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:

public boolean isSealed()

Parameter: This method does not accept any paramter.

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

Below programs demonstrate the isSealed() method.



Example 1:

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// Java program to demonstrate
// isSealed() method
  
public 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());
    }
}

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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() method
  
public 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());
    }
}

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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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