String, enum

一、String

String string;
private final static int LEN_RANDOM = 3;
private final static String AP_PATTERN = "^A\\w{" + LEN_RANDOM + "}-\\S+";

return string == null? false : string.matches(PATTERN); 

String encodeName = Base64.encodeToString(mNickName.getBytes(HTTP.UTF_8), BASE64_FLAG);

 

 

 

二、enum

enum Color{
                RED(255,0,0),BLUE(0,0,255),BLACK(0,0,0),YELLOW(255,255,0),GREEN(0,255,0);
                //构造枚举值，比如RED(255,0,0)
                private Color(int rv,int gv,int bv){
                 this.redValue=rv;
                 this.greenValue=gv;
                 this.blueValue=bv;
                }

                public String toString(){  //覆盖了父类Enum的toString()
                return super.toString()+"("+redValue+","+greenValue+","+blueValue+")";
                }
   
                private int redValue;  //自定义数据域，private为了封装。
                private int greenValue;
                private int blueValue;
 }