中国联通-Java开发与实践培训结业考试2018.3.21

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以下题型为不定项选择题

35. String #name = Jane Doe;36. int $age=24;37. Double _height = 123.5;38. double ~temp = 37.5;Which two are true? (Choose two.)

42. public class ClassA {43. public int getValue() {44. int value=0;45. boolean setting = true;46. String title=Hello;47. if (value || (setting title== Hello)) { return 1; }48. if (value == 1 title.equals(Hello)) { return 2; }49. }50. }And:70. ClassA a = new ClassA();71. a.getValue();What is the result?

public class Test { publicstatic void main(String [] args) { intx =5; booleanb1 = true; booleanb2 = false; if((x==4) !b2) System.out.print(l); System.out.print(2); if((b2 = true) b1) System.out.print(3);}}What is the result?

10.int x=0;11.int y=10;12. do {13. y--;14. ++x;15. } while (x 5);16. System.out.print(x + , +y);What is the result?

11. public static void main(String[] args){12. for (int i=0;i= 10;i++){13. if( i6) break;14. }15. System.out.println(i);16. }Whatis the result?

10. public class Bar {11.static void foo(int...x) {12. // insert code here13. }14. }Whichtwo code fragments, inserted independently at line 12, will allow the class tocompile? (Choose two.)

public void go(){ Stringo = ; z: for(intx=0; x3; x++){ for(int y=0; y2; y++){ if(x== 1) break; if(x==2 y==1) break z; o= o + x + y; } } System.out.println(o);}Whatis the result when the go() method is invoked?

Which two code fragments correctly createand initialize a static arrayof int elements? (Choose two.)

1. public class GC {2. private Object o;3. private void doSomethingElse(Object obj){ o = obj; }4. public void doSomething() {5. Object o = new Object();6. doSomethingElse(o);7. o = new Object();8. doSomethingElse(null);9. o=null;10. }11. }When the doSomething method is called,after which line does theObjectcreated in line 5 become available for garbage collection?

1. package com.company.application;2.3. public class MainClass {4. public static void main(String[] args) {} }And MainClass exists in the/apps/com/company/application directory.Assume the CLASSPATH environment variableis set to “.“ (current directory). Which two javacommands entered at thecommand linewillrun MainClass? (Choose two.)

A developer is creating a class Book thatneeds to access class Paper.The Paper class is deployed in a JAR namedmyLib.jar. Which three,taken independently, will allow thedeveloper to use the Paper classwhile compiling the Book class? (Choosethree.)

Given the command line java Pass2 and:15. public class Pass2 {16. public void main(String [] args) {17. int x=6;18. Pass2 p = new Pass2();19. p.doStuff(x);20. System.out.print(” main x = “+ x);21. }22.23. void doStuff(int x) {24. System.out.print(” doStuffx = “+ x++);25. }26. }Whatis the result?

10. class Foo {11. private int x;12. public Foo(int x) {this.x=x; }13. public void setX( int x) { this.x = x;}14. public int getX() { return x; }15. }16.17. public class Gamma {18.19. static Foo fooBar( Foo foo) {20. foo = new Foo( 100);21. return foo;22. }23.24. public static void main( String[] args){25. Foo foo = new Foo( 300);26. System.out.print( foo.getX() + “-“);27.28. Foo fooFoo = fooBar( foo);29. System.out.print( foo.getX() + “-“);30. System.out.print( fooFoo.getX() + “-“);31.32. foo = fooBar( fooFoo);33. System.out.print( foo.getX() + “-“);34. System.out.prmt( fooFoo.getX());35. }36. }Whatis the output of this program?

11. static void test() throws Error {12. if (true) throw new AssertionError();13. System.out.print(”test “);14. }15. public static void main(String[] args){16. try { test(); }17. catch (Exception ex) { System.out.print(”exception “); }18. System.out.print(”end “);19. } What is the result?

10.class MakeFile {11.public static void main(String[] args) {12.try {13.File directory = new File(”d”);14.File file = new File(directory,”f”);15.if(!file.exists()) {16.file.createNewFile();17.}18.} catch (IOException e) {19. e.printStackTrace();20.}21.}22. }The current directory does NOT contain adirectory named “d.” Which three are true? (Choose three.)