?? finalarguments.java
字號(hào):
//: 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
g.spin();
}
void without(Gizmo g) {
g = new Gizmo();
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);
}
}
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