《程序员代码面试指南》第五章 字符串问题 替换字符串中连续出现的指定字符串

题目

替换字符串中连续出现的指定字符串

java代码

package com.lizhouwei.chapter5;

/**
 * @Description: 替换字符串中连续出现的指定字符串
 * @Author: lizhouwei
 * @CreateDate: 2018/4/23 22:39
 * @Modify by:
 * @ModifyDate:
 */
public class Chapter5_6 {

    public String replace(String str, String from, String to) {
        char[] chars = str.toCharArray();
        char[] charf = from.toCharArray();
        int mi = 0;
        int si = 0;
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] == charf[mi++]) {
                if (mi == charf.length) {
                    si = i;
                    while (mi-- != 0) {
                        chars[si--] = '0';
                    }
                    mi = 0;
                }
            } else {
                mi = 0;
            }
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < chars.length; i++) {
            if (chars[i] != '0') {
                sb.append(chars[i]);
            }
            if (chars[i] == '0' && (i == 0 || chars[i - 1] != '0')) {
                sb.append(to);
            }
        }
        return sb.toString();
    }

    //测试
    public static void main(String[] args) {
        Chapter5_6 chapter = new Chapter5_6();
        String str1 = "123abcabc";
        String str2 = "abc";
        String str3 = "4567";
        System.out.println("将123abcabc中abc替换为4567：" + chapter.replace(str1, str2, str3));
    }
}

结果