public class Test {
public static void main(String[] args){
Object fruit=new Fruit();
Object apple=(Apple)fruit;
}
}
class Apple extends Fruit{
}
class Fruit{
}
要怎么修改它??
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public class Test { public static void main(String[] args){ Object fruit=new Fruit(); Object apple=(Apple)fruit; } } class Apple extends Fruit{ } class Fruit{ } 要怎么修改它??