String字符串以,为分割转成list数组

String value = "a,b,c,d,e";

Arrays.asList(value.split(","));

 

 

 

Object---->String:Object is not null; 否则NullPointerException.

String------>Object:必是可转String,否则classCaseException.

String.valueOff(object) ---------->  先判空object是否为null.

 

 

 

前台css样式中:!implement      -------->高优先级.

IE6认识,但不认识优先级.