用示例将 isSealed()方法打包到 Java 中
原文:https://www . geesforgeks . org/package-issealed-method-in-Java-with-examples/
java.lang.Package 类 的 isSealed() 方法用于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()
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()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() 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());
}
}
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() 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());
}
}
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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