26 lines
603 B
Java
26 lines
603 B
Java
// reuse/FinalArguments.java
|
|
// Using "final" with method arguments.
|
|
|
|
class Gizmo {
|
|
public void spin() {}
|
|
}
|
|
|
|
public class FinalArguments {
|
|
void with(final Gizmo g) {
|
|
//! g = new Gizmo(); // Illegal -- g is final
|
|
}
|
|
void without(Gizmo g) {
|
|
g = new Gizmo(); // OK -- g not final
|
|
g.spin();
|
|
}
|
|
// void f(final int i) { i++; } // Can't change
|
|
// You can only read from a final primitive:
|
|
int g(final int i) { return i + 1; }
|
|
public static void main(String[] args) {
|
|
FinalArguments bf = new FinalArguments();
|
|
bf.without(null);
|
|
bf.with(null);
|
|
}
|
|
}
|
|
/* Output: (None) */
|