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28 Cards in this Set
- Front
- Back
Comments should |
be insightful and explain what the instruction's intention is |
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A color image is broken down into individual pixels(points), each of which is represented by |
3 values denoting the intensity of red, green, and blue in the image |
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In order to be accessible over a computer network, the computer needs its on |
network address |
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The instruction: System.out.println("Hello World"); might be best commented as |
//used to demonstrate an output message |
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A URL (Universal Resource Locator) specifies the address of |
a document or other type of file on the internet |
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For a computer to communicate over the the internet, it must use |
the combined TCP/IP protocol |
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6 bits can be used to represent ________distinct items or values |
64 |
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A Java program is best classified as: |
software |
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Java is an example of |
both high-level language and fourth generation language |
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Consider the following enumeration enum Speed {FAST, MEDIUM, SLOW} ; |
The name of the speed enumeration whose ordinal value is zero is FAST |
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If two variables contain aliases of the same object then |
the object cannot be modified unless there's but a singe reference to it |
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Consider the following two lines of code. What can you say about s1 and s2? String s1 = "testing" + "123"; String s2 = new String ("testing 123"); |
s1 and s2 are both references to different string objects |
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In Java, "instantiation" means |
creating a new object of the class |
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In addition to their usage providing a mechanism to convert (to box) primitive data into objects, what else does the wrapper classes provide? |
static constants |
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An "alias" is when |
two different reference variables refer to the same physical object |
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An API is |
an Application Programming Interface |
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In Java a variable may contain |
a value or a reference |
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Java.text's NumberFormat class includes methods that |
allow you to format currency, allow you to format percentages, round their display during the formatting process, but not truncate their display during the formatting process |
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Say you write a program that makes use of the Random class, but you fail to include an import statement for java.util.Random (or java.util.*). What will happen when you attempt to compile and run your program. |
The program won't compile-you'll receive a syntax error about the missing class. |
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Instance data for a Java class |
may be primitive types or objects |
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An example of passing message to a String where the message has a String parameter would occur in which of the following messages |
equals |
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To define a class that would represent a car. which of the following definitions is most appropriate |
public class Car |
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A class constructor usually defines |
how an object is initialized |
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A variable whose scope is restricted to the method where it was declares is known as a |
local variable |
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The behavior of a object is defined by the object's |
methods |
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If a method does not not have a return statement, then |
it must be a void method |
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Consider a Rational class designed to represent rational numbers as a pair of int's, along with methods reduce (to reduce the rational to simplest form), gcd (to find the greatest common divisor of two int's), as well as methods for addition, subtraction, multiplication, and division. Why should the reduce and gcd methods be declared to be private. |
Because they will be only be called from methods inside of Rational |
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What happens if you declare a class constructor to have a void return type? |
You'll likely receive a syntax error |