Oracle认证考试1Z0-853单项选择题每日一练(2019.01.17)

单项选择题
Given：What is the result？（）
A. An exception is thrown at runtime.
B. int Long
C. Compilation fails.
D. Short Long
单项选择题
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？（）
A. Compilation fails because of an error in line 13.
B. A ClassCastException is thrown at runtime.
C. 1 2 3
D. Compilation fails because of an error in line 14.
E. Compilation fails because of an error in line 12.
单项选择题
Given： 11. String test = "This is a test"； 12. String[] tokens = test.split（"\s"）； 13. System.out.println（tokens.length）； What is the result？（）
A. An exception is thrown at runtime.
B. 1
C. 4
D. Compilation fails.
E. 0
单项选择题
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？（）
A. Compilation of class A fails.
B. Line 28 prints the value 3 to System.out.
C. Line 28 prints the value 1 to System.out.
D. Compilation fails because of an error on line 28.
E. A runtime error occurs when line 25 executes.
单项选择题
Given：Which statement is true？（）
A. The cardID and limit variables break polymorphism.
B. The code demonstrates polymorphism.
C. The ownerName variable breaks encapsulation.
D. The setCardInformation method breaks encapsulation.
E. The class is fully encapsulated.