上海神机软件有限公司.doc

选择题 1:Which of the following answer is correct to express the value 8 in octal number? A.010 B.0x10 C.08 D.0x8 2:Which statement about listener is true? A.Most component allow multiple listeners to be added. B.If multiple listener be add to a single component, the event only affected one listener. C.Component don?t allow multiple listeners to be add. D.none 3: Givethefollowingjavaclass: publicclassExample staticintx=newint15; publicstaticvoidmain(Stringargs) System.out.println(x5); Whichstatementiscorrected?Give the following java class:public class Examplestatic int x=new int15;public static void main(String args)System.out.println(x5);Which statement is corrected?A.When compile, some error will occur. B.When run, some error will occur. C.Output is zero. D.Output is null. 4: Givethefollowingjavasourcefragement: /pointx publicclassInteresting /dosomething WhichstatementiscorrectlyJavasyntaxatpointx?Give the following java source fragement:/point xpublic class Interesting/do somethingWhich statement is correctly Java syntax at point x? A.public class MyClass/do other thing B.static int PI=3.14 C.class MyClass/do something D.none 5: Whatwillbetheresultofexecutingthefollowingcode? booleana=true; booleanb=false; booleanc=true; if(a=true) if(b=true) if(c=true)System.out.println(Somethingsaretrueinthisworld); elseSystem.out.println(Nothingistrueinthisworld!); elseif(a&(b=c)System.out.println(Itstooconfusingtotellwhatistrueandwhatisfalse); elseSystem.out.println(Heythiswontcompile); Choices:What will be the result of executing the following code? boolean a = true; boolean b = false; boolean c = true; if (a = true) if (b = true) if (c = true) System.out.println(Some things are true in this world); else System.out.println(Nothing is true in this world!); else if (a & (b = c) System.out.println(Its too confusing to tell what is true and what is false); else System.out.println(Hey this wont compile); Choices:A.The code wont compile B.Some things are true in this world will be printed C.Hey this wont compile will be printed D.None of these 6: Whatwillbetheresultofexecutingthefollowingcode? /Filename;SuperclassX.java packagepackageX; publicclassSuperclassX protectedvoidsuperclassMethodX() intsuperclassVarX; /FilenameSubclassY.java 1.packagepackageX.packageY; 2. 3.publicclassSubclassYextendsSuperclassX 4. 5.SuperclassXobjX=newSubclassY(); 6.SubclassYobjY=newSubclassY(); 7.voidsubclassMethodY() 8. 9.objY.superclassMethodX(); 10.inti; 11.i=objY.superclassVarX; 12. 13. Choices:What will be the result of executing the following code? / Filename; SuperclassX.javapackage packageX; public class SuperclassXprotected void superclassMethodX()int superclassVarX; / Filename SubclassY.java1.package packageX.packageY;2.3.public class SubclassY extends SuperclassX4.5.SuperclassX objX = new SubclassY();6.SubclassY objY = new SubclassY();7.void subclassMethodY()8.9.objY.superclassMethodX();10.int i;11.i = objY.superclassVarX;12.13. Choices:A.Compilation error at line 5 B.Compilation error at line 9 C.Runtime exception at line 11 D.None of these 7:在下述选项时,没有构成死循环的程序是 A.int i=100 while (1) i=i%100+1; if (i100) break; B.for (;); C.int k=1000; do +k; while(k=10000); D.int s=36; while (s);-s; 8:Which fragments are not correct in Java source file? A.package testpackage; public class Test/do something. B.import java.io.*; package testpackage; public class Test/ do something. C.import java.io.*; class Person/ do something. public class Test/ do something. D.import java.io.*; import java.awt.*; public class Test/ do something. 9: 下述程序代码中有语法错误的行是（）。 inti,ia10,ib10;/*第一行*/for(i=0;i=9;i+)/*第2行*/iai=0;/*第3行*/ib=ia;/*第4行*/下述程序代码中有语法错误的行是（ ）。int i,ia10,ib10; /*第一行*/for (i=0;i0) System.out.println(“Finish”); Whichwellbeoutput:Give the following code:public class Examplepublic static void main(String args )int l=0;doSystem.out.println(“Doing it for l is:”+l);while(-l0)System.out.println(“Finish”);Which well be output: A.Doing it for l is 3 B.Doing it for l is 1 C.Doing it for l is 2 D.Doing it for l is 0 17: ThefollowingcodeisentirecontentsofafilecalledExample.java,causespreciselyoneerrorduringcompilation: classSubClassextendsBaseClass classBaseClass() Stringstr; publicBaseClass() System.out.println(“ok”); publicBaseClass(Strings) str=s; publicclassExample publicvoidmethod() SubClasss=newSubClass(“hello”); BaseClassb=newBaseClass(“world”); Whichlinewouldbecausetheerror?The following code is entire contents of a file called Example.java,causes precisely one error during compilation: class SubClass extends BaseClass class BaseClass() String str; public BaseClass() System.out.println(“ok”); public BaseClass(String s) str=s; public class Example public void method() SubClass s=new SubClass(“hello”); BaseClass b=new BaseClass(“world”); Which line would be cause the error? A.9 B.10 C.11 D.12 18:设有变量说明语句int a=1,b=0; 则执行以下程序段的输出结果为（ ）。 switch (a) case 1: switch (b) case 0:printf(*0*);break; case 1:printf(*1*);break; case 2:printf(*2*);break; printf(n); A.*0* B.*0*2* C.*0*1*2* D.有语法错误 19:What is written to the standard output given the following statement:System.out.println(4|7); Select the right answer: A.4 B.5 C.6 D.7 20:Which is the main() method return of a application? A.String B.byte C.char D.void 21:Math.round(11.5)等於多少? A.11 B.12 C.11.5 D.none 简答题 22:说出ArrayList,Vector, LinkedList的存储性能和特性。 23:找出32位数中是回文数，且其开方为整数的数。 24:X博士是一个研究儿童智力开发方法的科学家，他为幼儿教育领域做出了许多贡献。最近，X博士正在研究一种适合儿童的游戏，用以辅助发展儿童的观察力、注意力和思维能力。经过连日的构思，X博士终于设计出了一种游戏：彩球游戏。 彩球游戏是一种单人参与的游戏，游戏首先给出一串由许多不同颜色的小球组成的小球序列，以及一个整数参数M（M2）。一段连续的具有相同颜色的小球序列称为连续同色序列。小孩，即游戏参与者，每次可以向任意一段连续同色序列插入一个同色小球，使该序列的长度加一。当一段连续同色序列在插入一个同色小球后其长度达到M时，该序列就会爆炸消失，然后原序列两边的其余小球会重新连成一串，如果两段相同颜色的连续同色序列在此时连接在一起，它们就会合并形成一段新的连续同色序列。如果新形成的连续同色序列长度达到M，这段序列也会爆炸消失，然后重复上述过程，直到没有新的长度达到M的连续同色序列出现为止。游戏的目标很简单，就是插入尽量少的小球，使得所有小球都爆炸消失掉。 通过长时间的游戏和不断提高游戏水平，这个游戏可以很好地开发儿童的观察力、注意力和思维能力。但是X博士仍然面临着一个困难的问题，他还需要设计出一个游戏演示AI程序，可以以最优的方式（即插入的小球数量最小）进行游戏，用于游戏教学，或者在游戏中对小孩给出提示。X博士并不擅长此类程序，因而他无法完成这个任务，你可以帮助他吗？ 25:什么是接口？为什么要定义接口？接口与抽象类有何异同？ 26:用最简单的方法判断一个数是否是2的指数次幂。 27:有一百个整数,其中有负数,找出连续三个数之和最大的部分. 28:+i与i+的区别到底怎样？ 29:请写一个java程序实现线程连接池功能？ 30:lucene的索引使用的什么数据结构？ 31:hibernate有那些抓取策略？