import java.io.*;
import java.util.*;
​
public class template {
    public static void main(String[] args) throws IOException {
        // Input:
        // 12 243.92
        // 100000000000000
        // Hello!
        Scanner r = new Scanner(System.in); // Creating a Scanner object
        int a = r.nextInt(); // Reading in an int
        double b = r.nextDouble(); // Reading in a double
        long c = r.nextLong(); // Reading in a long
​
        // .nextInt(), .nextDouble(), and .nextLong() do not advance the reader to the next line
        // and .nextLine() reads the current line
        // This line of code serves the purpose of advancing the reader to the next line
        r.nextLine();
​
        String d = r.nextLine(); // Reading in a line
    }
}

Scanner Example