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int num; // this declares a variable called num
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This line declares an integer variable called num Java (like most other languages) requires that variables be declared before they are used Following is the general form of a variable declaration: type var-name; Here, type specifies the type of variable being declared, and var-name is the name of the variable If you want to declare more than one variable of the specified type, you may use a commaseparated list of variable names Java defines several data types, including integer, character, and floating-point The keyword int specifies an integer type In the program, the line
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num = 100; // this assigns num the value 100
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assigns to num the value 100 In Java, the assignment operator is a single equal sign The next line of code outputs the value of num preceded by the string This is num:
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Systemoutprintln("This is num: " + num);
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In this statement, the plus sign causes the value of num to be appended to the string that precedes it, and then the resulting string is output (Actually, num is first converted from an integer into its string equivalent and then concatenated with the string that precedes it This
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Part I:
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The Java Language
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process is described in detail later in this book) This approach can be generalized Using the + operator, you can join together as many items as you want within a single println( ) statement The next line of code assigns num the value of num times 2 Like most other languages, Java uses the * operator to indicate multiplication After this line executes, num will contain the value 200 Here are the next two lines in the program:
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Systemoutprint("The value of num * 2 is "); Systemoutprintln(num);
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Several new things are occurring here First, the built-in method print( ) is used to display the string The value of num * 2 is This string is not followed by a newline This means that when the next output is generated, it will start on the same line The print( ) method is just like println( ), except that it does not output a newline character after each call Now look at the call to println( ) Notice that num is used by itself Both print( ) and println( ) can be used to output values of any of Java s built-in types
Two Control Statements
Although 5 will look closely at control statements, two are briefly introduced here so that they can be used in example programs in s 3 and 4 They will also help illustrate an important aspect of Java: blocks of code
The if Statement
The Java if statement works much like the IF statement in any other language Further, it is syntactically identical to the if statements in C, C++, and C# Its simplest form is shown here: if(condition) statement; Here, condition is a Boolean expression If condition is true, then the statement is executed If condition is false, then the statement is bypassed Here is an example:
if(num < 100) Systemoutprintln("num is less than 100");
In this case, if num contains a value that is less than 100, the conditional expression is true, and println( ) will execute If num contains a value greater than or equal to 100, then the println( ) method is bypassed As you will see in 4, Java defines a full complement of relational operators which may be used in a conditional expression Here are a few:
Operator < > == Meaning Less than Greater than Equal to
Notice that the test for equality is the double equal sign
2:
An Overview of Java
Here is a program that illustrates the if statement:
/* Demonstrate the if Call this file "IfSamplejava" */ class IfSample { public static void main(String args[]) { int x, y; x = 10; y = 20; if(x < y) Systemoutprintln("x is less than y"); x = x * 2; if(x == y) Systemoutprintln("x now equal to y"); x = x * 2; if(x > y) Systemoutprintln("x now greater than y");
// this won't display anything if(x == y) Systemoutprintln("you won't see this"); } }
The output generated by this program is shown here: x is less than y x now equal to y x now greater than y Notice one other thing in this program The line
int x, y;
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