另外，我建议使用多态性进行以下实现：

这样，您可以通过减少类之间的耦合来更轻松地添加新平台。

客户端代码：

 Desktop desktop = Desktop.getDesktop();

 desktop.open( aFile );
 desktop.imaginaryAction( aFile );

桌面展示：

package your.pack.name;

import java.io.File;

public class Desktop{

    // hide the constructor.
    Desktop(){}

    // Created the appropriate instance
    public static Desktop getDesktop(){

        String os = System.getProperty("os.name").toLowerCase();

        Desktop desktop = new Desktop();
         // This uf/elseif/else code is used only once: here
        if ( os.indexOf("windows") != -1 || os.indexOf("nt") != -1){

            desktop = new WindowsDesktop();

        } else if ( os.equals("windows 95") || os.equals("windows 98") ){

            desktop = new Windows9xDesktop();

        } else if ( os.indexOf("mac") != -1 ) {

            desktop = new OSXDesktop();

        } else if ( os.indexOf("linux") != -1 && isGnome() ) {

            desktop = new GnomeDesktop();

        } else if ( os.indexOf("linux") != -1 && isKde() ) {

            desktop = new KdeDesktop();

        } else {
            throw new UnsupportedOperationException(String.format("The platform %s is not supported ",os) );
        }
        return desktop;
    }

    // default implementation :( 
    public void open( File file ){
        throw new UnsupportedOperationException();
    }

    // default implementation :( 
    public void imaginaryAction( File file  ){
        throw new UnsupportedOperationException();
    }
}

// One subclass per platform below:
// Each one knows how to handle its own platform


class GnomeDesktop extends Desktop{

    public void open( File file ){
        // Runtime.getRuntime().exec: execute gnome-open <file>
    }

    public void imaginaryAction( File file ){
        // Runtime.getRuntime().exec:gnome-something-else <file>
    }

}
class KdeDesktop extends Desktop{

    public void open( File file ){
        // Runtime.getRuntime().exec: kfmclient exec <file>
    }

    public void imaginaryAction( File file ){
        // Runtime.getRuntime().exec: kfm-imaginary.sh  <file>
    }
}
class OSXDesktop extends Desktop{

    public void open( File file ){
        // Runtime.getRuntime().exec: open <file>
    }

    public void imaginaryAction( File file ){
        // Runtime.getRuntime().exec: wow!! <file>
    }
}
class WindowsDesktop extends Desktop{

    public void open( File file ){
        // Runtime.getRuntime().exec: cmd /c start <file>
    }

    public void imaginaryAction( File file ){
        // Runtime.getRuntime().exec: ipconfig /relese /c/d/e
    }
}
class Windows9xDesktop extends Desktop{

    public void open( File file ){
        //Runtime.getRuntime().exec: command.com /C start <file>
    }

    public void imaginaryAction( File file){
       //Runtime.getRuntime().exec: command.com /C otherCommandHere <file>
    }
}

这只是一个例子，在现实生活中不值得仅通过参数化值（命令字符串％s）来创建一个新类，但是让我们想象一下每种方法都以平台特定的方式执行另一个步骤。

采取这种方法，可能会删除不必要的if / elseif /
else结构，这些结构会随着时间的推移而引入错误（如果代码中有6个错误，并且需要更改，您可能会忘记更新其中之一，或者通过复制/粘贴，您可能会忘记更改要执行的命令）