用示例打包 Java 中的隐藏(网址)方法

原文:https://www . geesforgeks . org/package-issaledurl-method-in-Java-with-examples/

java.lang.Package 类 的 isSealed(URL) 方法用于针对指定的 URL 检查该包裹是否密封。方法以布尔值的形式返回结果。 语法:

public boolean isSealed(URL url)

参数:此方法不接受任何参数。 返回值:该方法将结果作为布尔值返回。 下面的程序演示了 isSealed(网址)方法。 例 1:

Java 语言(一种计算机语言，尤用于创建网站)

// 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("https://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

例 2:

Java 语言(一种计算机语言，尤用于创建网站)

// 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

参考:T2【https://docs . Oracle . com/javase/9/docs/API/Java/lang/package . html # isSealed–T4】

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