write coding using java.

(b) Consider the following statements. String sentence; sentence = "Life is like a roller coaster"; (i) Write a String method to return the number of characters in the sentence. [1 mark] (ii) What is the length of sentence? [1 mark] (iii) Write a String method to return the index of "coaster"? [2 marks] (iv) What is the index of "coaster"? [1 mark] Write a String method to return "roller coaster" from the sentence. [2 marks] (vi) Write a String method to return "Life is like a roller coaster ride.". [2 marks] (vii) Write a String method to return the string with all characters in upper-case. [1 mark]