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Introduction to Java

Getting started with GraphicsGetting started with Graphics

Today, we're going to learn about Java graphics. Graphics is the visual representation of images and shapes on a computer screen. In Java, we can create graphics using the java.awt and javax.swing packages. These packages contain classes and interfaces that provide the tools to create graphics and animations. Let's start by creating a simple program that displays a window with a colored rectangle. First, we need to import the necessary classes.


Next, we must create a class extending the JPanel class. This class will be responsible for drawing the graphics.


In the paintComponent method, we use the Graphics object to set the color of the rectangle to red and fill a rectangle with the fillRect method. Finally, we need to create a JFrame object to display the window and add the JPanel object.


In the main method, we create a JFrame object and give it the title "My First Graphics". We set the default close operation to exit the program when the window is closed. Then, we add the MyDrawing panel to the frame and set its size to 200x200 pixels. Finally, we set the frame to be visible. When running this program, you should see a window with a red rectangle.

This is a simple example of what you can do with Java graphics. Adding shapes, images, and text can create more complex graphics and animations. You can also use color, gradients, and transparency to make your graphics more interesting.

Now that you have a basic understanding of Java graphics, here are some things you can learn next to enhance your skills.

  • Learn how to draw different shapes such as circles, triangles, and lines using the Graphics class. You can also customize the shape's color, size, and style;
  • Learn how to display and manipulate images in a Java graphics program. This includes loading images from a file, resizing images, and drawing images on the screen;
  • Learn how to create animations in Java graphics. This includes moving shapes and images across the screen, changing their size and color, and creating smooth transitions between different graphics;
  • Learn how to respond to user events such as mouse clicks and key presses. You can use event handling to create interactive graphics applications that allow.


As you can understand, Java is a generic programming language where you can do everything you can do with a programming language. You can use Java for network programming, web development, graphic development, game development, embedded application development, and even AI development. All of this will be covered in separate courses.

1. What is the class used to create a graphical user interface in Java?
2. What is the method used to add a component, such as a button, to a JFrame in Java?


What is the class used to create a graphical user interface in Java?

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What is the method used to add a component, such as a button, to a JFrame in Java?

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Section 5.

Chapter 5