String为空判断

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        //比较 方法一，大多数人都这么比较  
 
    String param = config.getInitParameter("log-level");  
    if (param != null && !"".equals(param)) {  
        final Level level = Log.getLevel(param);  
        if (level != null) Log.lookup("org.zkoss").setLevel(level);  
        else log.error("Unknown log-level: "+param);  
    }  
            //比较 方法二，（而我研究的源码基本都这么比较）  
             String param = config.getInitParameter("log-level");  
    if (param != null && param.length() > 0) {  
        final Level level = Log.getLevel(param);  
        if (level != null) Log.lookup("org.zkoss").setLevel(level);  
        else log.error("Unknown log-level: "+param);  
    }