NEED ANSWER IN JAVA ASAP. I AM USING NETBEANS

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Answer Following Questions: 1. Which method in which class can be used to check if a character is upper case letter or not? 2. Give a string str="a string at following location", what will be the return from following method calls? a. str.indexOf("ing"); b. str.lastIndexOf("ing"); C. str.substring(3,7); 3. What is the difference between the replace method in String class and StringBuilder class? 4. In split method's argument, when do you use []? 5. What is wrong with the following code and how can we fix it? ArrayList score = new ArrayList()