Programming and Problem Solving with Java

CASE STUDY

674

Therefore, we must make countbe a field that other methods can access. Here is the

code for our applet, followed by a picture showing execution by the applet viewer:

//***********************************************************

// This applet prompts a user to input an integer value and

// reports if the value is in a list and how many comparisons

// it took to make that determination.

//***********************************************************

importjava.applet.Applet;

importjava.awt.*; // Supplies user interface classes

importjava.awt.event.*; // Supplies event classes

importjava.util.*; // Supplies Random class

public classSearch extendsApplet implementsActionListener

{

private int[] values; // Values to be searched

private intcount = 0 ; // Comparison count

private final intSIZE = 100 ; // Size of the array

// Event handler method

public voidactionPerformed(ActionEvent event)

{

intvalue;

value = Integer.parseInt(inputField.getText());

inputField.setText("");

if(isThere(value))

outLabel.setText(value + " is in list found with "

+ count + " comparisons");

else

outLabel.setText(value + " is not in list determined with "

+ count + " comparisons");

}

private booleanisThere (intitem)

// Returns true if the item is in the array;

// otherwise, returns false

{

booleanmoreToSearch;

intlocation = 0 ;

booleanfound = false;

count = 0 ;

moreToSearch = (location < SIZE);