Java Package getImplementationVersion()用法及代碼示例

java.lang.Package類的getImplementationVersion()方法用於獲取此包的實現版本。該方法以String形式返回包的實現版本。

用法:

public String getImplementationVersion()

參數：此方法不接受任何參數。

返回值：如果已知，此方法以String形式返回包的實現版本。否則返回null

下麵的程序演示了getImplementationVersion()方法。

示例1:

// Java program to demonstrate 
// getImplementationVersion() 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 implementation version of myPackage 
        // using getImplementationVersion() method 
        System.out.println( 
            "Implementation version of myPackage: "
            + myPackage.getImplementationVersion()); 
    } 
}

輸出：

Package represented by myPackage: package java.lang, Java Platform API Specification, version 1.8
Implementation version of myPackage: 1.8.0_181

示例2:

// Java program to demonstrate 
// getImplementationVersion() 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 getImplementationVersion() method 
        System.out.println( 
            "Implementation version of myPackage: "
            + myPackage.getImplementationVersion()); 
    } 
}

輸出：

Package represented by myPackage: package java.io, Java Platform API Specification, version 1.8
Implementation version of myPackage: 1.8.0_181

參考： https://docs.oracle.com/javase/9/docs/api/java/lang/Package.html#getImplementationVersion–

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