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Boolean Literals
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Boolean literals are the source code representation for boolean values. A boolean value can only be defined as true or false. Although in C (and some other languages) it is common to use numbers to represent true or false, this will not work in Java. Again, repeat after me, Java is not C++.
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boolean t = true; // Legal boolean f = 0; // Compiler error!
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Be on the lookout for questions that use numbers where booleans are required. You might see an if test that uses a number, as in the following:
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int x = 1; if (x) { } // Compiler error!
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A char literal is represented by a single character in single quotes.
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char a = 'a'; char b = '@';
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You can also type in the Unicode value of the character, using the Unicode notation of prefixing the value with \u as follows:
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char letterN = '\u004E'; // The letter 'N'
Remember, characters are just 16-bit unsigned integers under the hood. That means you can assign a number literal, assuming it will fit into the unsigned 16-bit range (65535 or less). For example, the following are all legal:
char char char char a b c d = = = = 0x892; // octal literal 982; // int literal (char) 70000; // The cast is required; 70000 is out of char range (char) -98; // Ridiculous, but legal
And the following are not legal and produce compiler errors:
char e = -29; // Possible loss of precision; needs a cast char f = 70000 // Possible loss of precision; needs a cast
1: Language Fundamentals
You can also use an escape code if you want to represent a character that can t be typed in as a literal, including the characters for linefeed, newline, horizontal tab, backspace, and double and single quotes.
char c = '\"'; // A double quote char d = '\n'; // A newline
Now that you re familiar with the primitive data types and their ranges, you should be able to identify the proper data type to use in a given situation. Next are some examples of real-life quantities. Try to pick the primitive type that best represents the quantity.
Literal Values for Strings
A string literal is a source code representation of a value of a String object. For example, the following is an example of two ways to represent a string literal:
String s = "Bill Joy"; System.out.println("Bill" + " Joy");
SCENARIO & SOLUTION
Which primitive type would be best to represent the number of stars in the universe Which primitive type would be best to represent a single multiple choice question on a test, with only one answer allowed Which primitive type would be best to represent a single multiple choice question on a test, with more than one answer allowed Which primitive type would be best to represent the population of the U.S. in 2003 Which primitive type would be best to represent the amount of money (in dollars and cents) you plan on having at retirement long char
char []
int (or long for the world population) float (or double if you are a CEO of a software company)
Array Declaration, Construction, and Initialization (Exam Objective 1.1)
Although strings are not primitives, they re included in this section because they can be represented as literals in other words, typed directly into code. The only other nonprimitive type that has a literal representation is an array, which we ll look at in the next section.
Thread t = // what literal value could possibly go here
CERTIFICATION OBJECTIVE
Array Declaration, Construction, and Initialization (Exam Objective 1.1)
Write code that declares, constructs, and initializes arrays of any base type using any of the permitted forms both for declaration and for initialization. Arrays are objects in Java that store multiple variables of the same type. Arrays can hold either primitives or object references, but the array itself will always be an object on the heap, even if the array is declared to hold primitive elements. In other words, there is no such thing as a primitive array, but you can make an array of primitives. For this objective, you need to know three things:
How to make an array reference variable (declare) How to make an array object (construct) How to populate the array with elements (initialize)
There are several different ways to do each of those, and you need to know about all of them for the exam.
Arrays are efficient, but most of the time you ll want to use one of the Collection types from java.util (including HashMap, ArrayList, TreeSet). Collection classes offer more flexible ways to access an object (for insertion, deletion, reading, etc.) and unlike arrays, can expand or contract dynamically as you add or remove elements (they re really managed arrays, since they use arrays behind the scenes). There s a Collection type for a wide range of needs. Do you need a fast sort A group of objects with no duplicates A way to access a name/value pair A linked list 6 covers them in more detail.
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