packagetest.java

Java面向对象编程(随书配套源代码) 阐述了面向对象编程的思想

package chapter8;

class PackageTest
{
    public static void main(String args[])
    {
        Package pkgs[] = Package.getPackages();
        for(int i=0; i < pkgs.length; i++)
            System.out.println(pkgs[i].getName() + " "
                 + pkgs[i].getImplementationTitle() + " "
                 + pkgs[i].getImplementationVendor() + " "
                 + pkgs[i].getImplementationVersion());
    }
}