What is the role of array capacity in java? In the below code i set array capacity to 2 there are 4 array is defined & no error.

Question

public class Program {
public static void main(String[] args) {
{String [] myNames =new String [2];
}
String[ ] myNames = { "A", "B", "C", "D"};
System.out.println(myNames[3]);
}
}

Answer 1

When you added the curly braces { } around the first myNames variable you created a new inline code block defining its scope within that block only. It is allocated to memory. Never initialized or assigned. Then immediately deallocated from memory and made available for garbage collection. Thus could never be used.

You then defined a new variable outside that block with the same name. If you were to remove the curly braces you'd get an error and your code wouldn't compile. Likewise, if you moved the curly braces around the second declaration of the variable myNames, you'd end up getting an array out of bounds error as you'd be attempting to access an element beyond the end of the array.

Answer 2

cause the first is a local variable only available inside the main function the other one isnt and with that println u r calling the second one so will print D