java代码

public class StringOccurrences {
    public static void main(String[] args) {
        String str1 = "这是一个字符串要测试字符串出现的次数";
        String str2 = "字符串";
        int count = 0;
        int index = str1.indexOf(str2);
        while(index!=-1){
            count++;
            index = str1.indexOf(str2,index+str2.length());
        }
        System.out.println(count);
    }
}

python代码

#coding:utf-8
# 计算一个字符串在另一个字符串中出现次数
def stringoccurrences():
    str1 = "这是一个字符串要测试字符串出现的次数"
    str2 = "字符串"
    count = 0
    index = str1.find(str2)
    while(index!=-1):
        count+=1
        index = str1.find(str2,index+1)
    print(count)

if __name__ == '__main__':
    stringoccurrences()