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Java Programming - Essay Example

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Summary
I have designed the calculator using JAVA. Swing is the concept that has been employed in it. I have used many features of JAVA in designing the calculator. From the line no 5 to 26 I have used the inbuilt packages in JAVA library and used the concept of inheritance to import the required files using the import statement.
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Java Programming
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Java Programming

Download file to see previous pages... Here we have used the access specifier as public which tells us that the class can be accessed anywhere in the program. In the same line we have used the concept of Inheritance, which is the process by which one object acquires the properties of another object. By the use of extends keyword we inherit all the functionality provided in the class JFrame, which is used to create a frame using Swings. Further we implement the interface ActionListener using the implements keyword. By interface we mean that we can specify what a class must do, but now how it does it. Here we have implemented the ActionListener interface and so we have to define it. The purpose of ActionListener interface is to receive the Action Events. When the action event occurs, that object's action Performed method is invoked. Moving into the class body, we have declared variables with final keyword so that their value retains constant throughout the program. Then from line no 41 onwards we have created the objects of classes that will be used in the program and are defined with access specified private so that only the code inside this class can manipulate them. At line no 56 we see the constructor, which initializes an object immediately upon creation. It has the same name as the class in which it resides. The constructor is automatically called after the object is created. From the line no 63 onwards we have referenced the various objects and then called their respective methods to do the job. The new operation instantiates an object of a particular class, and returns a reference to it.
At line no 126, I have used the syntax

Container contentPane = getContentPane();

Here the method get ContentPane returns the contentPane object for this frame. And further we add components to the frame. From line no 138 I have created the buttons for the calculator using grid layout. The GridLayout class is a layout manager that lays out a container's components in a rectangular grid. The container is divided into equal-sized rectangles, and one component is placed in each rectangle. Then using the predefined class JButton we have created the buttons for the sign +, -, * and so on. At line no 192 we have set panel layout manager for a 4 by 5 grid. Then from line no 198 we add buttons to keypad panel starting at top left. We set the layout of masterpanel as border layout at the line no 239

masterPanel.setLayout(new BorderLayout());

and then we add the components in west, east and south direction. At line 246 we use request
focus which requests that this Component gets the input focus. From line no 251 we have used addActionListener method to register the events. At line 260 we used the method addWindowListener which adds the specified window listener to receive window events from this window. It is used for closing frame and ending program. As we mentioned above whenever an action is performed the function

Public void actionPerformed(ActionEvent e)

is automatically called. This method is invoked when an action occurs. From the line no 299 we have used an important feature of JAVA called the switch-case. The switch statement in Java provides a convenient method for branching a program based on a number of conditionals.
From line no 499 we have used various methods like

setDisplayString(), getDisplayString (), addDigit(int digit), ...Download file to see next pagesRead More
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