What is Scanner class?

Scanner is a class in java.util package used for obtaining the input of the primitive types like int, double etc. and strings. It is the easiest way to read input in a Java program, though not very efficient if you want an input method for scenarios where time is a constraint like in competitive programming.

A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace.

A scanning operation may block waiting for input.

A Scanner is not safe for multithreaded use without external synchronization.

java.util.Scanner class declaration

public final class Scanner extends Object implements Iterator

ScannerTesting.java

import java.util.Scanner;

public class ScannerTesting {
	public static void main(String[] args) {
		Scanner scanner = new Scanner("hello 1 2.00 false");
		scanner.useDelimiter(" ");
		String str = scanner.next();
		int anInt = scanner.nextInt();
		float aFloat = scanner.nextFloat();
		boolean booleanValue = scanner.nextBoolean();
		System.out.println(str + ":" + anInt + ":" + aFloat + ":" + booleanValue);
	}
}

Output : hello:1:2.0:false