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
Wednesday, March 27, 2024
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:多选题Which two code fragments correctly create and initialize a static array of int elements?()AABBCCDD
问题:单选题Given: What is the result? ()AA new Item object is created with the preferred value in the id attribute.BThe attribute id in the Item object is modified to the new value.CCompilation fails.DAn exception is thrown at runtime.EThe attribute id in the Item object remains unchanged.
Sunday, March 17, 2024
问题:单选题Given: 11. public static void main(String[] args) { 12. Object obj = new int[] { 1, 2, 3 }; 13. int[] someArray = (int[])obj; 14. for (int i : someArray) System.out.print(i + " "); 15. } What is the result? ()ACompilation fails because of an error in line 13.BA ClassCastException is thrown at runtime.C1 2 3DCompilation fails because of an error in line 14.ECompilation fails because of an error in line 12.
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: 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:多选题Given: 12. NumberFormat nf = NumberFormat.getInstance(); 13. nf.setMaximumFractionDigits(4); 14. nf.setMinimumFractionDigits(2); 15. String a = nf.format(3.1415926); 16. String b = nf.format(2); Which two statements are true about the result if the default locale is Locale.US?()AThe value of b is 2.00.BThe value of a is 3.141.CThe value of a is 3.14.DThe value of b is 2.0000.EThe value of a is 3.1415.FThe value of a is 3.1416.GThe value of b is 2.
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:多选题A JavaBeans component has the following field: 11. private boolean enabled; Which two pairs of method declarations follow the JavaBeans standard for accessing this field?()AABBCCDD
问题:单选题Given: What is the result?()AAn exception is thrown at runtime.Br, e, o,CCompilation fails.Dr, t, t,
Tuesday, January 16, 2024