67 lines
2.1 KiB
Java
67 lines
2.1 KiB
Java
/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrv@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr.algorithm.match;
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/**
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* 字符串匹配:暴力匹配
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*
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* @author ehlxr
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* @since 2022-03-12 13:36.
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*/
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public class BruteForce {
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public static void main(String[] args) {
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String s = "abdcfhjudfadf";
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String p = "dcf";
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System.out.println(bf(s, p));
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}
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public static int bf(String s, String p) {
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int m = s.length();
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int n = p.length();
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for (int i = 0; i <= m - n; i++) {
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int j = 0;
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for (; j < n; j++) {
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// if (s.charAt(i) == p.charAt(j)) {
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// i++;
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// } else {
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// break;
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// }
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// 如果主串与模式串不匹配,则主串向右移动一个字符,模式串从头开始匹配
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if (s.charAt(i + j) != p.charAt(j)) {
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break;
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}
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}
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if (j == n) {
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// return i - n;
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return i;
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}
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}
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return -1;
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}
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}
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