1108. Defanging an IP Address

解法一

class Solution {
    public String defangIPaddr(String address) {
    	String ans = "";
    	for(int i = 0 ; i < address.length();i++){
            if(address.charAt(i)=='.') {
            	ans += "[.]";
            }
            else ans+= address.charAt(i);
        }
        return ans;
    }
}

解法二

class Solution {
	public String defangIPaddr(String address) {
		String result = "";
		int acount = 0;
		for (int i = 0; i < address.length(); i++) {
			if (address.charAt(i) == '.') {
				result += address.substring(acount, i);
				result += "[.]";
				acount = i + 1;
			}
		}
		return result + address.substring(acount, address.length());

	}
}