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详细说明： 1. The name of a Java source file (a) has no restrictions (b) must be the same as the class it defines, ignoring case (c) must use the extension .class (d) must be the same as the class it defines, respecting case 2. Which of the following statements is (are) true about the use of an asterisk (*) in a Java import statement? Ⅰ.It does not incur run-time overhead. Ⅱ.It can be used to import multiple packages with a single statement. Ⅲ.It can be used to import multiple classes with a single statement (a) I, II, and III (b) I and III only (c) I only (d) III only ..... 9. According to the Java code conventions, files that contain Java source code have the suffix _____, and compiled bytecode files have the suffix _____. (a) .class, .java (b) .class, .javac (c) .java, .class (d) .javac, .class 10. As an aid in debugging a program in Java, print statements may be used to display which of the following types of information? I. The names of methods being called II. The values of the parameters of a method Ⅲ. The values of the instance variables of a class (a) I and II only (b) I and III only (c) II and III only (d) I, II, and III 1. In a UML class diagram's representation of a class, the top, middle, and lower rectangular compartments respectively describe the _____ of the class. (a) name, attributes, and methods (b) name, methods, and constants (c) attributes, methods, and name (d) attributes, methods, and constants 2. UML class diagrams can describe which of the following? I. The internal structure of classes Ⅱ. Relationships between classes (a) I and II (b) II only (c) None (d) I only ....... 1.The term class variable is a synonym for (a) a private data field (b) a static data field (c) a read-only variable (d) an instance variable 2. Consider the following Java program segment. import java.io.*; public class Test { public Test( ) { System.out.println("default"); } public Test( int i ) { System.out.println("non-default"); } public static void main(String[] args) { Test t = new Test(2); } } ......... 9. When a subclass defines an instance method with the same return type and signature as a method in its parent, the parent's method is said to be (a) private (b) hidden (c) overloaded (d) overridden 10. Which is a Java access modifier used to designate that a particular data field will not be inherited by a subclass? (a) final (b) protected (c) private (d) default 1. Consider the following Java program segment. String[] str = {"Three","Two","One"}; for (int i = 0; i < str.length; ++i) { System.out.println(str[i]+"/"); } What will be output upon execution of the program segment? (a) Three/Two/One/ (b) Three,Two,One (c) One,Two,Three (d) One/Two/Three/ 2. Consider the following Java program segment. int[] arr; arr = new int[3]; arr[2]=19; arr[1]=17; arr[0]=15; Which of the following Java statements is syntactically correct and semantically identical to the program segment? (a) int[] arr= {15, 17, 19}; (b) int[3] arr = {15, 17, 19}; (c) int arr = {15, 17, 19}; (d) int arr[3]= {15, 17, 19}; ........ 2. Which of the following statements is (are) true about any abstract method in Java? I. It contains no definition. Ⅱ. It cannot be declared public. (a) I and II (b) I only (c) None (d) II only 3. Consider the following Java program fragment. public void drive(Vehicle v) { ... } ... drive(obj); The method call drive(obj) is valid if obj is which of the following? I. A descendent of class Vehicle II. An ancestor of class Vehicle Ⅲ. An object of class Vehicle (a) I and III only (b) I, II, and III (c) III only (d) II and III only ..... ...展开收缩
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