CLASSPATH environmental variable. Third, you can use the -classpath option with java
and javac to specify the path to your classes.
For example, consider the following package specification:
package MyPack
In order for a program to find MyPack, one of three things must be true. Either the program
can be executed from a directory immediately above MyPack, or the CLASSPATH must be
set to include the path to MyPack, or the -classpath option must specify the path to MyPack
when the program is run via java.
When the second two options are used, the class path must not include MyPack, itself.
It must simply specify the path to MyPack. For example, in a Windows environment, if the
path to MyPack is
C:\MyPrograms\Java\MyPack
Then the class path to MyPack is
C:\MyPrograms\Java
The easiest way to try the examples shown in this topic is to simply create the package
directories below your current development directory, put the .class files into the
appropriate directories, and then execute the programs from the development directory.
This is the approach used in the following example.
A Short Package Example
Keeping the preceding discussion in mind, you can try this simple package:
// A simple package
package MyPack;
class Balance {
String name;
double bal;
Balance(String n, double b) {
name = n;
bal = b;
}
void show() {
if(bal<0)
System.out.print("--> ");
System.out.println(name + ": $" + bal);
}
}
class AccountBalance {
public static void main(String args[]) {
Balance current[] = new Balance[3];
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