Java测试题北方银证0506.docVIP

Java测试题目 Q.1 1) public class ReturnIt{ 2) return Type methodA(byte x,double y){ 3) return (short)x/y*2; 4) } 5) } What is valid returnType for methodA in line 2? answer:double Q.2 Which of the following is legal way to construct a RandomAccessFile: A: RandomAccessFile(“data”,”r”); B: RandomAccessFile(“r”,”data”); C: RandomAccessFile(“data”,”read”); D: RandomAccessFile(“read”,”data”); answer:A Q.3 What is the effect of adding the sixth element to a vector created in the following manner: new Vector(5,10) ; A: An indexOutOfBounds exception is raised. B: The vector grows in size to a capacity of 10 elements C: The vector grows in size to a capacity of 15 elements D: Nothing, the vector will have grown when the fifith element was added answer:C Q.4 class ExceptionTest{ public static void main(String [] args){ try{ methodA(); }catch(IOException e){ System.out.println(“caught IOException”); }catch(Exception e) System.out.println(“caught Exception”); } } } If methodA() throws a IOException, what is the result? answer: caught IOException Q.5 What is the correct ordering for the import, class and package declarations when found in a single file? A: package import class B: class import package C: import package class D: package class import answer:A Q.6 Which methods can be legally applied to string object? A: equals(String) B: equals(Objce) C: trim(); D: round() E: toString() anwer:B,C,E Q.7 What is the parameter specification for the public static void main method? A: String args [] B: String [] args C: Strings args [] D: String args answer:AB Q.8 Which of the following are java keywords? A: goto B: malloc C: extends D: FALSE answer: C Q.9 What is the legal range of a byte integral type? A: 0 – 65535 B: -128 – 127 C: -32768 – 32767 D: -256 – 255 answer:B Q.10 Which of the following do not lead to a runtime error? A: “jo