Package isSealed() method in Java with Examples
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:Â
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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:
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Java
// Java program to demonstrate// isSealed() methodÂ
public class Test {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        // returns the Package        // object for this package        Package myPackage            = Package.getPackage("java.lang");Â
        System.out.println(            "Package represented by myPackage: "            + myPackage.toString());Â
        // check if this package is sealed or not        // using isSealed() method        System.out.println(            "Is this package sealed or not: "            + myPackage.isSealed());    }} |
Output:Â
Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8 Is this package sealed or not: false
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Example 2:
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Java
// Java program to demonstrate// isSealed() methodÂ
public class Test {Â Â Â Â public static void main(String[] args)Â Â Â Â {Â
        // returns the Package        // object for this package        Package myPackage            = Package.getPackage("java.io");Â
        System.out.println(            "Package represented by myPackage: "            + myPackage.toString());Â
        // check if this package is sealed or not        // using isSealed() method        System.out.println(            "Is this package sealed or not: "            + myPackage.isSealed());    }} |
Output:Â
Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8 Is this package sealed or not: false
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Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#isSealed–
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