Java Tutorial Lab 4

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2016 Winter
LAB #4
Prepared by: Berk Soysal

Inheritance is one of the most important
features of Object-Oriented Programming
(OOP).
Inheritance allows a class to get ...

Every Class extends the Object Class
The Object class, in the java.lang package, sits at the top of the class hierarchy tr...

To reduce the complexity and simplify the language,
multiple inheritance is NOT supported in Java.
2016 Winter

Vehicle.java
Car.java
Truck.java
2016 Winter Folder  Lab4 Lab4 Examples Inheritance

• Any class containing an abstract method is
an abstract class
• You must declare the class with the
keyword abstract:
abs...

2016 Winter
An interface is a way to describe what classes should
do, without specifying how they should do it. It’s not a...

• Why bother introducing two concepts: abstract class and interface?
abstract class Comparable {
public abstract int compa...

2016 Winter

 An option pane is a simple dialog box for graphical
input/output
• Advantages:
– simple
– flexible (in some ways)
– look...

• public static void showMessageDialog(
Component parent, Object message)
Displays a message on a dialog
with an OK button...

• showMessageDialog is analogous to
System.out.println for displaying a simple message
import javax.swing.*;
public class ...

• showConfirmDialog analogous to a System.out.print
that prints a question, then reading an input value from the
user (can...

• showInputDialog is analogous to a
System.out.print that prints a question, then
reading an input value from the user (ca...

Swing is a GUI widget toolkit for Java. It is part of
Oracle's Java Foundation Classes (JFC) – an API for
providing a grap...

JFrame: a heavy-weight container used as the top-level window.
JPanel: a light-weight container used to organize GUI compo...

2016 Winter

2016 Winter
• The game Puzzler consists of a 7 × 7 board.
Initially, all the cells are filled with marbles from
one to fiv...

You can clearly see the important role of inheritance and interface for
this game. Each of the three classes is derived fr...

2016 Winter

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