在Java中使用示例打包 isSealed() 方法
Java.lang.Package 类的isSealed()方法用于检查这个包是否被密封。该方法将结果作为布尔值返回。
句法:
public boolean isSealed()
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() 方法。
示例 1:
Java
// 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());
}
}
Java
// 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());
}
}
输出:
Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
Is this package sealed or not: false
示例 2:
Java
// 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());
}
}
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–