java工程师考试

1、第一题： ( 过程可以写在后面)学校的毕业话剧演出由四个小美女来出演小红帽、美羊羊、女巫和公主的角色。没人在排练时的角色与演出时的角色不同。排练时出演小红帽的人会撒谎，通过如下消息，请判断四人在演出和排练时分别出演什么角色。梅：“排练时，兰的角色是演出时竹的角色。”兰：“菊排练时扮演的是美羊羊。”竹：“演出时我演公主。”菊：“兰演出时扮演的是美羊羊。”第二题： 解数独题( 数独是九宫格 ( 即 3 格宽 x3 格高 ) ) 正方形状，每一格又细分为一个九宫格，在没一个小九宫格中，分别填上 19 个数字，让每一个大九宫格没一列，没一行的数字都不重复。81746948338527569665118

2、31、Which line contains a constructor in this class definition?精品文库public class Counter/(1)int current ,step;public Counter(int startVaue,int stepValue)/(2)set(startValue);setStepValue(steValue);public int get()return current;/(3)public void set(int value)current=value;/(4)public void setStepValue(in

3、t stepValue)step=stepValue;/(5)1)Code marked with (1) is a constructor2)Code marked with (2) is a constructor3)Code marked with (3) is a constructor4)Code marked with (4) is a constructor5)Code marked with (5) is a constructor2、An instance member.1)is also called a static member2)is always a variabl

4、e3)is never a method4)belongs to a single instance,not to the class as a whole5)always represents an operation3、Given the following class,which statements can be inserted at position I without causing the code to fail compilation?public class Q6db8int a ;int b=0;static int c;public void m()欢迎下载2精品文库

5、int d;int e=0;/Position 11)a+2)b+3)c+4)d+5)e+7、What is wrong with the following code?Class MyException extends ExceptionPublic class qb4abPublic void foo()TryBar();finallyBaz();catch(MyException e)Public void bar() throws MyExceptionThrow new Exception();Public void baz() throws RuntimeExceptionThro

6、w new RuntimeException();4、) Since the method foo() does not catch the exception generated by the method baz(), it must declare the RuntimeException in its throws clause.欢迎下载36.7.精品文库5、) A the try block cannot be followed by both a catch and a finally block.6、) An empty catch block is not allowed.7、

7、) A catch block cannot follow a finally block.8、) A finally block must always follow one or more catch blocks.5、What will happen when you attempt to compile and run the following program by passing the Test class to the Java interpreter?Class TestPublic static void main“hello ”);Select the one right

8、 answer.the program does not compile because main() is not defined correctly.The program compiles but when you try to run the interpreter complies that it cannot find the main() method it needs to run.C) the program compiles but you cannot run it because the class is not declared as public .D) the p

9、rogram compiles and runs without an error but does not display anything in the standard output .E) the program compiles and displays “hello ”in the standard output when you in run it.6、Give those code snippets:Boolean b1=new Boolean(true);Boolean b2=new Boolean(true);Which expressions are legal Java

10、 expressions that return true?Select all valid answer.3. b1=b24. b1.equals(b2) C) b1&b2D) b1|b2E) b1&&b2F) b1|b2欢迎下载4精品文库7、Given this code snippet:trytryThis();return;catch(IOException x1)return ;catch(Exception x2)return ;finallyWhat will appear in the standard output if try This() thro

11、ws a NumberFormatException?Select the one right answer.a)Nothingb)"exception 1",followed by "finally"c)"exception 2",followed by "finally"d)"exception 1"e)"exception 2"选择:C8、Giver these class definitions;class Superclassclass Subclass1 exte

12、nds Superclassclass Subclass2 extends Superclassand these objects;Superclass a =new Superclass();欢迎下载5精品文库Subclass1 b=new Subclass1();Subclass2 c=new Subclass2();which of the following explains the result of the statement; b=(Subclass1)c;Selected the one right answer;a)Illegal at compile timeb)Legal

13、 at compile time but possibly illegal at runtimec)Definitely legal at runtime9、简述以下代码是在做什么事情？”);Throw new RuntimeException( “getEJBHome could tretrieve initial context ”10: 请从空白处填写代码，满足以下功能：A) 从请求中得到用户名和口令（请求通过 web 浏览器中的 HTML 页面提交， 页面中用户名对象名为 userName, 口令对象名为 password ）B) 如果用户名为 ”admin ”, 口令为 passwo

14、rd , 则讲登陆成功，将页面转到loginSuccess.jsp 页面，并在session 存放用户名（ username ）和密码(password)C( 如果用户名和空灵为其他值，转到error.jspPublic class TestServlet extends HttpServlet欢迎下载6精品文库Public void service(HttpServletRequest request,HttpServletResponse resopnse)throws ServletException,IOException/Include following lins in all s

15、ervlet.Try/请在此添写代码If(userName.equals(“admin ”) && password.equals(“password ”)request.getsession.setAttribute("username",”admin ”);request.getsession.setAttribute("password",”password ”);Request.sendRedirect(“loginSuccess.jsp ”);elseRequest.sendRedirect(“error.jsp ”);catc

16、h(Exception e)典道的笔试分A-B 卷，题型有：1. 选择题 30 道（每道 2 分 共 60 分）2. 代码阅读题 4 道（每道 5 分 共 20 分）3. 程序逻辑题 2 道(每道 10 分 共 20 分)不管是 A-B 卷，考察的范围都是基础知识，这个是和几个做B 卷的同学那了解到的，主要的考点如下：欢迎下载7精品文库考点名称考试频率难易度备注数组高易值传递与址传高中递Main 函数低中线程低难Swing 与 awt低中Ascii 码高难请务必记住常用 ascii 码，代码题都有考运算符优先级低中去网上百度一下Oop 思想高中方法重载与重高易写包低易方法与类的命低易名规则逻辑

17、思维高难其他的记得不是很清楚了，不过不会超过基础知识这个范围，但光靠书（accp6.0 ）上那些还不够，建议找些参考书学习一下，越基础越好。以下是 A 卷代码阅读题8、建一个数组，顺序输出10 位数，然后把这10 位数再倒序输出欢迎下载8精品文库publicclassTest publicstaticvoidmain(String args) int arr=newint1,2,3,4,5,6,7,8,9,10;System.out .println("-顺序输出 -");for( inti = 0; i < arr.length; i+) System.out .p

18、rint(arri+",");System.out .println();System.out .println("-倒叙输出 -");for( intj = arr.length-1; j >=0 ; j-) System.out .print(arrj+",");9、考的是方法重载，它是将两个方法的参数顺序颠倒了一下，看题的时候要注意。3.publicclassTest5 publicstaticvoidmain(Stringargs)int arr=newint1,2,3,4,5,6,7,8;a(arr);b(arr);a

19、(arr);staticvoida(intarr)for( inttemp:arr)欢迎下载9精品文库System.out .println(temp);staticvoidb(intarr)for( inti=0;i<arr.length;i+)arri*=i;输出结果是： 56以下是 A卷手写代码题：8.请用 1、 2、 3、 4 组成 N个数值不重复 且个十百位都不重复 的 3位数 , 一共有几个？分别是什么？共有： 24 个分别是：123,124,132,134,142,143,213,214,231,234,241,243,312,314,321,324,341,342,412

20、,413,421,423,431,432,参考答案：Int count=0;For(int i=1;i<=4;i+)For(int j=1;j<=4;j+)For(int k=1;k<=4;k+)If(i!=j&&i!=k&&j!=k)欢迎下载10精品文库Count+;一共有 24 个，公式： 4*3*2=24，具体数学公式请见排列算法。9.查询子串在父串中出现的次数：参考答案：设： str1为父串， str2为字串，则：publicclassTest6 publicstaticvoidmain(Stringargs)Stringstr1="hdsajkfhuisadhifnokfasdfdasdoksdfsdsfsok"String str2="ok"String temp="" ;intcount=0;for(temp=str1;temp!=null&&str2.length()<=s