字符串匹配练习

package com.java;

import org.junit.Test;

/**
 * @author txd
 * @create 2019-12-23-21:45
 */
public class LianXi2 {
    public static int getCount(String mainStr, String subStr) {
        int mainLength = mainStr.length();
        int subLength = subStr.length();
        int count = 0;
        int index = 0;
        if (mainLength >= subLength) {
            //方式一
//            while ((index = mainStr.indexOf(subStr)) != -1) {
//                count++;
//                mainStr = mainStr.substring(index + subStr.length());
//            }
            //方式二
            while ((index = mainStr.indexOf(subStr, index)) != -1) {
                count++;
                index += subLength;

            }
            return count;
        } else {
            return 0;
        }
    }
}