Here you can find the source of firstInvalidOctet(CharSequence cs, BitSet bits)
static int firstInvalidOctet(CharSequence cs, BitSet bits)
//package com.java2s; /*/* w w w . ja v a2s . c om*/ * Copyright 2015 The Netty Project * * The Netty Project licenses this file to you under the Apache License, * version 2.0 (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ import java.util.BitSet; public class Main { static int firstInvalidOctet(CharSequence cs, BitSet bits) { for (int i = 0; i < cs.length(); i++) { char c = cs.charAt(i); if (!bits.get(c)) { return i; } } return -1; } }