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选择题 1: Whatwillbeprintedwhenyouexecutethefollowingcode? classX Yb=newY(); X() System.out.print(X); classY Y() System.out.print(Y); publicclassZextendsX Yy=newY(); Z() System.out.print(Z); publicstaticvoidmain(Stringargs) newZ(); Choices:What will be printed when you execute the following code? class X Y b = new Y(); X() System.out.print(X); class Y Y() System.out.print(Y); public class Z extends X Y y = new Y(); Z() System.out.print(Z); public static void main(String args) new Z(); Choices:A.Z B.YZ C.XYZ D.YXYZ 2: Whatwillbetheresultofexecutingthefollowingcode? publicstaticvoidmain(Stringargs) chardigit=a; for(inti=0;i10;i+) switch(digit) casex: intj=0; System.out.println(j); default: intj=100; System.out.println(j); inti=j; System.out.println(i); Choices:What will be the result of executing the following code? public static void main(String args) char digit = a; for (int i = 0; i =0:methodB(); System.out.println(i); publicvoidmethodB() System.out.println(Thevaluemustnotbenegative); publicstaticvoidmain(Stringargs) AssertTesttest=newAssertTest(); test.methodA(-10); What will happen when you attempt to compile and run the following code?(Assume that the code is compiled and run with assertions enabled.)public class AssertTestpublic void methodA(int i)assert i = 0 : methodB();System.out.println(i);public void methodB() System.out.println(The value must not be negative);public static void main(String args)AssertTest test = new AssertTest();test.methodA(-10); A.it will print -10 B.it will result in AssertionError showing the message-“the value must not be negative”. C.the code will not compile. D.None of these. 5: Whatresultsfromattemptingtocompileandrunthefollowingcode? publicclassTernary publicstaticvoidmain(Stringargs) inta=5; System.out.println(Valueis-+(a5)?9.9:9); Choices:What results from attempting to compile and run the following code? public class Ternarypublic static void main(String args)int a = 5;System.out.println(Value is - + (a 5) ? 9.9 : 9); Choices:A.prints: Value is - 9 B.Compilation error C. prints: Value is - 5 D.None of these 6:Which is the main() method return of a application? A.String B.byte C.char D.void 7: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 8: Whatwillhappenwhenyouattempttocompileandrunthefollowingcode? intOutput=10; booleanb1=false; if(b1=true)&(Output+=10)=20) System.out.println(Weareequal+Output); else System.out.println(Notequal!+Output); Choices:What will happen when you attempt to compile and run the following code? int Output = 10;boolean b1 = false; if(b1 = true) & (Output += 10) = 20) System.out.println(We are equal + Output); else System.out.println(Not equal! + Output); Choices:A.Compilation error, attempting to perform binary comparison on logical data type B.Compilation and output of We are equal 10. C.Compilation and output of Not equal! 20. D.Compilation and output of Not equal! 10. 9:在软件生命周期中，下列哪个说法是不准确的? A.软件生命周期分为计划、开发和运行三个阶段 B.在计划阶段要进行问题焉醛和需求分析 C.在开发后期要进行编写代码和软件测试 D.在运行阶段主要是进行软件维护 10: Whatistheresultwhenyoucompileandrunthefollowingcode? publicclassThrowsDemo staticvoidthrowMethod() System.out.println(InsidethrowMethod.); thrownewIllegalAccessException(demo); publicstaticvoidmain(Stringargs) try throwMethod(); catch(IllegalAccessExceptione) System.out.println(Caught+e); Choices:What is the result when you compile and run the following code? public class ThrowsDemo static void throwMethod() System.out.println(Inside throwMethod.); throw new IllegalAccessException(demo); public static void main(String args) try throwMethod(); catch (IllegalAccessException e) System.out.println(Caught + e); Choices:A.Compilation error B.Runtime error C.Compile successfully, nothing is printed. D.Inside throwMethod. followed by caught:java.lang.IllegalAccessExcption: demo 11: 给出下面的代码片断。下面的哪些陈述为错误的? 1)publicvoidcreate() 2)VectormyVect; 3)myVect=newVector(); 4)给出下面的代码片断。下面的哪些陈述为错误的?1) public void create() 2) Vector myVect;3) myVect = new Vector();4) A.第二行的声明不会为变量myVect分配内存空间。 B.第二行语句创建一个Vector类对象。 C.第三行语句创建一个Vector类对象。 D.第三行语句为一个Vector类对象分配内存空间 12: 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 13:假定a和b为int型变量,则执行下述语句组后,b的值为 a=1; b=10; do b-=a; a+; while (b-0); A.9 B.-2 C.-1 D.8 14:软件生命周期的瀑布模型把软件项目分为3个阶段、8个子阶段，以下哪一个是正常的开发顺序? A.计划阶段、开发阶段、运行阶段 B.设计阶段、开发阶段、编码阶段 C.设计阶段、编码阶段、维护阶段 D.计划阶段、编码阶段、测试阶段 15: Giventhefollowingclassdefinition: classA protectedinti; A(inti) this.i=i; whichofthefollowingwouldbeavalidinnerclassforthisclass? Selectvalidanswer:Given the following class definition:class Aprotected int i;A(int i)this.i=i;which of the following would be a valid inner class for this class?Select valid answer: A.class B B.class B extends A C.class B extends A B()System.out.println(“i=”+i); D.class B class A 16:In the following pieces of code, which one will compile without any error? A.StringBuffer sb1 = abcd; B.Boolean b = new Boolean(abcd); C.C: byte b = 255; D.float fl = 1.2; 简答题 17:试为下列关键字设计哈希表，要求所设计的表在查找成功时的平均查找长度不超过2.0。并请验证你造的哈希表的实际平均查找长度时否满足要求。(CHA，CAI，LAN，WEN，LONG，ZHAO，WU，LIU，CHEN，LI，WANG，CAO，YUN，CHANG，YANG) 18:有一篇英文文章(也就是说每个单词之间由空格分隔)，请找出“csdn”着个单词出现的次数，要求效率最高，并写出算法的时间级。 19: 找出以下程序错误。 ClassTest privateStringpar1; privateStringpar2; Test() p