In what way is static declaration different from dynamic declaration?

In static declaration, the initial value of the variable is provided as a literal at the time of declaration. For example:

int mathScore = 100;
double p = 1.4142135;
char ch = 'A';

In dynamic declaration, the initial value of the variable is the result of an expression or the return value of a method call. Dynamic declaration happens at runtime. For example:

int a = 4;
int b = Math.sqrt(a);

double x = 3.14159, y = 1.4142135;
double z = x + y;