单项选择题
A. Compilation succeeds.
B. Compilation fails because of an error at line 5.
C. Compilation fails because of an error at line 6.
D. Compilation fails because of an error at line 14.
E. Compilation fails because of an error at line 17.
单项选择题 WhichstatementistrueaboutassertionintheJavaprogramminglanguage？（）
单项选择题 booleanbool=true；if（bool=false）{System.out.println（“a”）；}elseif（bool）{System.out.println（“c”）；}elseif（!bool）{System.out.println（“c”）；}else{System.out.println（“d”）；}Whatistheresult？（）
单项选择题 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？（）