java.lang.Package类的isSealed(URL)方法用于检查此程序包是否相对于指定的URL是密封的。该方法以布尔值返回结果。
用法:
public boolean isSealed(URL url)
参数:此方法不接受任何参数。
返回值:此方法将结果作为布尔值返回。
下面的程序演示了isSealed(URL)方法。
范例1:
// 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("http://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));
}
}
输出:
Package represented by myPackage:package java.lang, Java Platform API Specification, version 1.8 Is this package sealed or not:false
范例2:
// 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));
}
}
输出:
Package represented by myPackage:package java.io, Java Platform API Specification, version 1.8 Is this package sealed or not:false
参考: https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#isSealed-
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注:本文由纯净天空筛选整理自guptayashgupta53大神的英文原创作品 Package isSealed(URL) method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。