问题:单选题Click the Exhibit button. Given: ClassA a = new ClassA(); a.methodA(); What is the result?()AThe code runs with no output.BCompilation fails.CAn exception is thrown at runtime.DClassC is displayed.
Sunday, March 17, 2024
问题:单选题Click the Exhibit button. Given this code from Class B: 25. A a1 = new A(); 26. A a2 = new A(); 27. A a3 = new A(); 28. System.out.println(A.getInstanceCount()); What is the result?()ACompilation of class A fails.BLine 28 prints the value 3 to System.out.CLine 28 prints the value 1 to System.out.DCompilation fails because of an error on line 28.EA runtime error occurs when line 25 executes.
Monday, January 15, 2024
问题:单选题Given: What is the result of calling search with a valid List implementation? ()A0BThe result is undefined.CaD2E1FcGb
Wednesday, March 27, 2024
问题:多选题Which two code fragments correctly create and initialize a static array of int elements?()AABBCCDD
问题:单选题Given: 11. String test = "This is a test"; 12. String[] tokens = test.split("/s"); 13. System.out.println(tokens.length); What is the result?()AAn exception is thrown at runtime.B1C4DCompilation fails.E0
问题:单选题Given: 12. System.out.format("Pi is approximately %d.", Math.PI); What is the result?()AAn exception is thrown at runtime.BPi is approximately 3.CPi is approximately 3.141593.DCompilation fails.
问题:单选题Given: What is the result?()AAn exception is thrown at runtime.Br, e, o,CCompilation fails.Dr, t, t,
问题:多选题Given: 11. // insert code here 12. private N min, max; 13. public N getMin() { return min; } 14. public N getMax() { return max; } 15. public void add(N added) { 16. if (min == null || added.doubleValue() max.doubleValue()) 19. max = added; 20. } 21. } Which two, inserted at line 11, will allow the code to compile?()AABBCCDDEEFF
问题:单选题Given: Which code, inserted at line 15, creates an instance of the Point class defined in Line?()ALine l = new Line() ; l.Point p = new l.Point();BLine.Point p = new Line.Point();CThe Point class cannot be instatiated at line 15.DPoint p = new Point();
问题:单选题Given: What is the result?()AABBCCDDEE
问题:单选题Given: 11. public void genNumbers() { 12. ArrayList numbers = new ArrayList(); 13. for (int i=0; i<10; i++) { 14. int value = i * ((int) Math.random()); 15. Integer intObj = new Integer(value); 16. numbers.add(intObj); 17. } 18. System.out.println(numbers); 19. } Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbage collection?()ALine 19BThe object is NOT a candidate for garbage collection.CLine 17DLine 16ELine 18
问题:单选题Given the command line java Pass2 and: What is the result? ()AdoStuff x = 6 main x = 6BCompilation fails.CdoStuff x = 6 main x = 7DAn exception is thrown at runtime.EdoStuff x = 7 main x = 6FdoStuff x = 7 main x = 7
问题:多选题Given: 10. interface Jumper { public void jump(); } ... 20. class Animal {} ... 30. class Dog extends Animal { 31. Tail tail; 32. } ... 40. class Beagle extends Dog implements Jumper{ 41. public void jump() {} 42. } ... 50. class Cat implements Jumper{ 51. public void jump() {} 52. }. Which three are true?()ACat is-a JumperBCat is-a AnimalCDog is-a JumperDDog is-a AnimalEBeagle has-a JumperFCat has-a AnimalGBeagle has-a Tail
问题:多选题Given: 10. class One { 11. void foo() { } 12. } 13. class Two extends One { 14. //insert method here 15. } Which three methods, inserted individually at line 14, will correctly complete class Two?()Apublic void foo() { /* more code here */ }Bprivate void foo() { /* more code here */ }Cprotected void foo() { /* more code here */ }Dint foo() { /* more code here */ }Evoid foo() { /* more code here */ }
问题:单选题Given: 11. static class A { 12. void process() throws Exception { throw new Exception(); } 13. } 14. static class B extends A { 15. void process() { System.out.println("B "); } 16. } 17. public static void main(String[] args) { 18. A a = new B(); 19. a.process(); 20. } What is the result? ()ACompilation fails because of an error in line 19.BAn exception is thrown at runtime.CBDCompilation fails because of an error in line 18.ECompilation fails because of an error in line 15. FThe code runs with no output.
问题:单选题Given: What is the result?()AIf you define D e = new E(), then e.bMethod() invokes the version of bMethod() defined in Line 5.BIf you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 5.CCompilation fails because of an error in line 9.DIf you define D e = (D)(new E()), then e.bMethod() invokes the version of bMethod() defined in Line 9.ECompilation fails because of an error in line 3.FCompilation fails because of an error in line 7.