CODEWITHSUNDEEP
javawhile-loopinitializationfinal
Lionardo DiCaprio
Lionardo DiCaprio

Reputation: 13

Variable might be assigned in loop?

I don't know why the code is not compiling when final variable is initialized in loop and loop iterate only one time? Is Loop is somehow running more than one time and multiple assignments is done to variable x? 

public static void main(String args[]) {

    int y;
    final int x;
    y=1;
    while(y<=1) {
        x=10;       //Compile time error; even loop iterate only once.
        y++;
    }
}

Upvotes: 1

Views: 3425

Answers (4)

Nikolas
Nikolas

Reputation: 44408

Remove the keyword final. You cannot assign a value to the variable which is final over again and again. You can not initialize the final value in the for or while loop defined outside of the scope loop. Even the loop is called once, the compiler doesn not know in advance how many times the cycle would be called.

Upvotes: 3

xingbin
xingbin

Reputation: 28279

The compiler does not care how many times the code in the loop will be executed at run time. To prevent re-assignments that might happen, it is not allowed to assign final variables in a loop.

Upvotes: 1

Kristopher H Jung
Kristopher H Jung

Reputation: 11

when you have instance variable declared 

final int x;

x is assigned to 0. and final tag won't allow it to be changed.

while(y<=1) {
    x=10;       //Compile time error; even loop iterate only once.
y++;
}

inside while loop, you assign x to 10 which disobey the final rule.

Upvotes: 0

TaQuangTu
TaQuangTu

Reputation: 2343

In java, a final variable is a constant so you can not change its value. In your code above, x is final variable and I see that you are trying to change value of x. So you got compiler time error.

Upvotes: 1

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