public static void main(String[] args) throws Exception { String word = "abcdefg"; System.out.println(word.length()); System.out.println(word.replace("a", "").length()); int a_counter = word.length() - word.replace("a", "").length(); System.out.println(a_counter); }
String str = "helloslkhellodjladfjhello"; String findStr = "hello"; int lastIndex = 0; int count = 0; while(lastIndex != -1){ lastIndex = str.indexOf(findStr,lastIndex); if(lastIndex != -1){ count ++; lastIndex += findStr.length(); } } System.out.println(count);