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25 Cards in this Set
- Front
- Back
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Superclass methods with this level of access cannot be called from subclasses.
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private
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Which of the following is not true of ExecutorService?
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It is an object that can be run in a separate thread
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Which of the following statements is false?
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Information in the memory unit is persistent—it is retained when the computer's power is turned off.
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Which of the following statements is true?
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Compilers translate high-level language programs into machine language programs.
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Collections method sort that accepts a List as an argument sorts the elements of a List, which must implement the __________ interface.
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Comparable
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Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.
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takeArray( items )
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In this question, assume a class, Book, has been defined. Which set of statements creates an array of Book objects?
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Book[] books;books = new Book[ numberElements ];
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Attempting to access an array element out of the bounds of an array, causes a(n)
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ArrayIndexOutOfBoundsException
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When should a program explicitly use the this reference?
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Accessing a field that is shadowed by a local variable.
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Failure to prefix the superclass method name with the keyword super and a dot (.) separator when referencing the superclass’s method causes ________.
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infinite recursion
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Which of the following segments is a proper way to call the method readData four times?
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int i = 0;while ( i < 4 ) { readData(); i = i + 1;} // end while
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Every Java application is composed of at least one
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public class declaration
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Having a this reference allows:
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All of the above.
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When the compiler translates a generic method into Java bytecodes, it uses __________ to replace the type parameters with actual types
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erasure
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Which of the following is a valid fully qualified name?
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java.util.Scanner
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________ is a graphical language that allows people who design software systems to use an industry stan¬dard notation to represent them.
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The Unified Modeling Language
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Using the protected keyword gives a member:
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package access
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An uncaught exception:
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is an exception that occurs for which there are no matching catch clauses.
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Arrays are:
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fixed-length entities.
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A(n) ________ enables a program to read data from the user.
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Scanner
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What do the following statements do?
double[] array; array = new double[14]; |
Create a double array containing 14 elements.
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When a __________ method or block is running on an object, the object is locked so no other such method can run on that object at the same time.
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synchronized
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What is the default value of a reference?
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null
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Which keyword is used to specify that a class will define the methods of an interface?
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implements
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__________ enable programmers to specify, with a single method declaration, a set of related methods.
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generic methods
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