SOURCE CODE FILES FOR UserInterfaces EXAMPLES

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// Project ToUpperCase
// Class ToUpperCase
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class ToUpperCase extends Applet implements ActionListener
{
    // Instance variables for components.
    private TextField word;
    private Button change;
    
    // This method initializes the applet.
    public void init()
    {
        // Create components.
        word = new TextField(16);
        change = new Button("Change to Uppercase");
        
        // Add components to applet.
        add(word);
        add(change);
        
        // Add ActionListener to button.
        change.addActionListener(this);
        
        // Set size of applet.
        setSize(200, 75);
    }
    
    // This method is required to implement the ActionListener.
    public void actionPerformed(ActionEvent e)
    {
        String s;
        s = word.getText();
        s = s.toUpperCase();
        word.setText(s);
    }
}

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// Project ComputeWages1
// Class ComputeWages
    
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class ComputeWages extends Applet implements ActionListener
{
    // Instance variables for components.
    private TextField hours;
    private TextField hourlyRate;
    private TextField wage;
    private Button compute;
    
    // This method initializes the applet.
    public void init()
    {
        // Create components.
        hours = new TextField(12);
        hourlyRate = new TextField(12);
        wage = new TextField(12);
        compute = new Button("Compute Wage");
        
        // Add components to applet.
        add(hours);
        add(hourlyRate);
        add(wage);
        add(compute);
        
        // Add ActionListener to button.
        compute.addActionListener(this);
        
        // Set size of applet.
        setSize(200, 200);
    }
    
    // This method is required to implement the ActionListener.
    public void actionPerformed(ActionEvent e)
    {
        double h, hr, t;
        
        // Get inputs.
        h = Double.parseDouble(hours.getText());
        hr = Double.parseDouble(hourlyRate.getText());
        
        // Compute total wages.
        if (h > 40)
            t = 40 * hr + (h - 40) * 1.5 * hr;
        else
            t = h * hr;
            
        // Display output.
        wage.setText(String.valueOf(t));
    }
}

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// Project ComputeWages2
// Class ComputeWages
    
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
    
public class ComputeWages extends Applet implements ActionListener
{
    // Instance variables for components.
    private TextField input;
    private TextField output;
    private Button compute;
    
    // This method initializes the applet.
    public void init()
    {
        // Create components.
        input = new TextField(12);
        output = new TextField(12);
        compute = new Button("Compute Wage");
        
        // Add components to applet.
        add(input);
        add(output);
        add(compute);
        
        // Add ActionListener to button.
        compute.addActionListener(this);
        
        // Set size of applet.
        setSize(200, 200);
    }
    
    // This method is required to implement the ActionListener.
    public void actionPerformed(ActionEvent e)
    {
        String s;
        double h, hr, total = 0.0;
        StringTokenizer st;
        
        if(!input.getText().equals(""))
        {
            st = new StringTokenizer(input.getText(), " ");
            h = Double.parseDouble(st.nextToken());           
            hr = Double.parseDouble(st.nextToken());
            if (h > 40.0)
                total += 40.0 * hr + (h - 40.0) * 1.5 * hr;
            else
                total += h * hr;
                
            // Display result.
            output.setText(String.valueOf(total));
            
            // Clear the input textfield for next input.
            input.setText("");
            
            // Transfer focus to next control,
            // namely the input textfield.
            compute.transferFocus();
        }
    }
}

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// Project KidArray3
// Class MyApplet

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
public class MyApplet extends Applet implements ActionListener
{
    // Declare instance variables.
    private String[] kidStrings =
        {"Jane,F,29", "Tom,M,31", "Susan,F,28",
         "Bill,M,35", "Karen,F,34"};
    private Kid[] kids;
    private TextField soughtName;
    private TextField soughtGender;
    private TextField soughtAge;
    private Button find;
             
    public void init()
    {
        int i, anAge;
        String aName;
        char aGender;
        StringTokenizer st;
    
        // Create array of Kid reference variables.
        kids = new Kid[kidStrings.length];
        
        // Create Kid objects and place them in kids array.
        for(i = 0; i < kidStrings.length; i++)
        {
            st = new StringTokenizer(kidStrings[i], ",");
            aName = st.nextToken();
            aGender = st.nextToken().charAt(0);
            anAge = Integer.parseInt(st.nextToken());
            kids[i] = new Kid(aName, aGender, anAge);
        }
        
        // Create component objects.
        soughtName = new TextField(12);        
        soughtGender = new TextField(12);
        soughtAge = new TextField(12);
        find = new Button("Get Kid Info");
        
        // Add components to applet.
        add(soughtName);
        add(soughtGender);
        add(soughtAge);
        add(find);
        
        // Add action listener to button.
        find.addActionListener(this);
        
        // Set size of applet.
        setSize(150, 150);
    }
            
    public void actionPerformed(ActionEvent e)
    {
        int i;        

        // Search for name in kids array.
        for(i = 0; i < kids.length; i++)
            if(kids[i].getName().equals(soughtName.getText()))
            {
                soughtGender.setText(
                    String.valueOf(kids[i].getGender()));
                soughtAge.setText(
                    String.valueOf(kids[i].getAge()));
                return;
            }
            
        // If name not found, clear gender and age textfields.
        soughtGender.setText("");        
        soughtAge.setText("");
    }
}

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//Project KidArray2
//Class Kid

public class Kid
{
    // Private instance variables.
    private String name;
    private char gender;
    private int age;
        
    // Parameterized constructor, which 
    // performs data validation.
    public Kid(String aName, char aGender, int anAge)
    {
        name = aName;
        gender = aGender;
        age = anAge;
    }
            
    // Accessor method for name.
    public String getName()
    {
        return name;
    }
    
    // Accessor method for gender.
    public char getGender()
    {
        return gender;
    }
    
    // Accessor method for name.
    public int getAge()
    {
        return age;
    }
    
    // toString method returns object
    // information as a string.
    public String toString()
    {
        return name + " " + gender + " " + age;
    }
}

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