Java getImplementationVersion() Method

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Description

The Java Package getImplementationVersion() method returns the version of this implementation. It consists of any string assigned by the version of this implementation and does not have any particular syntax specified or expected by the Java runtime. It may be compared for equality with other package version strings used for this implementation by this version for this package.

Declaration

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

public String getImplementationVersion()

Parameters

NA

Return Value

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

Exception

NA

Getting Implementation Version of java.lang Package Example

The following example shows the usage of java.lang.Package.getImplementationVersion() method. In this program, we've created a Package variable and assigned it java.lang package object. Then using getImplementationVersion() method, 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 version
      System.out.println(pack.getImplementationVersion());
   }
}

Output

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

null

Getting Implementation Version of Custom Package Example

The following example shows the usage of java.lang.Package.getImplementationVersion() method. In this program, we've created a Package variable and assigned it com.tutorialspoint package object. Then using getImplementationVersion() method, 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 version
      System.out.println(pack.getImplementationVersion());
   }
}

Output

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

null

Getting Implementation Version of java.util Package Example

The following example shows the usage of java.lang.Package.getImplementationVersion() method. In this program, we've created a Package variable and assigned it java.util package object. Then using getImplementationVersion() method, 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 version
      System.out.println(pack.getImplementationVersion());
   }
}

Output

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

null