JavaSE程序代碼閱讀題(共21頁(yè))

1、精選優(yōu)質(zhì)文檔-傾情為你奉上JavaSE程序代碼閱讀題（）1. 閱讀下面的代碼，然后寫(xiě)出程序運(yùn)行結(jié)果。 public class Test2 static boolean foo(char c) System.out.print (c); return true; ) public static void main(String argv) int i=0; for (foo(A)j foo(B)&&(i<2);foo(C) i+; foo(D);2. 如下程序代碼 a=0;c=0; do -c; a=a-1 while(a>0); 循環(huán)結(jié)束后，c的值是（）3. 給出

2、下面的代碼：if(x>0)System.out.println("first"),)else if(x>-3)System.out.println("second");)elseSystem.out.println("third");)x的取值在什么范圍內(nèi)時(shí)將打印字符串”second”4. 閱讀下面程序,寫(xiě)出其輸出:class PersonPerson()System.out.println("1");public void printValue(int i,int j)System.out.print

3、ln("2");public void printValue(int i)System.out.println("3");public class Teacher extends PersonTeacher()System.out.println("4");5. 下面程序有什么問(wèn)題，請(qǐng)指正。public class Personint arr = new int ;public static void main(String a)6. 寫(xiě)出下列代碼的輸出結(jié)果。public class Test publi

4、c int aMethod() static int i = 0; i+;return i;    public static void main (String args) Test test = new Test();test.aMethod();int j = test.aMethod();System.out.println(j)

5、;7. 下列代碼編譯運(yùn)行結(jié)果。public class Demo    public int add(int a,int b)        try            return a+b;        

6、catch(Exception e)            System.out.println(“catch 語(yǔ)句塊”);        finally            System.out.println(“finally 語(yǔ)句塊”);&#

7、160;               return 0;        public static void main(String args)        Demo demo = new Demo

8、();        System.out.println(“和是：”+demo.add(9,34);    8. 下列代碼編譯運(yùn)行結(jié)果。 public static void main(String args) try String name = null; System.out.println(name.length(); catch (SQLException e) System.out.println(“有異常出現(xiàn)”); finally System.out.prin

9、tln(“執(zhí)行結(jié)束”);9. 下列代碼編譯運(yùn)行結(jié)果。 public class Animal public Animal() System.out.println(“I am an animal”);public class Cat extends Animal public Cat () System.out.println(“I am a cat”);public class Test public static void main (String args) Cat cat = new Cat();10. 下列代碼編譯運(yùn)行結(jié)果。public class Person private St

10、ring name; public Person() name = “小明”;public Person(String name) this(); System.out.println(“大家好，我是” + );public static void main(String args) Person person = new Person(“小紅”);11. 下列代碼編譯運(yùn)行結(jié)果。 public static void main(String args) int i= 3; do if (i-%2 = 0) System.out.println(i); break;System

11、.out.println(i); while (i> 0);12. 下列代碼編譯運(yùn)行結(jié)果。public class Vehicle public void run() System.out.println(“Vehicle is running”);public class Car extends Vehicle public void run() System.out.println(“Car is running”);public static void main(String args) Vehicle vehicle = new Car(); vehicle.run();13.

12、下列代碼編譯運(yùn)行結(jié)果。double i = 25;int j = 5;int result = i / j;System.out.println(result);14. 下列代碼編譯運(yùn)行結(jié)果。public class Astatic System out printle(“a”) public A()System out printle(“b”)public class B extends Astatic System out printle(“1”) public B()System out printle(“2”)public class Test public static void m

13、ain(String args)A ab = new B() ; ab = new B(); 15. 下列代碼編譯運(yùn)行結(jié)果。import java.util.HashSet;import java.util.Set;public class ShortSet public static void main (String ars) Set<Short> s = new HashSet<Short>(); for(Short i=0;i<100;i+) s.add(i); s.remove(i-1); System.out.println(s.size(); 16.

14、 下列代碼編譯運(yùn)行結(jié)果。int total = 0; for ( int i = 0; i < 4; i+ )if ( i = 1) continue; if ( i = 2) break;             

15、;                 total += i;  17. 下列代碼輸入2時(shí)的運(yùn)行結(jié)果。public int getValue(int i)          int result = 0;  

16、60;      switch (i)              case 1:                 result = result + i; &#

17、160;           case 2:                 result = result + i * 2;          &#

18、160;  case 3:                 result = result + i * 3;          return result;      1

19、8. 給出以下代碼，請(qǐng)問(wèn)插入什么語(yǔ)句后可以依次打印輸出數(shù)組中的每個(gè)元素？ class Example public static void main(String args) int arr=new int4; arr0=new int4; arr1=new int3; arr2=new int2; arr3=new int1; for(int n=0;n<4;n+) System

20、.out.println(/*插入語(yǔ)句處*/);   19. 下列代碼編譯運(yùn)行結(jié)果。 public static void main(String args) int i= 3; do if (i-%2 = 0) System.out.println(i); break;System.out.println(i); while (i> 0);20. 下列代碼編譯運(yùn)行結(jié)果。public class Testpublic static changeStr(String str)str="jettech"public static void m

21、ain(String args)String str="welcome"changeStr(str);System.out.println(str);21. 下列代碼編譯運(yùn)行結(jié)果。String a = "a"；String b = "b"；String c = "a'+"b"；String d = a+b；System.out.print(a="a");System.out.print(c="ab");System.out.print(d=c);System

22、.out.print(new String("a")+b=c);22. 下列代碼編譯運(yùn)行結(jié)果。public class SwitchTest public static void main(String args) System.out.println(switchlt(4);public static int switchlt(int x) int j=1;switch (x) case 1:j+;case 2:j+;case 3:j+;case 4:j+;case 5:j+;default:j+;return j+x;23. 下列代碼編譯運(yùn)行結(jié)果。public clas

23、s HasStatic private static int x =100; public static void main(String args) HasStatic hs1 = new HasStatic();hs1.x+;HasStatic hs2 = new HasStatic();hs2.x+;hs1 = new HasStatic();hs1.x+;HasStatic.x-;System.err.println("x="+x);24. 下列代碼編譯運(yùn)行結(jié)果。public class Example public static void main(String

24、args) int i,j;for ( i=0,j = 0; i+j< 20; +i,j+=i-) System.out.println(i+j);25. 下列代碼編譯運(yùn)行結(jié)果。public class Apublic static void main(String args)String A = "A"String B = "A"String c = "new String("A");System.out.print(a=b);System.out.print("");System.out.pri

25、nt(a=c);System.out.print("");System.out.print(a.equals(c);System.out.print("");26. 下列代碼編譯運(yùn)行結(jié)果。public class Apublic A()System.out.print("A"); public static void main(String args) A a= new A(); B b=new B(); class B extends Apublic B()System.out.print("B");27. 下列

26、代碼編譯運(yùn)行結(jié)果。public class Apublic String method1()tryif(true)throw new Exception();System.out.print("D");return "A"cactch(Exception e)System.out.print("E");return "B"finalSystem.out.print("F"); public static void main(String args) System.out.print(new A(

27、).method1(); 28. 下列代碼編譯運(yùn)行結(jié)果。public class TestTjsinfoString str = new String("good");char ch = 'w','e','l','l'public static void main(String args) TestTjsinfo ex =new TestTjsinfo();ex.change(ex.str,ex.ch);System.out.print(ex.str+"and");System.out.pr

28、int(ex.ch);public void change (String str,char ch)str ="test ok"ch0='g'29. 下列代碼哪幾行會(huì)出錯(cuò)。1) public void test()2) int i,j,k;3) i=50;4) while(i>0)5) j=i=2;6) System.out.print("The value of j is "+j);7) k=k+1;8) i-；9) 10) 30. 下列代碼編譯運(yùn)行結(jié)果。public class MyClass static int i; pub

29、lic static void main(String argv) System.out.println(i); 31. 下列代碼編譯運(yùn)行結(jié)果。public class Test3 public static void main(String args) System.out.print(100%3); System.out.print(","); System.out.println(100%3.0); 32. 下列代碼編譯運(yùn)行結(jié)果。void complicatedExpression() int x=20, y=30; boolean b; b=x>50&

30、&y>60|x>50&&y<-60|x<-50&&y>60|x<-50&&y<-60; System.out.println(b); 33. 以下程序的功能是：求n!。請(qǐng)?jiān)谙铝谐绦蛑刑钊胝_的語(yǔ)句 class FactorialTest static long Factorial(int n) if(n=1) return 1; else _ public static void main(String a) int n=8; System.out.println(n+"!="

31、+Factorial(n); 下列代碼編譯運(yùn)行結(jié)果。34. 下列代碼編譯運(yùn)行結(jié)果。class Parent void printMe() System.out.println("parent"); class Child extends Parent void printMe() System.out.println("child"); void printall() super.printMe(); this.printMe(); printMe(); public class Test_this public static void main(Str

32、ing args) Child myC=new Child(); myC.printall(); 35. 下列代碼編譯運(yùn)行結(jié)果。public class Short public static void main(String args) StringBuffer s=new StringBuffer("Hello"); if(s.length()>5)&&(s.append("there").equals("False"); System.out.println("value is "+s)

33、; 36. 下列代碼編譯運(yùn)行結(jié)果。String str1 ="hello"String str2="he"+new String("llo");System.err.println(str1=str2)；37. 下列代碼編譯運(yùn)行結(jié)果。public class NULLpublic static void haha()System.out.print("haha");public static void main(String args) (NULL)null).haha();38. 下列代碼編譯運(yùn)行結(jié)果。publi

34、c static void main(String args)Thread t = new Thread()public void run()pong();t.run();System.out.print("ping");static void pong()System.out.print("pong");39. 下列代碼編譯運(yùn)行結(jié)果。public class CollectionClassifilerpublic static String classify (Set s)return"Set"public static Strin

35、g classify ( l)return"List"public static String classify (Collection c )return"Unknown Collection"public static void main(String args)Collection test=new Collectionnew HashSet(),/A Setnew ArrayList(),/ A Listnew HashMap().values()/Neither Set nor List;for(inti =0;i<test.length

36、;i+)System.out.print(classify(testi);40. 下面這段程序，當(dāng)輸入為2時(shí)返回值是多少?public static int count (int i) int result =0;switch (i) case 1:result = result + i ;case 2:result =result + i*2;case 3: result = result+i*3return result;41. 下列代碼編譯運(yùn)行結(jié)果。String s=new String(“abcdefg”);for(int i=0;i<s.length();i+=2)System

37、.out.print(s.charAt(i);42. 下列代碼運(yùn)行后foo的值是多少。int index = 1;Boolean test = new Boolean3;Boolean foo = test index;43. 下列代碼編譯運(yùn)行結(jié)果。public class Testpublic static void main(String arg)int i= 5;doSystem.out.println("i");while(-i>5);System.out.println("finished");44. 下列代碼編譯運(yùn)行結(jié)果。public

38、class HasStatic private static int x =100; public static void main(String args) HasStatic hs1 = new HasStatic();hs1.x+;HasStatic hs2 = new HasStatic();hs2.x+;hs1 = new HasStatic();hs1.x+;HasStatic.x-;System.err.println("x="+x);45. 下列代碼編譯運(yùn)行結(jié)果。import java.io.*;public class B public static vo

39、id main(string args) int i=12; System.out.println(i+=i-=i*=i);46. 下列代碼編譯運(yùn)行結(jié)果。 public class Test public int method() static int x = 0； x+; return x; public static void main(String args) Test test = new Test(); test.method(); int y = test.method(); System.out.println(y); 47. 下列代碼編譯運(yùn)行結(jié)果。public class Te

40、stpublic static void main(String args) System.out.println(6 + 6 + “aa” + 6 + 6);48. 傳遞4，0來(lái)運(yùn)行下列代碼中的方法divide(int a,int b)，結(jié)果是()public void divide(int a, int b)  try  int c = a / b;  catch (Exception e)  

41、;System.out.print("Exception");  finally  System.out.println("Finally");  49. 排查錯(cuò)誤，請(qǐng)查看下列每題是否有錯(cuò)誤并且說(shuō)明錯(cuò)誤原因1)abstract class TestUser private String name; public abstract boolean isStupidName(String name) 2)public class CheckPasswordprivate void authentic

42、ate()private String s=""int 1= s.length()3)abstract class uploadFileprivate abstract String upload();4)public class ProcessDatapublic int addData(final int x)return +x;5)public class ProcessDatapublic int addData(final int x)return +x;public class ProcessDatapublic static void main(String

43、args) Other o=new Other(); new Something().addOne(o);public void addData(final Other o)o.i+;class Otherpublic int i；6)class TestClassint i；public void doSomething()System.out.print("i="+i);7)class TestClassfinal int i;public void doSomething()System.out.print("i="+i);8)public cla

44、ss Somethingpublic static void main(String args) something s=new Something();System.out.print("s.doSomething() return"+doSomething();public String doSomething()return "Do something."9)public class TestClasspublic void submit()String str = new String"china","usa&quo

45、t;System.out.print(str0);str2="england"System.out.print(str2);10)public class TestFilepublic void readFile()InputStream is = this.getClas().getResourceAaStream("/config/perties");int len =is.available();byte templates= new bytelen;is.read(templates);50. 下列代碼編譯運(yùn)行結(jié)果。class He

46、lloA public HelloA() System.out.println("HelloA");System.out.println("I'm A class");static System.out.println("static A");public class HelloB extends HelloA public HelloB() System.out.println("HelloB");System.out.println("I'm B class");static

47、 System.out.println("static B");public static void main(String args) new HelloB();51. 下列代碼編譯運(yùn)行后，哪個(gè)字段會(huì)被保存到文件中？ class Shape public String name;class Circle extends Shape implements Serializableprivate float radius;transientint color;public static String type = "Circle"52. 在執(zhí)行new Ch

48、ild("mike")的時(shí)候都有哪些構(gòu)造方法被順序調(diào)用？class People String name;public People() System.out.print(1); public People(String name) System.out.print(2); = name;class Child extends People People father;public Child(String name) System.out.print(3); = name;father = new People(name + "

49、;:F");public Child() System.out.print(4); 53. getCustomerInfo()方法如下，try中可以捕獲三種類(lèi)型的異常，如果在該方法運(yùn)行中產(chǎn)生了一個(gè)IOException，將會(huì)輸出什么結(jié)果?public void getCustomerInfo() try / do something that may cause an Exception catch (java.io.FileNotFoundException ex) System.out.print("FileNotFoundException!"); catch (java.io.IOException ex) System.out.print("IOException!"); catch (java.lang.Exception ex) System.out.print("Exception!"); 54. 下列代碼編譯運(yùn)行結(jié)果。String s1 ="0.5",s2="12