Print the value of i outside the for loop in java

Question

I am trying to print/get the value of loop variable i and use it in another method outside the for loop. How do I do that?

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Answer 1

Variables declared in the for statement are in scope only in the for components and the following code block, see JLS section 14.14.1.1, in particular:

for ( ForInit ; Expression ; ForUpdate ) Statement

If the ForInit code is a local variable declaration, it is executed as if it were a local variable declaration statement (§14.4) appearing in a block.

If you want to have it available outside the for, you have to declare it in a scope that is active in the location you want to access it; e.g. just outside the for loop:

int i;
for (i = 0; i < 1000; ++ i)
    ;
// i is accessible in this scope
System.out.println(i);

Alternatively, if it is more appropriate, you could declare a separate variable and store the value of interest in it:

int k = ...;
for (int i = 0; i < 1000; ++ i)
    if (condition) // for example
        k = i;
// k is accessible in this scope, i is not
System.out.println(k);

For a brief summary see this page, specifically the Loop Scope example at the end, which has an example that is exactly like your question.

Answer 2

You can't, by definition the value of j is only available within this loop. But of course you could declare a variable outside this for loop and assign it to something within your loop. Exactly what value do you want it to be though? Since the value of your counter j at the end will always be the same.