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 methodpublic 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

Package Version: 1.5.0

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java jar包示例