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单选题1. class SuperClass {  2. public a geta() {  3. return new a();  4. }  5. }  6. class SubClass extends SuperClass {  7. public b geta() {  8. return new b();  9. }  10. }  Which is true?()ACompilation will succeed if a extends b.BCompilation will succe

题目
单选题
1. class SuperClass {  2. public a geta() {  3. return new a();  4. }  5. }  6. class SubClass extends SuperClass {  7. public b geta() {  8. return new b();  9. }  10. }  Which is true?()
A

 Compilation will succeed if a extends b.

B

 Compilation will succeed if b extends a.

C

 Compilation will always fail because of an error in line 7.

D

 Compilation will always fail because of an error in line 8.


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