题目内容

SCJP：In which two cases does the compiler supply a default constructor for class A? (Choose two.)

A. class A {}
B. class A { public A() { } }
C. class A { public A(int x) { } }
D. class A{ void A(){ } }

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SCJP： Which two allow the class Thing to be instantiated using new Thing()? (Choose two.)

A. public class Thing { }
B. class Thing { public Thing(){ } }
C. public class Thing{ public Thing(void){ } }
D. public class Thing{ public Thing(String s){ } }
E. public class Thing{ public void Thing(){ } public Thing(String s){ } }

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SCJP：In which two cases does the compiler supply a default constructor for class A? (Choose two.)

A. class A {} B. class A { public A() { } } C. class A { public A(int x) { } } D. class A{ void A(){ } }

SCJP： Which two allow the class Thing to be instantiated using new Thing()? (Choose two.)

用 修饰的类叫抽象类。抽象类只能被继承，不能被实例化。用 修饰的类叫最终类，只能被实例化，不能被继承。

定义包要使用语句。

引入包要使用语句。

A. class A {}
B. class A { public A() { } }
C. class A { public A(int x) { } }
D. class A{ void A(){ } }

用修饰的类叫抽象类。抽象类只能被继承，不能被实例化。用修饰的类叫最终类，只能被实例化，不能被继承。