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) methodimport 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 // 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) methodimport 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 // 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–
