1. Give a string str=a string at following location, what will be the return from following method calls?
   1. str.indexOf(ing);
   2. str.lastIndexOf(ing);
   3. str.substring(3,7);
2. What is the difference between the replace method in String class and StringBuilder class?
3. In split methods argument, when do you use []?
4. What is wrong with the following code and how can we fix it?

ArrayList score = new ArrayList();

NEED ANSWER IN JAVA