Java中从控制台输入自定义的变量数据！

import java.util.Scanner;

/*
* @author Phoebus
*/

public class Hello_World {

public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);

int var_int;
var_int = sc.nextInt();
System.out.println(var_int);

long var_long = sc.nextLong();
System.out.println(var_long);

double var_double = sc.nextDouble();
System.out.println(var_double);

String var_string = new String();
var_string = sc.next();
System.out.println(var_string);

}
}