1108. Defanging an IP Address

Question

Given a valid (IPv4) IP address, return a defanged version of that IP address.

A defanged IP address replaces every period "." with "[.]".

Solution

迭代每个字符，用StringBuffer类来组成新的字符串。

Code

class Solution {
    public String defangIPaddr(String address) {
        StringBuffer sb = new StringBuffer();
        for(char c : address.toCharArray()){
            if(c == '.'){
                sb.append("[.]");
            }
            else{
                sb.append(c);
            }
        }
        return sb.toString();
    }
}