Error <identifier expected> in java.

Question

I am not understanding why the code works if we write int x=10; but not works for int x; x=10;

https://code.sololearn.com/cvf3upOTq2Nc/?ref=app

Answer 1

harshit
it because all the data members in the

interface is by default
public
static
and imp (final)

as you know static data members take memory at class load time.
and
you cant change the value of variables if the variables is final.

now back to your question
there are two problem in your code.
first
1 int x; x=10
here two concept comes
initialization, assignment
so what happened
first default value provide by compiler to x
i.e x=0;
now
what you do
try to change so error come as you know now
why because of final variable.

2 test o=new test();
this is static binding..
if not
you got an error
does not find variable x
so do like this
display o=new test();

here your code

interface display
{
int x=10;
void show();
}
public class test implements display
{
public void show()
{
System.out.println(x);
}
public static void main(String[] args)
{
display o=new test();
o.show();
}
}

Answer 2

i believe it's because it's an interface and all values have to be set from the start

Answer 3

thanks