Fixing a bug on Adding & Deleting an Array index

[Jere Johnson]

My program does the general processing correctly.
By entering a character in the textField, i am able to Search for the character i am looking for and count how many times it appears in the array. The problem i am currently running into is that the character i search for in the array, gets added to an array index. I am also having the same issue entering "end" to finish the array.
I dont want this extra add "glitch" to happen. How can i manipulate this process, so that the character i search for is not added to my array?

Here is my program

 * This program will let the user enter the names of several cities and put the city names
 * into a String array of 20 cells. When "end" is entered in place of a city name,
 * the program should do the following tasks: a) Display the city names in alphabetical order.
 * and b) let the user enter a letter of the alphabet and find how many times that
 * letter (either uppercase or lowercase) appears in the array of city names.
 */
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;

public class Assignment8 extends Applet implements ActionListener {

private TextField input;
private Label inputLabel;
private String [] cityNames = new String [20];
private boolean textEntered = false;
//private boolean textEnteredDone = false;
private boolean displayNow = false;
private boolean clickSearch = false;
private String End = "end";
private String textValue;
private int k=0; //variable for adding data to array
private int i;//loop variable
private char lookChar; // search for this character 
private Button search;

public void init() 
{
//Label for TextField input
inputLabel = new Label ("Please type a City Name: ");
add (inputLabel);

//input TextField for entering city names
input = new TextField (20);
add (input);
input.addActionListener(this);

//Button for searching single Character
search = new Button ("Search for Character");
add (search);
search.addActionListener(this);
}
public void paint(Graphics g) 
{
g.drawString ("Array output below",50,75);
g.drawLine (50,80,150,80);


if (textEntered)
{
addData(cityNames);

if (textValue.equals(End))
{
sort (cityNames);
display (cityNames, g);
}

if (clickSearch)
{
searchChar(cityNames, g);
sort (cityNames);
display (cityNames, g);
}

} // end of boolean textEntered


} // end of paint method

public void actionPerformed(ActionEvent event)
{
textEntered = true;

textValue = input.getText();

if (event.getSource() == search)
clickSearch = true;

input.setText(null);

repaint ();
}


//Methods are below. addData, sort, display and searchChar methods
//________________________________________________________________

//method adds data to array
public void addData (String [] array)
{array[k++] = textValue; }


//sort method below is type bubble sort
public void sort(String [] array)
   {
   String temp;

   for (int pass=0; pass < (array.length - 1); pass++)
   for (i=1; i < array.length; i++)
   if (array[i]!=null) // null values excluded
   { 
   
   if (array[i].compareTo(array[i-1]) < 0){
   temp = array [i];
   array [i] = array [i-1];
   array [i-1] = temp;}
      }
   
   }
     
   // method displays array values  
     public void display (String [] array, Graphics g)
     {
     int yValue=110; 
  
  for (int w=0; w < array.length; w++)  
     {g.drawString("City "+w+" is "+array[w], 70, yValue);      
  yValue +=20;   } 
     }
                   
 
 // method searches for a single character and 
 // displays how many times it appears in array
public void searchChar (String [] array, Graphics g)
{
int count = 0;
String lookText;
lookChar  = textValue.charAt(0);


for (int i=0; i<array.length; i++)
if (array[i]!=null)// null values excluded
{
lookText = array [i];
for (int p=0; p < array[i].length(); p++)
if (lookText.charAt (p) == (lookChar))
count++;
}

g.drawString ("The letter " +lookChar+" was found "+count+" times in your array", 180,100);

}

} // end of program

  

[Balaji Natarajan]

Try this code...slightly modified urs....

 /* This program will let the user enter the names of several cities and put the city names
 * into a String array of 20 cells. When "end" is entered in place of a city name,
 * the program should do the following tasks: a) Display the city names in alphabetical order.
 * and b) let the user enter a letter of the alphabet and find how many times that
 * letter (either uppercase or lowercase) appears in the array of city names.
 */
 import java.awt.*;
 import java.applet.Applet;
 import java.awt.event.*;
 public class Assignment8 extends Applet implements ActionListener {
 private TextField input;
 private Label inputLabel;
 private String [] cityNames = new String [20];
 private boolean textEntered = false;
 //private boolean textEnteredDone = false;
 private boolean displayNow = false;
 private boolean clickSearch = false;
 private String End = "end";
 private String textValue;
 private int k=0;
 //variable for adding data to array
 private int i;
 //loop variable
 private char lookChar;
 // search for this character
 private Button search;
 private Button addcity;
 public void init() {
 //Label for TextField input
 inputLabel = new Label ("Please type a City Name: ");
 add (inputLabel);
 //input TextField for entering city names
 input = new TextField (20);
 add (input);
 input.addActionListener(this);
 //Button for adding a new city
 addcity = new Button ("Add the City");
 add (addcity);
 addcity.addActionListener(this);
 //Button for searching single Character
 search = new Button ("Search for Character");
 add (search);
 search.addActionListener(this);
}
public void paint(Graphics g) {
g.drawString ("Array output below",50,75);
g.drawLine (50,80,150,80);
if (clickSearch) {
searchChar(cityNames, g);
sort (cityNames);
}
else {
if(textValue.equals(End))
display(cityNames,g);
else
addData(cityNames);
}
} // end of paint method
public void actionPerformed(ActionEvent event){
textEntered = true;
textValue = input.getText();
if (event.getSource() == search)
clickSearch = true;
if (event.getSource() == addcity)
clickSearch = false;
input.setText(null);
repaint ();
}
//Methods are below. addData, sort, display and searchChar methods
//________________________________________________________________
//method adds data to array
public void addData (String [] array){
array[k++] = textValue;
}
//sort method below is type bubble sort
public void sort(String [] array)   {
String temp;
for (int pass=0; pass < (array.length - 1); pass++)
for (i=1; i < array.length; i++)
if (array[i]!=null) // null values excluded
{
if (array[i].compareTo(array[i-1]) < 0){
temp = array [i];
array [i] = array [i-1];
array [i-1] = temp;
}
}
}        // method displays array values
public void display (String [] array, Graphics g) {
int yValue=110;
for (int w=0; w < array.length; w++)
if(array[w] != null) {
g.drawString("City "+w+" is "+array[w], 70, yValue);
yValue +=20;
}
}
// method searches for a single character and
// displays how many times it appears in array
public void searchChar (String [] array, Graphics g) {
int count = 0;
String lookText;
lookChar  = textValue.charAt(0);
for (int i=0; i<array.length; i++)
if (array[i]!=null)// null values excluded
{
lookText = array [i];
for (int p=0; p < array[i].length(); p++)
if (lookText.charAt (p) == (lookChar))
count++;
}
g.drawString ("The letter " +lookChar+" was found "+count+" times in your array", 180,100);
}
} // end of program