Chapter 4 Notes

Style: We will use singular identifiers for all collections: student, not students; file, not files; etc.

Generic classes:

• require a type parameter when used in a declaration
• object references declared with one type cannot be assigned objects declared with a different type

Numbering of collections:

• the index can be thought of as an offset from the beginning
• ArrayLists, unlike arrays, can remove elements; this causes the indexes of the remaining elements to change

for-each loop:

• cannot add or remove elements of the the collection within the loop body
• do not make available an index value for each iteration; the index value is internal to the loop’s control
• number of iterations equals the number of collection elements
• a definite iteration: the number of executions of the loop body is known in advance

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