java.util · java.base · since Java 1.5

Scanner

declaration

public final class Scanner implements Iterator<String>, Closeable

Tokenizing text parser over any source: nextInt/nextLine/hasNext, regex-delimited. The standard beginner input tool with one famous newline gotcha.

Key methods

`boolean hasNextInt() / int nextInt()`	Typed token pairs — test then read.
`String nextLine()`	Rest of the current line.
`Scanner useDelimiter(String pattern)`	Custom token boundaries.