java程序分析题.doc

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 MyString public String getString(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 StringExercise public static void main(String args) String s = ABCDEFGH;MyString ms = new MyString();System.out.println(ms.getString(s);运行结果：ACEG 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：100 604. 请写出下面程序运行的结果。 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 5 11 12 13 14 155. 请写出下面程序的运行结果。 public class RegexTesterpublic static void main(String args) String regex=(13d|15036-9|18089)d8$; String number1 String number2=1305516699$; String number3 String number4 System.out.println(number1.matches(regex); System.out.println(number2.matches(regex); System.out.println(number3.matches(regex); System.out.println(number4.matches(regex); 运行结果：true false true false 6. 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);public 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 Figure drawing Rectangle drawing Circle7. 写出下面程序的运行结果。 import java.util.*; public class ArrayTester public 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.println(arrays2i); 运行结果：1 3 58. 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(ArrayIndexOutOfBoundsException 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 Exam4 String str=new String(aust); char ch = s,s,j;public static void main(String args) Exam4 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 and jsj10. 写出下面程序的运行结果。 import java.util.*; public class CollectionTester public static void main(String args) Vector teamList = new 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(its.hasNext() System.out.println(its.next(); 运行结果：Liu Na Liu Hong 11. 请写出下面程序的输出结果。public class Exam extends TT public 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 TT public TT() System.out.print(Hi!); 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 MethodParameter String 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+ 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 = (13d|15036-9|1889)d8$; String number = number=number.replace(5, 6); boolean match = 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+ ); System.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 school;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. 写出下面程序运行的结果。public class Exam10 String 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。class Employee static void expenseAllowance() System.out.println(in class Employee!); class Manager extends Employee static void expenseAllowance() System.out.println(in class Manager!); class exam12 public static void main(String args)Manager man = new Manager(); Employee emp1 = new Employee(); Employee 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.