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Package isSealed(URL) method in Java with Examples
  • Last Updated : 05 Jun, 2021

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 parameter.
Return Value: This method returns the result as a boolean value.
Below programs demonstrate the isSealed(URL) method.
Example 1:
 

Java




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

 

Example 2:
 

Java




// 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));
    }
}
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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