a) Write a method encrypt(String text, int key) that returns a String. This method does two things to the string text: 1. First, it reverses the order of its words (“hello there” becomes “there hello”). 2. The second thing is incrementing the characters’ ascii code by key. For example, if the key is equal to 2, “hello” becomes “jgnnq” (since ‘h’ + 2 = ‘j’ and so on). Note that this second step does not apply to the space character so a space remains a space. For example, "Humming birds" for a key equal to 4 becomes: "fmvhw Lyqqmrk". b) Write a test program that prompts the user to enter a line of text and a key then calls the method encrypt to display the encryption of the input text.

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The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.