Java getSpecificationVersion() Method

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Description

The Java Package getSpecificationVersion() method returns the version number of the specification that this package implements. This version string must be a sequence of positive decimal integers separated by "."'s and may have leading zeros. When version strings are compared the most significant numbers are compared.

Declaration

Following is the declaration for java.lang.Package.getSpecificationVersion() method

public String getSpecificationVersion()

Parameters

NA

Return Value

This method returns the specification version, null is returned if it is not known.

Exception

NA

Getting Specification Version of java.lang Package Example

The following example shows the usage of java.lang.Package.getSpecificationVersion() method. In this program, we've created a Package variable and assigned it java.lang package object. Then using getSpecificationVersion() method, specification version of the package is printed.

package com.tutorialspoint;

public class PackageDemo {

   public static void main(String[] args) {

      // get the java package
      Package pack = Package.getPackage("java.lang");

      // print the package specification version
      System.out.println(pack.getSpecificationVersion());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

null

Getting Specification Version of Custom Package Example

The following example shows the usage of java.lang.Package.getSpecificationVersion() method. In this program, we've created a Package variable and assigned it com.tutorialspoint package object. Then using getSpecificationVersion() method, specification version of the package is printed.

package com.tutorialspoint;

public class PackageDemo {

   public static void main(String[] args) {

      // get the java package
      Package pack = Package.getPackage("com.tutorialspoint");

      // print the package specification version
      System.out.println(pack.getSpecificationVersion());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

null

Getting Specification Version of java.util Package Example

The following example shows the usage of java.lang.Package.getSpecificationVersion() method. In this program, we've created a Package variable and assigned it java.util package object. Then using getSpecificationVersion() method, specification version of the package is printed.

package com.tutorialspoint;

public class PackageDemo {

   public static void main(String[] args) {

      // get the java package
      Package pack = Package.getPackage("java.util");

      // print the package specification version
      System.out.println(pack.getSpecificationVersion());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

null