DifferenceModerate2 marks
What is the difference between the Scanner class functions next() and nextLine()?
Topic: next() and nextLine()
Previous-year question practice database
Answer
Exam answer
The difference is shown in the table.
Explanation
The difference is where each stops reading — at a space or at the end of the line. Say that plainly and give an example of when each is needed. Worth adding the practical trap: after nextInt() or next(), the newline character is left in the buffer, so the following nextLine() returns an empty string. The remedy is an extra sc.nextLine() to clear it. Examiners reward candidates who know this.
Comparison
| next() | nextLine() |
|---|---|
| Reads only up to the first whitespace, so it returns a single word. | Reads the entire line, spaces included, up to the newline character. |
| Useful for one-word input such as a code or a single name. | Necessary for input containing spaces, such as a full name or a sentence. |
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