问题:
class One {
public One foo() { return this; }
}
class Two extends One {
public One foo() { return this; }
}
class Three extends Two {
// insert method here
}
Which two methods, inserted individually, correctly complete the Three class?()
A . public void foo() { }
B . public int foo() { return 3; }
C . public Two foo() { return this; }
D . public One foo() { return this; }
E . public Object foo() { return this; }
class One {
public One foo() { return this; }
}
class Two extends One {
public One foo() { return this; }
}
class Three extends Two {
// insert method here
}
Which two methods, inserted individually, correctly complete the Three class?()
● 参考解析
本题暂无解析