this:
int i = 0;
public void test(){
     i = rand.nextInt();
     System.out.println(i);
} 
Or is it better to do:
public void test(){
     int i = 0;
     i = rand.nextInt()
     System.out.println(i);
}
Assuming that the variable 'i' will NOT again the program, considering that I have will take place probably this method a hundred times or more, I just want to know which is faster or better.

And if it was an object rather than a literal? -What changes it?

What happens if the method is static? -What changes it?
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It is best to declare variables in the lowest scope possible. So, given the choice between these two pieces of code and other assumptions you mention, the second part of the code is better.

(By the way the rule is true because it makes your code easier to understand. In the second part of the code you posted, it is obvious that variable 'i' isn't used everywhere except in the "test" method In the first part of the code, the reader cannot tell. Less the player should reflect the code you write, the better code.)

However if the second part of the code is what you want, then it is too long. Why you initialize the variable to zero, and then in the next line assign another value to it? Why not simply initialize this another value in the first place?

It's a line too.

Then, if you are going to assign a value to a variable and then print the value of this variable, why not just print the value directly? Why have the variable at all?

This is so two lines too.

It is usually best to write less code, and no more code. Most code you write more code must contain errors. Beginners used to write a lot too much code. However, it is possible to go overboard with the idea of writing less code; It is possible to write a long and unreadable 'one-liners', which do the work, but when some other poor decoration needs to change to something else, it's impossible.

You will notice that I have not address the issue of the "faster" at all. This is because that things like when you declare variables are a triviality in terms of speed things run.

Tags: Java

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