java认证 习题 第03章 有答案版 OK 该试题还有第02、04章.doc

1、class Scoop{ static int thrower() throws Exception { return 42; } public static void main(String[] args) { try{ int x = thrower(); }catch(Exception e) { x++; }finally { System.out.println(“x = ” + ++x); } What is the result? A. x = 42 B. x = 43 C. x = 44 D. Compilation fails E. The code runs with no output 答案：D 变量x的作用域只在try块 D class Example { static int myArg=1; public static void main(String [] args) { Int myArg; System.out.println(myArg); } } Select all right answer: A、 this code compiles and displays 0 in the statndard output when run B、 this code compiles and displays 1 in the statndard output when run C、 this code does not compile because you can?t define a local variable names the same as static variable D、 this code doesn?t compile because the local vriable is used before it is initialized 局部变量 myArg;在使用前必须被初始化 3、what is the result when you compile and run the following code? D class Example { static int i; public static void main(String [] args) { System.out.println(i); } } Select all right answer: A、 Error variable I may not have been initialized B、 Null C、 1 D、 0 属性有默认值 4、what is the result when you compile and run the following code? class Example { static boolean Paddy; public static void main(String [] args) { System.out.println(Paddy); } } Select all right answer: A、 compile time error; B、 compilation and output of false; C、 compilation and output of true D、 compilation and output of null 属性有默认值 5、what is the result when you compile and run the following code? class Example { public static void main(String [] args) { int i=012; int j=034; int k=056; int l=078; System.out.println(i); System.out.println(j); System.out.println(k); } } Select all right answer: A、 prints 12，34 and 56 B、 prints 24，68and 112 C、 prints 10，28and 46 D、 compilation error 八进制数前加0，但l表示的数超过八进制数的范围了 B D 6、what is the result when you compile and run the following code? A class Example { void fun() { s