java字符串下划线转驼峰工具使用

public class StringUtil {
	private static final char UNDERLINE='_'; 
    /**
     * 下划线 转 驼峰
     * @param param
     * @return
     */
    public static String underlineToCamel(String param){ 
        if (param==null||"".equals(param.trim())){  
            return "";  
        }  
        int len=param.length();  
        StringBuilder sb=new StringBuilder(len);  
        for (int i = 0; i < len; i++) {  
            char c = Character.toLowerCase(param.charAt(i));  
            if (c == UNDERLINE){  
               if (++i<len){  
                   sb.append(Character.toUpperCase(param.charAt(i)));  
               }  
            }else{  
                sb.append(c);  
            }  
        }  
        return sb.toString();  
    } 
}