Package isSealed(URL) method in Java with Examples

The isSealed(URL) method of java.lang.Package class is used to check if this package is sealed or not, with respect to the specified URL. The method returns the result as a boolean value.

Syntax:

public boolean isSealed(URL url)

Parameter: This method does not accept any paramter.

Return Value: This method returns the result as a boolean value.

Below programs demonstrate the isSealed(URL) method.



Example 1:

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// Java program to demonstrate
// isSealed(URL) method
  
import java.net.*;
  
public class Test {
    public static void main(String[] args)
        throws MalformedURLException
    {
  
        // returns the Package
        // object for this package
        Package myPackage
            = Package.getPackage("java.lang");
  
        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());
  
        URL url
            = new URL("http://www.geeksforgeeks.org");
  
        // check if this package is sealed or not
        // using isSealed(URL) method
        System.out.println(
            "Is this package sealed or not: "
            + myPackage.isSealed(url));
    }
}

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Output:

Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
Is this package sealed or not: false

Example 2:

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// Java program to demonstrate
// isSealed(URL) method
  
import java.net.*;
  
public class Test {
    public static void main(String[] args)
        throws MalformedURLException
    {
  
        // returns the Package
        // object for this package
        Package myPackage
            = Package.getPackage("java.io");
  
        System.out.println(
            "Package represented by myPackage: "
            + myPackage.toString());
  
        URL url
            = new URL("http://www.gfg.org");
  
        // check if this package is sealed or not
        // using isSealed(URL) method
        System.out.println(
            "Is this package sealed or not: "
            + myPackage.isSealed(url));
    }
}

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Output:

Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8
Is this package sealed or not: false

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

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