Tutorial: Declaring Boolean Variables

Tutorial: Declaring Boolean Variables

Now let's write a Visual Basic project based on the snippet of code. In this tutorial, you will have a chance to declare three boolean variables and assign them different values.

Load the Developer Studio and close the project workspace you created. Then open a new text file and type the following code into the text Editor Window.

public static void main (String arv[] {
// Declare the boolean.
boolean myBol1;

// Declare and assign the value to false.
boolean myBool2 = false

// Declare and assign the value to true,
boolean myBool3 = true ;

//Assign the first to false
myBool = false;

//Print out values
System.out.printIn ("the value if my Bool1 is " + myBool1);
System.out.printIn ("the value if my Bool2 is " + myBool2);
System.out.printIn ("the value if my Bool3 is " + myBool3);

}
}

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Characters

The keyword char denotes the character data type. The char type is exactly like char in C/C++ with only the one major difference. The char type in Java stores its values using the 16 bit Unicode format.

The following is an example of a char. Notice that there are single quotation marks around the actual character. Then denotes that X is a character literal, which was described earlier.

char mychar = 'X';

Documentation Comments 2

Although the preceding program may be a little difficult to write, the documentation is easy. The documentation describes the purpose of the function and what the user needs to do to operate the program.

Visual J++ can then recover the notes into actual user documentation, in HTML/web page format when you compile your code. This HTML documentation can then be linked to your page, or can e invoked with Visual J++ by pressing the F1 key.

Documentation Comments

Java has introduced a special type of comment called a documentation or doc comment. These comments begin with /** and end with */. Documentation comments are used using the Visual J++ doc tool.

You can use documentation comments to comment th purpose and/or functionality of the current Java or program. The following is an example:

/**
Java Stuff is a program that does everything the user wants.
This program is consists of several components.

*/

Multiple Line Comments

You"ll often want to write a paragraph of comments and you won't want to mess with a // at the beginning of each line. To do this, Visual J++ allows multiple line comments (also callled the multiple-line comments) enclosed within /* and */, such as the following:

/*
Program Author: Chuck Wood
Program Title: JavaStuff.java
.
.
JP
*/

Single Line Comments

You use the double slash (//) to comment a single line or part of a line. Here are some examples of single line comments:

//This is a full line comments. No other logic is allowed on this line.

1 = a + p; // All living things (1) consist of animals (a) and plants(p)

As you can see, // was used to add a line of comments.