Java™ Application Development on Linux - Dator

84Chapter 3An Experienced Programmer’s Introduction to Java$ export CLASSPATH="/home/joeuser"$Now Java knows where to look to find classes of thecom.myco.financial and com.myco.util packages.3.3.2 The import StatementOnce we have put our classes into packages, we have to use that package’s namewhen we refer to those classes—unless we use the import statement.Continuing our example, if we want to declare a reference to an Accountobject, but Account is now part of com.myco.financial, then we could referto it with its full name, as in:com.myco.financial.Account =new com.myco.financial.Account(user, number);which admittedly is a lot more cumbersome than just:Account = new Account(user, number);To avoid the unnecessarily long names, Java has import statements. Theyare put at the beginning of the class file, outside the class definition, just afterany package statement. In an import statement, you can name a class withits full name, to avoid having to use the full name all the time. So our examplebecomes:import com.myco.financial.Account;// ...Account = new Account(user, number);If you have several classes from that package that you want to reference,you can name them all with a “*”, and you can have multiple different importstatements, as in:import java.util.*;import com.myco.financial.*;// ...Account = new Account(user, number);Here are a few things to remember about import statements. First, theydon’t bring in any new code into the class. While their syntax and placement