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The Iterator interface provides methods like hasNext() and next() to traverse a collection.

Optional is used to represent a value that may or may not be present, reducing null pointer risks.

The clear() method removes all elements from a collection, leaving it empty.

Char values are added as ASCII values: 97 + 98 + 99 = 294, since no string is involved initially.

The default clause executes when no case matches the switch expression.

The valueOf() method (e.g., Integer.valueOf()) converts a primitive to a wrapper object.

Math.pow() raises a number to a power, so 2^3 = 8.0 (returned as a double).

The Scanner class, initialized with System.in, is used to read input from the console.

Continue skips the rest of the current loop iteration and moves to the next one.

The toUpperCase() method converts all characters in a string to uppercase.

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