java中：统计字符串大串中小串出现的次数，代码实现

public class StringInquiry {
    public static void main(String[] args) {
        String maxString = "woaijavawozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijava";
        String minString = "java";
        int count = getConut(maxString, minString);
        System.out.println("java在大串中出现了：" + count + "次");
    }

    public static int getConut(String maxString, String minString) {
        int count = 0;
        //先在大串中查一下小串的位置
        int index = maxString.indexOf(minString); //4
        while (index != -1) {
            count++;
            int startIndex = index + minString.length();  //4+4
            maxString = maxString.substring(startIndex);  //wozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijavagun
            index = maxString.indexOf(minString);  //8
        }
        return count;
    }
}

代码优化后： 

public class StringInquiry {
    public static void main(String[] args) {
        String maxString = "woaijavawozhenaijavawozhendeaijavawozhendehenaijavaxinbuxinwoaijava";
        String minString = "java";
        int count = getConut(maxString, minString);
        System.out.println("java在大串中出现了：" + count + "次");
    }

    public static int getConut(String maxString, String minString) {
        int count = 0;
        while (maxString.contains(minString)) {
            count++;
            maxString = maxString.substring(maxString.indexOf(minString) + minString.length());
        }
        return count;
    }
}