public class Test1 {
// * 统计大串中小串出现的次数
//   大串：haohaoxuexi,tiantianxiangshang
//   小串：an
public static void main(String[] args) {
  countTest1();
  String s1 = "haohaoxuexi,tiantianxiangshang"; //定义大串
  String s2 = "an";        //定义小串
  int count = 0;
  int index = 0;
  while ((index = s1.indexOf(s2)) != -1) {
   count++;
   s1 = s1.substring(index + s2.length());
  }
  System.out.println("count=:"+count);
}
private static void countTest1() {
String s1 = "haohaoxuexi,tiantianxiangshang"; //定义大串
String s2 = "an";        //定义小串
int count = 0;         //定义计数器
for (int i = 0; i < s1.length(); i++) {   //遍历大串
  if (s1.indexOf(s2) > 0) {
   count++;
   s1 = s1.substring(s1.indexOf(s2) + s2.length());
  }
}
System.out.println("count=:"+count);
}

}

public class Test1 {
// * 统计大串中小串出现的次数
//   大串：haohaoxuexi,tiantianxiangshang
//   小串：an
public static void main(String[] args) {
  countTest1();
  String s1 = "haohaoxuexi,tiantianxiangshang"; //定义大串
  String s2 = "an";        //定义小串
  int count = 0;
  int index = 0;
  while ((index = s1.indexOf(s2)) != -1) {
   count++;
   s1 = s1.substring(index + s2.length());
  }
  System.out.println("count=:"+count);
}
private static void countTest1() {
String s1 = "haohaoxuexi,tiantianxiangshang"; //定义大串
String s2 = "an";        //定义小串
int count = 0;         //定义计数器
for (int i = 0; i < s1.length(); i++) {   //遍历大串
  if (s1.indexOf(s2) > 0) {
   count++;
   s1 = s1.substring(s1.indexOf(s2) + s2.length());
  }
}
System.out.println("count=:"+count);
}

}