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Java Forum / General / June 2007mcq
Given: 1. class Super { 2. public float getNum() { return 3.0f; } 3. } 4. 5. public class Sub extends Super { 6. 7. } Which method, placed at line6, causes compilation to fail? A. public void getNum() { } B. public void getNum(double d) { } C. public float getNum() { return 4.0f; } D. public double getNum(float d) { return 4.0d; } >Given: >1. class Super { [quoted text clipped - 9 lines] >C. public float getNum() { return 4.0f; } >D. public double getNum(float d) { return 4.0d; } You forgot to include your instructor's e-mail. Without that we cannot send in the answers to your homework. I am afraid you will have to do it yourself. How about trying to compile the four different options provided and see which one fails? You never know, you might actually learn something. rossum Please refrain from multi-posting*, no matter how urgent your homework is.. * <http://www.physci.org/codes/javafaq.html#xpost> (X-post to c.l.j.p./h., w/ f-u to c.l.j.h. only) Andrew T. > Given: > 1. class Super { [quoted text clipped - 9 lines] > C. public float getNum() { return 4.0f; } > D. public double getNum(float d) { return 4.0d; } Q: Looking at those particular methods, which ones, placed anywhere, should get you the sack? A: all of them! On May 31, 11:28 pm, "Richard Reynolds" <richiereyno...@ntlworld.com> wrote: > > 1. class Super { > > 2. public float getNum() { return 3.0f; } [quoted text clipped - 13 lines] > > A: all of them! I tried compiling, all got compiled...... but answer is one of them not all.... > I tried compiling, all got compiled...... > but answer is one of them not all.... Uh, you might want to try those compilations again...  SignatureSteve Wampler -- swampler@noao.edu The gods that smiled on your birth are now laughing out loud. > On May 31, 11:28 pm, "Richard Reynolds" <richiereyno...@ntlworld.com> > wrote: [quoted text clipped - 19 lines] > I tried compiling, all got compiled...... > but answer is one of them not all.... The answer is A. According to Eclipse Severity and Description Path Resource Location Creation Time Id The return type is incompatible with test.Super.getNum() test/test test.java line 8 1180644466716 1 FX wrote: >> 1. class Super { >> 2. public float getNum() { return 3.0f; } [quoted text clipped - 8 lines] >> C. public float getNum() { return 4.0f; } >> D. public double getNum(float d) { return 4.0d; } > The answer is A. Well, you should really try javac, and not to do the OP's homework for them. To the OP: >>> I tried compiling, all got compiled...... >>> but answer is one of them not all.... Your period key is stuck. What went wrong? How come your compilations failed to find the error? How exactly did you test the compilation? Let's say you put your source in a directory called "$HOME/project/src/". Does your test look something like this? $ cd $HOME/project/src $ javac Sub.java SignatureLew ... > What went wrong? How come your compilations failed to find the error? > [quoted text clipped - 5 lines] > $ cd $HOME/project/src > $ javac Sub.java Also, check what "Super" is for that compilation. Given a pair of classes "Super" and "Sub" there might be other classes called "Super" lying around. For most choices of Super, Sub will compile with any of the choices of inserted line. Patricia Please refrain from multi-posting*, no matter how urgent your homework is.. * <http://www.physci.org/codes/javafaq.html#xpost> (X-post to c.l.j.p./h., w/ f-u to c.l.j.h. only) Andrew T. FX schrieb: > Given: > 1. class Super { [quoted text clipped - 9 lines] > C. public float getNum() { return 4.0f; } > D. public double getNum(float d) { return 4.0d; } Hy FX B and D are overloading (not overriding) and so can be easyly compiled. A and C are overriden methods. For overriden methods the return type must be the same (float in this case). So C will compile, but A will not. A is the solution (the only that fails). For more homework: Check out my program at http://www.santis.ch/training/java/jcp/selftester/indexe.php greets phi Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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