public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
String a = sc.next();
//int a = nextInt();
//boolean a = nextLine();
System.out.print(a);
}
注: Scanner 以空格为分界线决定是不是一行
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
String a = sc.next();
//int a = nextInt();
//boolean a = nextLine();
System.out.print(a);
}