Create a new Java file in Eclipse. Perform the following operations: Create a new StringBuilder from the String "Prepare for your knowledge". Check the capacity of the StringBuilder if it's empty. Find the index of the letter 'y'. Delete a substring from the starting index till this index (of ‘y’). Insert a string "Good luck on " at the beginning of the StringBuilder. Append '!' to it. Print your StringBuilder to Console. Attach the screenshot of code and output.

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Array

The simplest way to start thinking about an array is as a collection, or a set of elements. In programming, these elements may be constants, variables, functions and pointers.