An issue with arrays

Question

I am trying to write an applet which accepts five integers from the user, stores them in an array and then outputs them to a JTextArea. That bit is fine. But I also need to write it so that if the user enters two identical integers then it does not output the duplicate. (This is an exercise from Deitel & Deitel - yes, I'm a beginner! And I am aware that it mixes awt with swing...but that's what the book asks for).
This is what I have written so far:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InclusiveArray extends JApplet implements ActionListener {
     JLabel promptLabel;
     JTextField inputField;
     JTextArea outputField;
     int[] array = new int[5];
     int i = 0;
     String output = "The array contains: ";
     //create GUI
     public void init()
          Container container = getContentPane();
          container.setLayout(new FlowLayout());
          promptLabel = new JLabel("Enter a whole integer: ");
          inputField = new JTextField(10);
          inputField.addActionListener(this);
          outputField = new JTextArea(20, 20);
          container.add(promptLabel);
          container.add(inputField);
          container.add(outputField);
     } //end method init
     public void actionPerformed(ActionEvent event)
          array[i] = Integer.parseInt(event.getActionCommand());
          ++i;
          output += array[i] + " ";
          if (i>0)
          if (array[i] != array[0] && array != array[1] && array[i] != array[2] && array[i] != array[3] && array[i] != array[4])
               output += array[i] + " ";
          /*else
               output += " same ";*/
          outputField.setText(output);
          output = "\n The array now contains: ";
This works, but, of course, the applet stops outputting integers as soon as it gets to array != array[1] because, of course, array[1] will always be equal to array[1].
I am trying to find a way to compare the integer with every elements in the array apart from the integer itself.
I found a way to compare each integer with the integer before it, in the array. And that worked - but it's not exactly what I need.
Can anybody point me in the right direction?
-Eoghain
Message was edited by:
        Eoghain                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

Thank you all for your help. I decided to use a method to sort the array as I'm still not familiar with HashMap or LinkedHashSet. I'll go and read up on them now...
In the meantime, here's my code. I have a question - I spent a while playing around with the code but I found that my output always contained only 4 elements when, in fact, the array contained 5 (this was verified by outputting the contents of the array to the screen using System.out.println). I solved this by initializing the array with 6 elements instead of 5. There is now a 'wasted' zero at the end which does not show up in the output.
How could I do this with a 5-elements array? I'm sure the answer is staring me in the face, but I can't seem to find it!
/*An applet to input 5 numbers, each of which is between 10 and 100 inclusive.
  As each number is read, display it only if it is not a duplicate of a number
  already read. Use the smallest possible array. Display results in a JTextArea.
  Use setText to update the results after each value is input by the user. */
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class InclusiveArray2 extends JApplet implements ActionListener {
     JLabel promptLabel;
     JTextField inputField;
     JTextArea outputField;
     int[] array = {0, 0, 0, 0, 0, 0};
     int i = 0;
     String output = "The array contains: ";
     //create GUI
     public void init()
          Container container = getContentPane();
          container.setLayout(new FlowLayout());
          promptLabel = new JLabel("Enter a whole integer: ");
          inputField = new JTextField(10);
          inputField.addActionListener(this);
          outputField = new JTextArea(20, 20);
          container.add(promptLabel);
          container.add(inputField);
          container.add(outputField);
     } //end method init
     public void actionPerformed(ActionEvent event)
          array[i] = Integer.parseInt(event.getActionCommand());
          ++i;
          for(int z = 0; z < array.length; z++)
          System.out.print("The array is now: " + array[z] + "\n");
          if (i == array.length-1)
               sortArray(array);
     public void sortArray(int[] array2)
          //loop to control number of passes
          for (int pass = 1; pass < array2.length; pass++)
               //loop to control number or comparison
               for (int element = 0; element < array2.length-2; element++)
                    //compare side-by-side elements and swap if first > second
                    if (array2[element] > array2[element+1])
                         swap(array, element, element+1);
          buildOutput(array2);
     public void swap(int array4[], int first, int second)
          int hold; //temp holding area for swap
          hold = array4[first];
          array4[first] = array4[second];
          array4[second] = hold;
     public void buildOutput(int[] array3)
          for (int y = 0; y < array3.length-1; y++)
               if(array[y+1] != array[y])
                    output += array3[y] + " ";
          outputField.setText(output);
          output = "\n The array now contains: ";
}Thanks in advance,
-Eoghain