我需要写一个仅包含0到9之间的数字的字符串

Question

So i have this project where i need to write a mutator method that changes a person's phone number only if the phone number contains numbers from 0 to 9 and no letters or any other things. The type of the phone number is string and i tried using conditional statements. If the mobile contains anything other than numbers then nothing should happen. this is what i got so far:

public void setMobile(String mobile) {
if(mobile.matches("[a-zA-z]+")){
 }
 else{      
        this.mobile = mobile;
 }

}

thanks

Answer 1

您的正则表达式模式应为[0-9]+

Answer 2

If you are looking for anything that isn't a number then the pattern is \\D . That just means non-digit and is a shorthand for [^0-9]

See http://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html