Concatenate User Input JAVA

Question

This is what I have so far. I want the program to print out the words the user inputs as a sentence. But I don't know how I get that to happen with the code I have written so far. ex: if you entered Hello World done

The program should say: "Hello World"

import java.util.Scanner;

public class Chapter3ProblemsSet {

    public static void main(String [] args) {

    String word = "";
    final String SENTINEL = "done";
    double count = 0; 

    String userInput = "";

    Scanner in = new Scanner (System.in);


    System.out.println("Please enter words: ");
    System.out.println("Enter done to finish.");
    word = in.next();

    do {
        word = in.next();
        count++;   
        System.out.print(" "+word);
    }
    while (!word.equals(SENTINEL));


    System.out.println(" "+word);

    }
}

Homework hint: define a variable scoped to your main method, add user input to the variable (String.concat() is one way), and output to screen. — IdusOrtus
– IdusOrtus, Commented Oct 14, 2014 at 19:50

StackFlowed · Accepted Answer · 2014-10-14 20:02:46Z

2

What you need it to store it in a variable which is declared outside the loop.

StringBuilder sentence=new StringBuilder();
do {
    word = in.nextLine();
    count++;   
    System.out.print(" "+word);
    sentence.append(" "+word);
}
while (!word.equals(SENTINEL));

Then for printing use

System.out.println(sentence.toString());

edited Oct 14, 2014 at 20:02

answered Oct 14, 2014 at 19:50

StackFlowed

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Comments

Chris Franklin · Accepted Answer · 2014-10-14 19:55:57Z

You will need to create an additional string to "collect" all of the words that the user enters. The problem with your original is that you replace 'word' with the word entered. This should do the trick:

import java.util.Scanner;

public class Chapter3ProblemsSet {

    public static void main(String [] args) {

    String word = "";
    String sentence = "";
    final String SENTINEL = "done";
    double count = 0; 

    String userInput = "";

    Scanner in = new Scanner (System.in);


    System.out.println("Please enter words: ");
    System.out.println("Enter done to finish.");
    word = in.next();

    do {
        word = in.next();
        count++;
        sentence += " " + word;


        System.out.print(" "+word);
    }
    while (!word.equals(SENTINEL));


    System.out.println(" "+sentence);

    }
}

June · Accepted Answer · 2014-10-14 19:53:09Z

1

You can read it by pieces and put them together using a StringBuffer - http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuffer.html

StringBuffer sb = new StringBuffer();
do {
        sb.append( in.next() );
        count++;   
    }
    while (!word.equals(SENTINEL));

answered Oct 14, 2014 at 19:53

June

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