How to insert string into the output string stream

Question

I want to simply write code that inserts my userItems into the output string stream itemsOSS. Each of my item will be followed by a space. I want the output to reflect the following for example, "red purple yellow Exit":

Output example,

red purple yellow

public class StringStreamOutput {

   public static void main (String [] args) {

      Scanner scnr = new Scanner(System.in);
      String userItem = "";

      StringWriter itemCharStream = new StringWriter();
      PrintWriter itemsOSS = new PrintWriter(itemCharStream);

      System.out.println("Enter items (type Exit to quit):");
      userItem = scnr.next();

      while (!userItem.equals("Exit")) {

         // confused here, 

         userItem = scnr.next();
      }

      userItem = itemCharStream.toString();
      System.out.println(userItem);

      return;
   }
}

What is "output string stream itemsOSS" ? I don't see anything that reflects something like that in your code. — Nir Alfasi
– Nir Alfasi, Commented Nov 11, 2017 at 14:49
PrintWriter has a print(String) method: docs.oracle.com/javase/7/docs/api/java/io/…. So what's the concrete problem? — JB Nizet
– JB Nizet, Commented Nov 11, 2017 at 14:50
I found the code that works, I just needed to utilize the print method. itemsOSS.print(userItem + " "); userItem = itemCharStream.toString(); — Blank Reaver
– Blank Reaver, Commented Nov 11, 2017 at 15:15

Blank Reaver · Accepted Answer · 2017-11-13 22:20:41Z

3

I found the code that works, I just needed to utilize the print method.

itemsOSS.print(userItem + " "); 

userItem = itemCharStream.toString();

answered Nov 13, 2017 at 22:20

Blank Reaver

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RobertB922 · Accepted Answer · 2019-10-09 17:22:27Z

0

import java.util.Scanner;
import java.io.PrintWriter;
import java.io.StringWriter;

public class StringStreamOutput {
   public static void main (String [] args) {
      Scanner scnr = new Scanner(System.in);
      String userItem;

      StringWriter itemCharStream = new StringWriter();
      PrintWriter itemsOSS = new PrintWriter(itemCharStream);

      System.out.println("Enter items (type Exit to quit):");
      userItem = scnr.next();

      while (!userItem.equals("Exit")) {

         /* Your solution goes here  */
         itemsOSS.print(userItem + " ");


         /* this does not to be added as it sits outside the loop
         userItem = itemCharStream.toString();
         */

         userItem = scnr.next();
      }

      userItem = itemCharStream.toString();
      System.out.println(userItem);
   }
}

This works

answered Oct 9, 2019 at 17:22

RobertB922

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3 Comments

J. Murray Over a year ago

Can you explain it a bit Robert?

RobertB922 Over a year ago

Sure. The only actual thing I added was itemsOSS.print(userItem + " "). This uses the PrintWriter to modify its parameter of ItemCharString. Then userItem is assigned the itemCharString and also calls it toString() method to later be printed as a string. The rest of the code is what the user provided in the original question. And I multi-line commented out the code userItem = itemCharString.toString() because it was already declared outside of the while loop and therefore was just redundant code.

RobertB922 Over a year ago

Sorry I can also explain a bit more on the one line I added. So the itemOSS.print(userItem + " ") calls forth the PrintWriter that has a parameter of the StringWriters itemCharString. This will modify the itemCharString with the parameters of userItem and then add a space between each call of the loop. Because of this we can leave the other userItem = itemCharString.toString(); code out of the loop because we are directly modifying itemCharString through the PrintWriters parameter.

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