welcome to java

import java.util.*;
import java.lang.*;
import java.io.*;

public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println("hello world");   // to print on a screen
    System.out.print("************");
    System.out.println("print in same line ");
    // to take inputs from user
    Scanner sc = new Scanner(System.in); // here sc is a variable
    // data types
    int n = sc.nextInt();
    long m =sc.nextLong();
    char ch = '@';
    String s1 =sc.next(); //next encounters both space and enter
    String s2 =sc.nextLine();// nextLine encounters only enter for nextline
    float a =sc.nextFloat();
    double b =sc.nextDouble();
    boolean flag =sc.nextBoolean();
    short c= sc.nextShort();
    //how to concatinate the integers and strings
    int p = 400;
    int q =200;
    System.out.println("sum of two numbers is "+(a+b));
    System.out.println("this is concatination "+a+b);
	}
}