杭州天丽科技有限公司-JAVA高级程序员.doc

杭州天丽科技有限公司 JAVA高级程序员选择题 1: 1. Whatwillbetheresultofexecutingthefollowingcode? 2. booleana=true; 3. booleanb=false; 4. booleanc=true; 5. if(a=true) 6. if(b=true) 7. if(c=true)System.out.println(Somethingsaretrueinthisworld); 8. elseSystem.out.println(Nothingistrueinthisworld!); 9. elseif(a&(b=c)System.out.println(Itstooconfusingtotellwhatistrueandwhatisfalse); 10. elseSystem.out.println(Heythiswontcompile); 11. 12. 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 2: Which of the following statements are true? A.The automatic garbage collection of the JVM prevents programs from ever running out of memory B.A program can suggest that garbage collection be performed and force it C.Garbage collection is platform independent D.An object becomes eligible for garbage collection when all references denoting it are set to null. 3: 1. Whatwillhappenwhenyouattempttocompileandrunthefollowingcode? 2. 3. classBase 4. 5. 6. 7. inti=99; 8. 9. publicvoidamethod() 10. 11. 12. 13. System.out.println(Base.amethod(); 14. 15. 16. 17. Base() 18. 19. 20. 21. amethod(); 22. 23. 24. 25. 26. 27. publicclassDerivedextendsBase 28. 29. 30. 31. inti=-1; 32. 33. 34. 35. publicstaticvoidmain(Stringargv) 36. 37. 38. 39. Baseb=newDerived(); 40. 41. System.out.println(b.i); 42. 43. b.amethod(); 44. 45. 46. 47. publicvoidamethod() 48. 49. 50. 51. System.out.println(Derived.amethod(); 52. 53. 54. 55. 56. 57. Choices:What will happen when you attempt to compile and run the following code? class Base int i = 99; public void amethod() System.out.println(Base.amethod(); Base() amethod(); public class Derived extends Baseint i = -1; public static void main(String argv) Base b = new Derived(); System.out.println(b.i); b.amethod(); public void amethod() System.out.println(Derived.amethod(); Choices:A.Derived.amethod() -1 Derived.amethod() B.Derived.amethod() 99 C.Compile time error D.Derived.amethod() 4:A class design requires that a member variable should be accessible only by same package, which modifer word should be used? A.protected B.public C.no modifer D.private 5: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 6: 1. Whatresultsfromattemptingtocompileandrunthefollowingcode? 2. 3. publicclassTernary 4. 5. 6. 7. publicstaticvoidmain(Stringargs) 8. 9. 10. 11. inta=5; 12. 13. System.out.println(Valueis-+(a5)?9.9:9); 14. 15. 16. 17. 18. 19. 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 4) 3. System.out.println(“Test1”); 4. elseif(x9) 5. System.out.println(“Test2”); 6. else 7. System.out.println(“Test3”); 8. Whichrangeofvaluexwouldproduceofoutput“Test2”?Give the code fragment:if(x4)System.out.println(“Test 1”);else if (x9)System.out.println(“Test 2”);else System.out.println(“Test 3”);Which range of value x would produce of output “Test 2”? A.x4 C.x9 D.None 11:Use the operator “” and “”. Which statement is true? A.1010 0000 0000 0000 0000 0000 0000 0000 4 give 0000 1010 0000 0000 0000 0000 0000 0000 B.1010 0000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 0000 0000 0000 0000 0000 C.1010 0000 0000 0000 0000 0000 0000 0000 4 give 0000 0000 0000 0000 0000 0000 0000 0000 D.1010 0000 0000 0000 0000 0000 0000 0000 4 give 1111 1010 0000 0000 0000 0000 0000 0000 12:使用 JDBC 可以做到的是 A.把二进制代码传送到任何关系数据库中 B.把 Java 源代码传送到任何关系数据库中 C.把表单信息传送到任何关系数据库中 D.很容易地把 SQL 语句传送到任何关系数据库中 13:Math.round(-11.5)等於多少? A.-11 B.-12 C.-11.5 D.none 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 简答题 15:找到一个子字符串，优化速度，优化空间。 16:什么是接口？为什么要定义接口？接口与抽象类有何异同？ 17:下面的代码在绝大部分时间内都运行得很正常，请问在什么情况下会出现问题？问题的根源在哪里？ import java.util.LinkedList; public class Stack LinkedList list = new LinkedList(); public synchronized void push(Object x) synchronized(list) list.addLast( x ); notify(); public synchronized Object pop() throws Exception synchronized(list) if( list.size() = 0 ) wait(); return list.removeLast(); 18:Java的接口和C+的虚类的相同和不同处。 19:hibernate中load()/get()区别。 20:How do