1.class SuperFo{ 2. SuperFo doStuff（int x）{ 3.return new SuperFo（） 4.} 5.} 6. 7.class Foo extends SuperFo{ 8.//insert code here 9.} 和四个声明： Foo doStuff（int x）{return new Foo（）；} Foo doStuff（int x）{return new SuperFoo（）；} SuperFoo doStuff（int x）{return new foo（）；} SuperFoo doStuff（int y）{return new SuperFoo（）；} 分别插入到第8行，有几个可以通过编译 （）A、1B、2C、3D、4E、5
1.class SuperFo{ 2. SuperFo doStuff（int x）{ 3.return new SuperFo（） 4.} 5.} 6. 7.class Foo extends SuperFo{ 8.//insert code here 9.} 和四个声明： Foo doStuff（int x）{return new Foo（）；} Foo doStuff（int x）{return new SuperFoo（）；} SuperFoo doStuff（int x）{return new foo（）；} SuperFoo doStuff（int y）{return new SuperFoo（）；} 分别插入到第8行，有几个可以通过编译 （）
- A、1
- B、2
- C、3
- D、4
- E、5
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