java 操作注册表

import java.util.prefs.*;  
public class Registery {  
    String[] keys = {"oa"};  
    String[] values = {"reg"};  
 //把相应的值储存到变量中去  
    public void writeValue() {  
 // HKEY_LOCAL_MACHINE\Software\JavaSoft\prefs下写入注册表值.  
        Preferences pre = Preferences.systemRoot().node("/javaplayer");  
        for (int i = 0; i < keys.length; i++) {  
            pre.put(keys[i], values[i]);  
        }  
    }    
 //读取变量
    public String  readValue() {  
 // HKEY_LOCAL_MACHINE\Software\JavaSoft\prefs下读取注册表值.  
        Preferences pre = Preferences.systemRoot().node("/javaplayer"); 
        return pre.get("oa", "def");
    } 
    public static void main(String[] args) {  
        Registery reg = new Registery();  
        reg.writeValue(); 
        System.out.println(reg.readValue());
    }  
}