?? ex11(5).java
字號:
// arrays/Ex11.java
// TIJ4 Chapter Arrays, Exercise 11, page 774
// Show that autoboxing doesn't work with arrays.
import static org.greggordon.tools.Print.*;
public class Ex11 {
public static void main(String[] args) {
int[] ia = new int[2];
ia[0] = new Integer(1); // will be autoboxed to int
ia[0] = new Integer(2); // autoboxing does work here
// an array of primitive int:
println(ia.getClass().getName());
Integer[] Ia = new Integer[2];
Ia[0] = (int)1; // will be autoboxed to Integer
Ia[1] = (int)2; // autoboxing works here
// an array of Integer:
println(Ia.getClass().getName());
println(Ia[0] instanceof Integer);
for(int i = 0; i < Ia.length; i++)
System.out.println(Ia[i].getClass().getName());
// Integer[] cannot be assigned to int[]:
// ia = Ia; // error: incompatible types
Ia[0] = (int)ia[0]; // more autoboxing
println(Ia[0].getClass().getName());
}
}
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