User input telephone number, judge reasonable or not? requirements, judging length and judging whether the input content is reasonable hide the middle 4 digits of the user's phone number

/** * User Input phone number, judge whether reasonable or not? Ask, judge the length and judge the input is reasonable * Hide the user phone number in the middle of 4, * ideas: * *. With regular judgment conditions: Length 11-bit judgment there are two methods, regular {11} and Length () ==11. Input content with regular judgment * telephone number of the regular: "() [0-9][\\d]{8}| (15) [0-9] [\\d] {8} "*/

 Public class StringDemo4 {    publicstaticvoid  main (string[] args) {        = " 15942081304 ";         = "() [0-9][\\d]{8}| (15) [0-9] [\\d] {8} ";        System.out.println (Inttelnum.matches (Telregex));         = inttelnum.substring (3,7);        System.out.println (covernum);         = Inttelnum.replace (Covernum, "* * * *");        System.out.println (Inttelnum);    }}

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User input telephone number, judge reasonable or not? requirements, judging length and judging whether the input content is reasonable hide the middle 4 digits of the user's phone number