copydog.java

来自「java中的一些难题」· Java 代码 · 共 12 行

public class CopyDog {
    public static void main(String[] args) {
        Dog newDog = ??? ; // You figure out what to put here

        // This line should print false
        System.out.println(newDog == Dog.INSTANCE);

        // This line should print "Woof"
        System.out.println(newDog);
    }
}