How to determine how many specified characters a string contains in java

You can use the indexOf(String s,int i) method in the String class. In this method, s is a string div, and i is searched starting from the i subscript. The position of this string in the calling string, the return value is of type int.

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Examples are as follows:

//创建方法ciShu，返回int计算s2在字符串s1中出现的次数；
public static int ciShu(String s1,String s2){
//定义一个int变量，用来计算s2在s1中出现的次数；
int he = 0;
//遍历s1
for(int i = 0;i<s1.length();i++){
//调用方法indexOf,计算s2在s1字符串中出现的下标，
int t = s1.indexOf(s2,i);
//当用if判断，当遍历开始下标i与s2在s1中出现的下标位置相等时变量he自增1；
if(i==t){
he++;
}
//返回he的值就是s2在s1中出现的次数；
return he;
}

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