用 Java 打包 getSpecificationVersion()方法，示例
原文:https://www . geesforgeks . org/package-getspecificationversion-method-in-Java-with-examples/
java.lang.Package 类 的getspecification version()方法用于获取该包的规范版本。方法以字符串形式返回包的规范版本。
语法:
public String getSpecificationVersion()
参数:此方法不接受任何参数。
返回值:该方法将包的规格版本作为字符串返回，如果已知的话。否则返回空值
下面的程序演示了 getSpecificationVersion()方法。
例 1:
// Java program to demonstrate
// getSpecificationVersion() 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());
// Get the specification version of myPackage
// using getSpecificationVersion() method
System.out.println(
"Specification version of myPackage: "
+ myPackage.getSpecificationVersion());
}
}
输出:
Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
Specification version of myPackage: 1.8
例 2:
// Java program to demonstrate
// getSpecificationVersion() 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());
// Get the name of myPackage
// using getSpecificationVersion() method
System.out.println(
"Specification version of myPackage: "
+ myPackage.getSpecificationVersion());
}
}
输出:
Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8
Specification version of myPackage: 1.8
参考:https://docs . Oracle . com/javase/9/docs/API/Java/lang/package . html # getspecification version–
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