java jar包示例

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

• getImplementationTitle() method is available in java.lang package.

  getImplementationTitle()方法在java.lang包中可用。

• getImplementationTitle() method is used to retrieve the implementation title of the package and we know that every package has some specialization and implementation title.

  使用getImplementationTitle()方法检索包的实现标题，并且我们知道每个包都有一些专门化和实现标题。

• getImplementationTitle() 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.

  getImplementationTitle()方法是一种非静态方法，仅可通过类对象访问，如果尝试使用类名访问该方法，则会收到错误消息。

• getImplementationTitle() method does not throw an exception at the time of returning the title of the package.

  返回包的标题时， getImplementationTitle()方法不会引发异常。

Syntax:

句法：

public String getImplementationTitle();

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 the following values based on the given cases,

此方法的返回类型为String ，它根据给定的情况返回以下值：

• It returns the title of the package when exists.

  如果存在，它将返回包的标题。

• It returns null, when no title of the package exists.

  当包的标题不存在时，它返回null。

Example:

例：

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

Output

输出量

Package Title: Java Runtime Environment

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java jar包示例