Question

As I understand, in case of an array, JAVA checks the index against the size of the Array.
So instead of using array[i] multiple times in a loop, it is better to declare a variable which stores the value of array[i], and use that variable multiple times.

My question is, if I have a class like this:

public class MyClass(){

    public MyClass(int value){
      this.value = value;
    }

    int value;
}

If I create an instance of this class somewhere else: (MyClass myobject = new MyClass(7)), and I have to use the objects value multiple times, is it okay to use myobject.value often or would it be better to declare a variable which stores that value and use that multiple times, or would it be the same?

Answer 1

In your case, it wouldn’t make any difference, since referencing myobject.value is as fast and effective as referencing a new int variable.

Also, the JVM is usually able to optimize these kinds of things, and you shouldn’t spend time worrying about it unless you have a highly performance critical piece of code. Just concentrate on writing clear, readable code.