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Here is the syntax for the switch statement: switch( <integral expression> ) { case value_one: <statement_one> case value_two: <statement_two> case value_three: <statement_three> . . . case value_n: <statement_n> default: <statement_default> } The integral expression must evaluate to an integer value. This usually means that the integral expression is an int or a char value. In particular, the expression cannot be a String (although that option would be nice to have sometimes). The statements can be compound statements, and in a switch from other syntax, compound statements within a switch case need not be framed in curly brackets. However, if you like curly brackets, the Java compiler will accept curly brackets around the compound statements. The default case is optional, but we believe a default case should always be included, if only to provide error checking. If your program expects the days of Christmas to vary between 1 and 12, it s good practice to put in a default statement which will let you know if the value of dayOfChristmas ever turns up as some value other than 1 through 12. Especially with more complex programs, such default code could save you many hours of debugging. Without the default statement, if none of the cases match the integral expression, the JVM simply skips over all the switch code. Having the default case will catch the anomalous condition and show you where the problem is. Here is a complete program to print the words to the 12 verses of The Twelve Days of Christmas. The program uses a while loop to iterate through the 12 verses. Then it uses an if-else statement to decide whether this is the first verse or one of the later verses; that is necessary because the line about a partridge in a pear tree has the word And in it for the 2nd through 12th verses, but not for the 1st verse. The \n at the end of the lines having to do with a partridge in a pear tree is an example of an escape sequence. An escape sequence begins with a backslash, and the following character has special meaning for the Java compiler. The \n means to insert a linefeed, so that there will be a blank line between verses. There are other escape sequences for tabbing and other functions, too. Finally, this program illustrates how to add comments to a program written in Java. Any typing that follows // on a line is treated as a comment; that is, the typing is ignored by the Java compiler. Also, any typing between the characters /* and */ is also a comment, and such comments can extend over multiple lines. If such a multiline comment begins with /**, it is a javadoc (Java documentation) comment, and will be included by the javadoc processor in the automatically generated documentation of the program. Javadoc comments can include special tags, such as @author, which the javadoc processor recognizes when it generates the HTML format of the documentation. We will not be describing the javadoc processor in any more detail in this chapter, but you can read about javadoc comments here: http://java.sun.com/j2se/javadoc/. In our opinion, the javadoc processor is one of the magnificent contributions Java has made to programming practice. The javadoc processor uses comments within the programs themselves to generate attractive and complete documentation of every class. Wonderful! As a matter of programming style, I like to put a comment following closing curly braces that tells me which block of code is being terminated. Particularly when many code blocks are nested within one another, such comments help me keep track of my curly brackets. This style is a personal preference, not a standard. Adopt it only if you wish.
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