The isSealed() method of java.lang.Package class is used to check if this package is sealed or not. The method returns the result as a boolean value.
Syntax:
public boolean isSealed()
Parameter: This method does not accept any parameter.
Return Value: This method returns the result as a boolean value.
Below programs demonstrate the isSealed() method.
Example 1:
Java
// Java program to demonstrate// isSealed() methodpublic 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()); // check if this package is sealed or not // using isSealed() method System.out.println( "Is this package sealed or not: " + myPackage.isSealed()); }} |
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() methodpublic 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()); // check if this package is sealed or not // using isSealed() method System.out.println( "Is this package sealed or not: " + myPackage.isSealed()); }} |
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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