Java Package 类

class PackageInfo{
public static void main(String args[]){
 
Package p=Package.getPackage("java.lang");

System.out.println("package name: "+p.getName());

System.out.println("Specification Title: "+p.getSpecificationTitle());
System.out.println("Specification Vendor: "+p.getSpecificationVendor());
System.out.println("Specification Version: "+p.getSpecificationVersion());

System.out.println("Implementaion Title: "+p.getImplementationTitle());
System.out.println("Implementation Vendor: "+p.getImplementationVendor());
System.out.println("Implementation Version: "+p.getImplementationVersion());
System.out.println("Is sealed: "+p.isSealed());


 }
}