java jar包示例_Java包getImplementationVersion（）方法和示例

java jar包示例

包类的getImplementationVersion()方法 (Package Class getImplementationVersion() method)

getImplementationVersion() method is available in java.lang package.
getImplementationVersion()方法在java.lang包中可用。
getImplementationVersion() method is used to retrieve the versions of the package that provides an implementation of the package.
getImplementationVersion()方法用于检索提供程序包实现的程序包版本。
getImplementationVersion() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
getImplementationVersion()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。
getImplementationVersion() method does not throw an exception at the time of returning version of the package.
返回包的版本时， getImplementationVersion()方法不会引发异常。

Syntax:

句法：

    public String getImplementationVersion();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

Return value:

返回值：

The return type of this method is String, it returns an implementation version of the package.

该方法的返回类型为String ，它返回包的实现版本。

Example:

例：

// Java program to demonstrate the example 
// of String getImplementationVersion()
// of Package method
public class GetImplementationVersion {
public static void main(String[] args) {
// Get Package by using getPackage() method
Package pkg = Package.getPackage("java.util");
// Get implementation version of the package by using 
// getImplementationVersion() and stored in a variable
// called iversion
String iversion = pkg.getImplementationVersion();
// Display version of the package
System.out.print("Package Version: ");
System.out.print(iversion);
}
}

Output

输出量