Ragged arrays are useful data structures because of their memory-saving capability. For example, consider a spreadsheet with the potential for 100,000 rows by 20,000 columns.

Java supports arrays. Each element occupies the same number of bytes, and the exact number depends on the type of the element’s data item. Furthermore, all elements share the same type.

Example: Data structure: Storing the test results for a class of students: An array could be used, as there are a fixed number of students and each student’s score can be accessed by its ...