CS288 Lab Exercise 3

Open PersonGui Files Go to Course web site for PersonGui source files http://www.computing.surrey.ac.uk/courses/cs288/Examples/PersonGui Make copies of these files in you home folder and then open them in some editor (e.g. Emacs): PersonGui.java PersonMaker.java Person.java images.zip (unzip this file in the same directory as you have put the java files) Download a copy of these slides so that you can read them directly, and not simply view them in Internet Explorer. This is handy as you can then copy and paste code examples directly from these slides.

Overview At the moment with the PersonGui we can define age, height, first name and last name. In this lab you will add a new attribute, eye colour together with all the supporting code to add a new entry to the pop-up menu. That means there will be a new menu item on the pop-up menu to choose the eye colour of a person.

Overview So that when you choose to finally create a new person in a JFrame, this will appear with an extra attribute for eye colour:

1: PersonMaker.java Open PersonMaker.java in Emacs. Define a new instance field: private String eye_colour = ""; in the same place as you find these declarations: private String first_name = ""; private String last_name = ""; Next define methods: setEyeColour and getEyeColour in just the same way as you defined setLastName and getLastName

1: PersonMaker.java Next change the String Make_Person method, so that it includes information about the eye colour of the person. Do this in exactly the same way that the method includes the age and height of a person. Check that this code compiles correctly: javac PersonMaker.java

2: Person.java Next, open the Person.java file in Emacs. Change the constructor so that it has an extra parameter for the eye colour: public Person(String first_text, String last_text, String age_text, String height_text, String eye_colour_text, boolean bool_cat ) Next declare a new JLabel label_eye_colour with all the other JLabel declarations: To do this you will have to search through the file for the keyword JLabel until you find the line where all the other labels such as label_height are declared.

2: Person.java Next find the lines of code: label_height = new JLabel(height_text); set_fonts(label_height); Do the same thing for the eye_colour_text string and the label_eye_colour JLabel. I.e. create a new JLabel, using the eye_colour_text string, assign it to label_eye_colour, and then set the fonts for this new JLabel. Next add these lines: c.gridx = 4; c.gridy = 0; add(label_eye_colour, c); immediately after these lines: c.gridx = 3; add(label_height, c);

2: Person.java Next change this line: c.gridwidth = 4; to Now go back to the file PersonMaker.java. Change the creation of Person newContentPane to take account of the fact we have added an extra parameter to the Person constructor method for eye colour. Check that this code compiles correctly: javac Person.java javac PersonMaker.java (Remember that some times it is necessary to remove all .class files to make the compiler properly recompile your source files)

3: PersonGui.java Open PersonGui.java in Emacs Find the line static final private String POPUP_2 = "Surname of Person"; Add a new line immediately after this: static final private String POPUP_2_1 = "Eye Colour of Person"; Next find the text: menuItem = new JMenuItem(POPUP_2); menuItem.addActionListener(this); popup.add(menuItem); After this add three appropriate lines so that we have the same pattern of code here for POPUP_2_1, (so that exactly the same is done for POPUP_2_1 as is done for POPUP_2, and POPUP_1 for that matter).

3: PersonGui.java Now for the harder part. Find the part of the code: } else if(POPUP_2.equals(cmd)) { String text = textField.getText(); textField.setText(""); dude.setLastName(text); description = "The Persons Last Name is: " + " \"" + dude.getLastName() + "\"\n"; } You now have to insert code of this same pattern for POPUP_2_1. The difference is that you will not use setLastName and getLastName since you want to define the eye colour of someone. Check in PersonMaker.java to see what methods you defined for setting and getting the eye colour and use those methods for POPUP_2_1. In the new code you will want the description variable to say something about eye colour rather than the last name.

4: Finally Compile and run the code. Check that you get a new entry in the JFrame that shows all the attributes, and that the text frame in the original JFrame shows the eye colour. Next go back to PersonMaker.java and change the constructor so that it include a default value for eye colour as well as all the other attributes.