Java 如何在firstName和lastName之间放置空格

我不知道为什么我的姓和名之间没有空格。请帮忙

import java.util.Scanner;

public class LastNameFirstNameChapter3
{
    public static void main(String[] args)
    {
    Scanner stdIn = new Scanner(System.in);
    String firstName; // Users First Name
    String lastName;  // Users Last Name
    String age;          // Users Age

    System.out.print("Enter Your First Name: ");
    firstName = stdIn.nextLine(); 
    System.out.println("Hello " +""+ firstName + "!");
    System.out.print("Please Enter Your Last Name: ");
    lastName = stdIn.nextLine(); 
    System.out.println("Hello " + firstName +""+ lastName + "!");
    System.out.print("Enter Your Age: ");
    age = stdIn.nextLine(); 
    } // end main
}     // end class LastNameFirstNameChapter3

---

-1表示

空格

标记。你从来没有在

firstName

和

lastName

之间加过空格，只是一个空字符串。你试过在引号之间加空格吗？谢谢。骨头头错误。我是新来的谢谢你…几乎在我发布问题的时候我就意识到我错过了“空间”。

import java.util.Scanner;

public class LastNameFirstNameChapter3
{
    public static void main(String[] args)
    {
    Scanner stdIn = new Scanner(System.in);
    String firstName; // Users First Name
    String lastName;  // Users Last Name
    String age;          // Users Age

    System.out.print("Enter Your First Name: ");
    firstName = stdIn.nextLine(); 
    System.out.println("Hello " +" "+ firstName + "!");
    System.out.print("Please Enter Your Last Name: ");
    lastName = stdIn.nextLine(); 
    System.out.println("Hello " + firstName +" "+ lastName + "!");
    System.out.print("Enter Your Age: ");
    age = stdIn.nextLine(); 
    } // end main
}