Package getSpecificationVersion() method in Java with Examples

The getSpecificationVersion() method of java.lang.Package class is used to get the version of the specification of this package. The method returns the specification version of the package as a String.
Syntax:

public String getSpecificationVersion()

Parameter: This method does not accept any parameter.
Return Value: This method returns the specification version of the package as a String, if known. Else it returns null
Below programs demonstrate the getSpecificationVersion() method.
Example 1:

Java

// Java program to demonstrate
// getSpecificationVersion() method

public class Test {
    public static void main(String[] args)
    {

        // returns the Package object
        // for this package
        Package myPackage
            = Package.getPackage("java.lang");

        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());

        // Get the specification version of myPackage
        // using getSpecificationVersion() method
        System.out.println(
            "Specification version of myPackage: "
            + myPackage.getSpecificationVersion());
    }
}

Output:

Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
Specification version of myPackage: 1.8

Example 2:

Java

// Java program to demonstrate
// getSpecificationVersion() method

public class Test {
    public static void main(String[] args)
    {

        // returns the Package object
        // for this package
        Package myPackage
            = Package.getPackage("java.io");

        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());

        // Get the name of myPackage
        // using getSpecificationVersion() method
        System.out.println(
            "Specification version of myPackage: "
            + myPackage.getSpecificationVersion());
    }
}

Output:

Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8
Specification version of myPackage: 1.8

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#getSpecificationVersion–