一个简单的递归——逆序输出字符串

public static String getStr(String source){    
        if(source==null||source.equals("")){
            return "";
        }
        if(source.length()==1){
            return source;
        }else{
            String temp = source.substring(0, source.length()-1);
            String value = source.substring(source.length()-1, source.length());
            return value + getStr(temp);
        }
        
    }