What is the key difference between next() and nextLine() methods?

• A. next() reads a complete line
• B. nextLine() does not read whitespace
• C. next() reads the next token without spaces
• D. nextLine() reads all tokens without stopping

Answer: (C)

The key difference between the next() and nextLine() methods lies in how they operate with input. The next() method reads the next token from the input, meaning it captures just a single word or a continuous string of characters separated by whitespace. Essentially, it stops reading at the first whitespace it encounters (like spaces, tabs, or line breaks), which makes it suitable for obtaining specific inputs where you only need one discrete piece of data at a time.

In contrast, nextLine() reads the entire line of input, including all characters until the line break is detected (when the Enter key is pressed). This means that nextLine() is capable of capturing everything from the current position in the input until it hits the end of that line, making it useful when you want to retrieve a full sentence or paragraph of data, including any whitespace.

The understanding of these methods is crucial for managing user input effectively in Java programs, especially when considering scenarios where spaces and line breaks matter in determining what data is captured.