java程序分析题

1、程序分析题(共6 小题，每小题 5 分，共 30 分)1. 写出下面程序的运行结果。public class ArrayExamplepublic static void main(String args)long a=2011,2012,2013,2014;long b=100,200,300,400,500;b=a;System.out.println(Length=+b.length);System.out.println(b0=+b0);运行结果： Length=4 b0=20112. 请写出下面程序的运行结果。class MyStringpublic String getString

2、(String s)StringBuilder str = new StringBuilder (); for(int i = 0;i s.length();i+) if(i % 2 = 0) char c = s.charAt(i); str.append(c);return new String(str);public class StringExercisepublic static void main(String args)String s = ABCDEFGH;MyString ms = new MyString();System.out.println(ms.getString(

3、s);3. 请写出下面程序的运行结果。class EXA int add(int x,int y) return x+y;class EXB extends EXA int add(int x,int y) return x-y;public class ExtendsExercise public static void main(String args) EXA a=new EXA();System.out.println(a.add(80,20);a=new EXB ();System.out.println(a.add(80,20);运行结果： 100604. 请写出下面程序运行的结果

4、。class ex int u, v;void p2(int x, int y) int i, j;for (i=1; i=x;i+) j = y+i;System.out.print(j+ ); void p( ) u=3; v=2; p2(u, v);System.out.println();u+=v; v*=u; p2(u, v);class Exam11 public static void main(String args) ex A = new ex();A.p();运行结果： 3 4 511 12 13 14 155. 请写出下面程序的运行结果。public class Rege

5、xTesterpublic static void main(String args)String regex=A(13d|15036-9|18089)d8$”;String number1 String number2=A1305516699$;String number3String number4System.out.println(number1.matches(regex);System.out.println(number2.matches(regex);System.out.println(number

6、3.matches(regex);System.out.println(number4.matches(regex);运行结果： truefalsetruefalse6. 写出下面程序的运行结果。public class Figure public int xPosition,yPosition;public void draw()System.out.println(drawing Figure);public class Rectangle extends Figurepublic void draw()System.out.println(drawing Rectangle);publi

7、c class Circle extends Figurepublic void draw()System.out.println(drawing Circle);public class Testerpublic static void main(String args)Figure figures = new Figure3;figures0=new Figure();figures1=new Rectangle();figures2=new Circle();for(int i=0;ifigures.length;i+)figuresi.draw();运行结果： drawing Figu

8、redrawing Rectangle drawing Circle7. 写出下面程序的运行结果。import java.util.*;public class ArrayTesterpublic static void main(String args)int arrays1 = 1,3,5;int arrays2 = 2,4,6;int arrays3 = new int3;arrays2=arrays3;for(int i=0;iarrays3.length;i+) arrays3i=arrays1i;for(int i=0;iarrays2.length;i+) System.out.

9、println(arrays2i);运行结果： 1358. 写出下面程序的运行结果。public class ExceptionExample public static void main(String args)tryString str = new String();char mychars = str.toCharArray();for(int i=0;i=mychars.length;i+) System.out.print(mycharsi);if(i=mychars.length-1) System.out.println();catch(ArrayIndexOutOfBound

10、sException e)System.out.println(ArrayIndexOutOfBounds!);catch(Exception e)System.out.println(Exception!);finallySystem.out.println(Program End!);运行结果： ArrayIndexOutOfBounds!Program End!9. 写出下面程序的运行结果。public class Exam4String str=new String(aust);char ch = s,s,j;public static void main(String args)Ex

11、am4 ex = new Exam4();ex.change(ex.str,ex.ch);System.out.println(ex.str+ and);System.out.println(ex.ch);public void change(String str,char ch) str = jsjxy;ch0 = j;运行结果： aust andjsj10. 写出下面程序的运行结果。import java.util.*;public class CollectionTesterpublic static void main(String args)Vector teamList = new

12、 Vector(); teamList.add(Zhang Wei);teamList.add(Liu Hong); teamList.add(Yu Hongshu); teamList.set(2,Liu Na);teamList.remove(0);teamList.remove(0);System.out.println(teamList.get(0);Hashtable ht = new Hashtable(); ht.put(key,Zhang Wei);ht.put(key,Liu Hong);Iterator its = ht.values().iterator();while(

13、its.hasNext()System.out.println(its.next();运行结果： Liu NaLiu Hong11. 请写出下面程序的输出结果。public class Exam extends TTpublic static void main(String args)Exam t=new Exam (Tom.);public Exam (String s)super(s);System.out.print(How are you?);public Exam ()this(I am Jack.);class TTpublic TT()System.out.print(Hi!)

14、;public TT(String s)this();System.out.print(I am +s);运行结果： Hi ！ I am Tom.How ar you?12. 请写出下面程序的输出结果。public class MethodParameterString str=new String(Java);char ch = A,S,P;public static void main(String args)MethodParameter ex = new MethodParameter();ex.change(ex.str,ex.ch);System.out.print(ex.str+

15、 and);System.out.println(ex.ch);public void change(String str,char ch)str = Android;ch0 = J;运行结果： Java and JSP13. 写出下面程序的运行结果。public class PhoneValidation public static void main(String args) String regex = A(13d|15036-9|1889)d8$”;String number =number=number.replace(5, 6);boolean match

16、 = number.matches(regex);System.out.println(number + n + match); 运行结果：false14. 写出下面程序的运行结果。import java.io.* ;public class Exam8 public static void main(String args ) int i ;int a = 11,22,33,44,55,66,77,88,99 ;for (i = 0 ; i = a.length / 2 ; i + )System.out.print( ai+aa.length-i-1+ );Sys

17、tem.out.println(); 运行结果： 110 110 110 110 11015. 写出下面程序运行的结果。class Exam9 public static void main(String args) people p=new graduate();class peopleString name;int age;people()people(String name,int age) =name;this.age=age;System.out.println(In people); class student extends peopleString schoo

18、l;student()this(null,0,null);System.out.println(In student1); student(String name,int age,String school) super(name,age);this.school=school;System.out.println(In student2); class graduate extends studentgraduate()System.out.println(In graduate); 运行结果： In peopleIn student2In student1In graduate16. 写出

19、下面程序运行的结果。public class Exam10String str=new String(good);charch=a,b,c;public static void main(String args) Exam10 ex=new Exam10();ex.change(ex.str,ex.ch);System.out.print (ex.str+ and );System.out.print (ex.ch);public void change(String str,char ch)str=test ok;ch0=g;运行结果： good and abc17. 写出下面程序运行的结果

20、。class Employeestatic void expenseAllowance()System.out.println(in class Employee!); class Manager extends Employeestatic void expenseAllowance()System.out.println(in class Manager!); class exam12public static void main(String args)Manager man = new Manager();Employee emp1 = new Employee();Employee

21、emp2 = (Employee)man;man.expenseAllowance();emp1.expenseAllowance();emp2.expenseAllowance();运行结果： in class Manager!in class Employee!in class Employee!18. . 写出下面程序的运行结果。public class ExceptionExample public static void main(String args)tryString str = new String(Thinking in Java);char mychars = str.toC