public class dddd{ public static void main(String args[]) { String str = "sjjjssjjsjs"; int number = 0; char arr[] = str.toCharArray(); for (int i = 0; i < arr.length; i++) { if (arr[i] == 's') { number++; } if (number == 5) { System.out.print("第五次出现s的位置是:" + (i+1)); } } } }
String string="a12a34a56a78a9";char s='a';int lookindex(String string,char s){int count=0;for(int i=0;i<string.length();i++){ if(s==string[i])
{
count++; if(count==5) return i;}}}
{
count++; if(count==5) return i;//返回所寻找的字符第五次出现的索引}}return -1;//代表要寻找的字符没有出现五次}
public static void main(String args[]) {
String str = "sjjjssjjsjs";
int number = 0;
char arr[] = str.toCharArray();
for (int i = 0; i < arr.length; i++) { if (arr[i] == 's') {
number++;
}
if (number == 5) {
System.out.print("第五次出现s的位置是:" + (i+1));
}
}
}
}