Java Alphabetical Sort

[bam010893]

import java.util.Arrays;

public class Names2 {

 public static void main(String[] args) {

  while (!StdIn.isEmpty()){ 
  String choice = StdIn.readString(); 
  String[] myStrArray = new String[] {choice};

  //SORTS STRING ARRAY INTO CASE & THEN ALPHABETICAL ORDER
  Arrays.sort(myStrArray);

  //for loop to print int values to console
  for (int a = 0; a < myStrArray.length; a++) {
    System.out.println(myStrArray[a]);}
  }

 }
}

The program does not seem to be working correctly. It does compile though. It's a problem with using the StdIn. When I ut just names there it works. How do I fix it so the StdIn works so the user can enter multiple names on there own. I am extremely beginner so please be simple and very specific. Thank you very much.

[NormR1]

Where does the StdIn class come from? I don't recognize it as a Java SE class. What JDK are you using to compile the program?

Your program only puts one String in the array and then sorts it. You need redesign your program to create an array outside of the loop and then get the input and store it into the array.

[bam010893]

/*************************************************************************
* Compilation: javac StdIn.java
* Execution: java StdIn
*
* Reads in data of various types from standard input.
*
*************************************************************************/

import java.io.BufferedInputStream;
import java.util.Locale;
import java.util.Scanner;

/**
 *  <i>Standard input</i>. This class provides methods for reading strings
 *  and numbers from standard input.
 *  <p>
 *  The Locale used is: language = English, country = US. This is consistent
 *  with the formatting conventions with Java floating-point literals,
 *  command-line arguments (via <tt>Double.parseDouble()</tt>)
 *  and standard output (via <tt>System.out.print()</tt>). It ensures that
 *  standard input works with the input files used in the textbook.
 *  <p>
 *  For additional documentation, see <a href="http://introcs.cs.princeton.edu/15inout">Section 1.5</a> of
 *  <i>Introduction to Programming in Java: An Interdisciplinary Approach</i> by Robert Sedgewick and Kevin Wayne.
 */
public final class StdIn {

    // assume Unicode UTF-8 encoding
    private static String charsetName = "UTF-8";

    // assume language = English, country = US for consistency with System.out.
    private static Locale usLocale = new Locale("en", "US");

    // the scanner object
    private static Scanner scanner = new Scanner(new BufferedInputStream(System.in), charsetName);

    // static initializer
    static { scanner.useLocale(usLocale); }

    // singleton pattern - can't instantiate
    private StdIn() { }


    /**
     * Is there only whitespace left on standard input?
     */
    public static boolean isEmpty() {
        return !scanner.hasNext();
    }

    /**
     * Return next string from standard input
     */
    public static String readString() {
        return scanner.next();
    }

    /**
     * Return next int from standard input
     */
    public static int readInt() {
        return scanner.nextInt();
    }

    /**
     * Return next double from standard input
     */
    public static double readDouble() {
        return scanner.nextDouble();
    }

    /**
     * Return next float from standard input
     */
    public static float readFloat() {
        return scanner.nextFloat();
    }

    /**
     * Return next short from standard input
     */
    public static short readShort() {
        return scanner.nextShort();
    }

    /**
     * Return next long from standard input
     */
    public static long readLong() {
        return scanner.nextLong();
    }

    /**
     * Return next byte from standard input
     */
    public static byte readByte() {
        return scanner.nextByte();
    }

    /**
     * Return next boolean from standard input, allowing "true" or "1" for true,
     * and "false" or "0" for false
     */
    public static boolean readBoolean() {
        String s = readString();
        if (s.equalsIgnoreCase("true"))  return true;
        if (s.equalsIgnoreCase("false")) return false;
        if (s.equals("1"))               return true;
        if (s.equals("0"))               return false;
        throw new java.util.InputMismatchException();
    }

    /**
     * Does standard input have a next line?
     */
    public static boolean hasNextLine() {
        return scanner.hasNextLine();
    }

    /**
     * Return rest of line from standard input
     */
    public static String readLine() {
        return scanner.nextLine();
    }

    /**
     * Return next char from standard input
     */
    // a complete hack and inefficient - email me if you have a better
    public static char readChar() {
        // (?s) for DOTALL mode so . matches a line termination character
        // 1 says look only one character ahead
        // consider precompiling the pattern
        String s = scanner.findWithinHorizon("(?s).", 1);
        return s.charAt(0);
    }

    /**
     * Return rest of input from standard input
     */
    public static String readAll() {
        if (!scanner.hasNextLine()) return null;

        // reference: http://weblogs.java.net/blog/pat/archive/2004/10/stupid_scanner_1.html
        return scanner.useDelimiter("\\A").next();
    }

   /**
     * Read rest of input as array of ints
     */
    public static int[] readInts() {
        String[] fields = readAll().trim().split("\\s+");
        int[] vals = new int[fields.length];
        for (int i = 0; i < fields.length; i++)
            vals[i] = Integer.parseInt(fields[i]);
        return vals;
    }

   /**
     * Read rest of input as array of doubles
     */
    public static double[] readDoubles() {
        String[] fields = readAll().trim().split("\\s+");
        double[] vals = new double[fields.length];
        for (int i = 0; i < fields.length; i++)
            vals[i] = Double.parseDouble(fields[i]);
        return vals;
    }

   /**
     * Read rest of input as array of strings
     */
    public static String[] readStrings() {
        String[] fields = readAll().trim().split("\\s+");
        return fields;
    }



    /**
     * Unit test
     */
    public static void main(String[] args) {

        System.out.println("Type a string: ");
        String s = StdIn.readString();
        System.out.println("Your string was: " + s);
        System.out.println();

        System.out.println("Type an int: ");
        int a = StdIn.readInt();
        System.out.println("Your int was: " + a);
        System.out.println();

        System.out.println("Type a boolean: ");
        boolean b = StdIn.readBoolean();
        System.out.println("Your boolean was: " + b);
        System.out.println();

        System.out.println("Type a double: ");
        double c = StdIn.readDouble();
        System.out.println("Your double was: " + c);
        System.out.println();

    }

}

It's from a java book. I was told to just use this so the user can enter the names on there own. I do not need help on this part of the code thanks.

[NormR1]

How is the moving the array definition to be outside the loop going?