final class Complex {
private double re, im;
public Complex(double re, double im) {
this.re = re;
this.im = im;
}
Complex(Complex c)
{
System.out.println("Copy constructor called");
re = c.re;
im = c.im;
}
public String toString() {
return "(" + re + " + " + im + "i)";
}
}
class Main {
public static void main(String[] args) {
Complex c1 = new Complex(10, 15);
Complex c2 = new Complex(c1);
Complex c3 = c1;
System.out.println(c2);
}
}
(一种)
Copy constructor called
(10.0 + 15.0i)
(B)
Copy constructor called
(0.0 + 0.0i)
(C)
(10.0 + 15.0i)
(D)
(0.0 + 0.0i)
答案: (A)
解释:
这个问题的测验