默认题库 - OCJP(310-065)

单选题

Given： 12.Date date = new Date（）； 13.df.setLocale（Locale.ITALY）； 14.String s = df.format（date）； The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14， 2000？（）

A. The value of s is 14-dic-2000.
B. The value of s is Dec 14， 2000.
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 13.

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单选题

Given a method that must ensure that its parameter is not null： 11. public void someMethod（Object value） { 12. // check for null value ... 20. System.out.println（value.getClass（））； 21. } What inserted at line 12， is the appropriate way to handle a null value？（）

A. assert value == null；
B. assert value != null， "value is null"；
C. if （value == null） { throw new AssertionException（"value is null"）； }
D. if （value == null） { throw new IllegalArgumentException（"value is null"）； }

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多选题

A team of programmers is reviewing a proposed API for a new utility class. After some discussion， theyrealize that they can reduce the number of methods in the API without losing any functionality. If theyimplement the new design，which two OO principles will they be promoting？（）

A. Looser coupling
B. Tighter coupling
C. Lower cohesion
D. Higher cohesion
E. Weaker encapsulatio

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单选题

A company that makes Computer Assisted Design （CAD） software has， within its application， some utilityclasses that are used to perform 3D rendering tasks. The company’s chief scientist has just improved theperformance of one of the utility classes’ key rendering algorithms， and has assigned a programmer toreplace the old algorithm with the new algorithm. When the programmer begins researching the utilityclasses， she is happy to discover that the algorithm to be replaced exists in only one class. The programmer reviews that class’s API， and replaces the old algorithm with the new algorithm， being carefulthat her changes adhere strictly to the class’s API. Once testing has begun， the programmer discovers thatother classes that use the class she changed are no longer working properly. What design flaw is mostlikely the cause of these new bugs？（）

A. Inheritance
B. Tight coupling
C. Low cohesion
D. High cohesion
E. Loose coupling

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单选题

Given： String[] elements = { "for"， "tea"， "too" }； String first = （elements.length > 0）？ elements[0] ： null； What is the result？（）

A. Compilation fails.
B. An exception is thrown at runtime.
C. The variable first is set to null.
D. The variable first is set to elements[0].

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单选题

Which statement is true？（）

A class’s finalize（） method CANNOT be invoked explicitly.
B. super.finalize（） is called implicitly by any overriding finalize（） method.
C. The finalize（） method for a given object is called no more than once by the garbage collector.
D. The order in which finalize（） is called on two objects is based on the order in which the two objects became finalizable.

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单选题

Given： 11.double input = 314159.26； 12.NumberFormat nf = NumberFormat.getInstance（Locale.ITALIAN）； 13.String b； 14.//insert code here Which code， inserted at line 14， sets the value of b to 314.159，26？（）

A. b = nf.parse（ input ）；
B. b = nf.format（ input ）；
C. b = nf.equals（ input ）；
D. b = nf.parseObject（ input ）；

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单选题

Given： 12.String csv = "Sue，5，true，3"； 13.Scanner scanner = new Scanner（ csv ）； 14.scanner.useDelimiter（"，"）；15. int age = scanner.nextInt（）； What is the result？（）

A. Compilation fails.
B. After line 15， the value of age is 5.
C. After line 15， the value of age is 3.
D. An exception is thrown at runtime.

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单选题

Which can appropriately be thrown by a programmer using Java SE technology to create a desktop application？（）

A. ClassCastException
B. NullPointerException
C. NoClassDefFoundError
D. NumberFormatException
E. ArrayIndexOutOfBoundsExceptio

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单选题

Given： 11.String test = "Test A. Test B. Test C."； 12.// insert code here 13.String[] result = test.split（regex）； Which regular expression， inserted at line 12，correctly splits test into "Test A"，"Test B"，and "Test C"？（）

A. String regex = ""；
B. String regex = " "；
C. String regex = ".*"；
D. String regex = "\\s"；
E. String regex = "\\.\\s*"；

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Given： 12.Date date = new Date（）； 13.df.setLocale（Locale.ITALY）； 14.String s = df.format（date）； The variable df is an object of type DateFormat that has been initialized in line 11. What is the result if this code is run on December 14， 2000？（）

Given a method that must ensure that its parameter is not null： 11. public void someMethod（Object value） { 12. // check for null value ... 20. System.out.println（value.getClass（））； 21. } What inserted at line 12， is the appropriate way to handle a null value？（）

A team of programmers is reviewing a proposed API for a new utility class. After some discussion， theyrealize that they can reduce the number of methods in the API without losing any functionality. If theyimplement the new design，which two OO principles will they be promoting？（）

Given： String[] elements = { "for"， "tea"， "too" }； String first = （elements.length > 0） ？ elements[0] ： null； What is the result？（）

Which statement is true？（）

Given： 11.double input = 314159.26； 12.NumberFormat nf = NumberFormat.getInstance（Locale.ITALIAN）； 13.String b； 14.//insert code here Which code， inserted at line 14， sets the value of b to 314.159，26？（）

Given： 12.String csv = "Sue，5，true，3"； 13.Scanner scanner = new Scanner（ csv ）； 14.scanner.useDelimiter（"，"）；15. int age = scanner.nextInt（）； What is the result？（）

Which can appropriately be thrown by a programmer using Java SE technology to create a desktop application？（）

Given： 11.String test = "Test A. Test B. Test C."； 12.// insert code here 13.String[] result = test.split（regex）； Which regular expression， inserted at line 12，correctly splits test into "Test A"，"Test B"，and "Test C"？（）

Given： String[] elements = { "for"， "tea"， "too" }； String first = （elements.length > 0）？ elements[0] ： null； What is the result？（）