如何使用扫描仪从键盘上读入一系列字符串，并将它们全部连接在一起

Question

How do I use Scanner to read in a series of Strings from the keyboard, all on one line, and concatenate them.

Here is the code I have so far:

import java.util.Scanner;

public class Exam12Practice {

   public static void main(String[] args) 
   {
      Scanner input=new Scanner(System.in);
      String words="";
      System.out.println("enter a word");
      while(input.hasNext())
      {
         words = words.concat(input.next());
      }

      System.out.println(words);
   }
}

Answer 1

Your code already does what you are asking. To get it to work

Type in your words
Press Enter
Press CTRL-Z (^D on *nix systems)

Some points to note:

input.hasNext() will always return true for STDIN so just pressing Enter on its own won't work.

You could have used input.readLine() and split the words for your exercise.

Most people would probably prefer to use StringBuilder because of the improved performance it provides over String.concat .