public class Test11 
{

 private static int counter = 0;
 /**
  * @param args
  */
 public static void main(String[] args) 
 {
  String str ="sdSS**&HGJhadHCASch& ^^";
  int i = stringNumbers(str);
  System.out.println(i);
 }
 
 public static int stringNumbers(String str)
 {
  if (str.indexOf("java")==-1)
  {
   return 0;
  }
  else if(str.indexOf("java") != -1)
  {
   counter++;
   stringNumbers(str.substring(str.indexOf("java")+4));
   return counter;
  }
  return 0;
 }
} 

if(str.indexOf("java") != -1)
 {
  String[] str1 = str.split("java");
  System.out.println(str1.length-1);
 }
 else 
 {
  System.out.println(0);
 }