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);          }}