Frequent question: How do you code a rectangle in Java?

How do you draw a rectangle in Java Swing?

To draw a rectangle in Swing you should:

  1. First of all, never draw directly in the JFrame or other top-level window.
  2. Instead draw in a JPanel, JComponent or other class that eventually extends from JComponent.
  3. You should override the paintComponent(Graphics g) method.
  4. You should be sure to call the super method.

How do you code a shape in Java?

We are going to use some the built in classes that Java offers. Basically to create simple shapes in Java: Use Line2D , Ellipse2D , Rectangle2D , RoundRectangle2D , Arc2D , Area to create some simple shapes. Then use Graphics2D class and its draw function ton paint each shape an a new Frame .

Which method is used to draw a rectangle?

Answer: To draw a rectangle, use the drawRect() method of a Graphics object. This method looks like: drawRect(int x, int y, int width, int height).

What is fillRect in Java?

fillRect. public abstract void fillRect(int x, int y, int width, int height) Fills the specified rectangle. The left and right edges of the rectangle are at x and x + width – 1 . The top and bottom edges are at y and y + height – 1 .

IT IS INTERESTING:  Is valid JSON schema?

How do you fill a Shape with color in Java?

To fill rectangles with the current colour, we use the fillRect() method. In the example we draw nine coloured rectangles. Graphics2D g2d = (Graphics2D) g; There is no need to create a copy of the Graphics2D class or to reset the value when we change the colour property of the graphics context.

What colors are in Java?

Colors in Java

Color RGB Value
Dark brown 51- 0 – 0
Purple 102- 0 -153
Black 0 – 0 – 0
White 255-255-255

What is paintComponent method in Java?

By now you know that the paintComponent method is where all of your painting code should be placed. It is true that this method will be invoked when it is time to paint, but painting actually begins higher up the class hierarchy, with the paint method (defined by java. awt.

Which tool is used to execute an applet?

Using an applet viewer, such as the standard tool, applet-viewer. An applet viewer executes your applet in a window. This is generally the fastest and easiest way to test your applet.

What is shape in Java?

The Shape interface provides definitions for objects that represent some form of geometric shape. The Shape is described by a PathIterator object, which can express the outline of the Shape as well as a rule for determining how the outline divides the 2D plane into interior and exterior points.

Can you draw in Java?

Java provides a ton of great tools for drawing lines and shapes. Through the Graphics or Graphics2D class, we can draw and fill a wide variety of items. When drawing shapes, you create a paint method that invokes the Graphics class. You can draw a line with drawLine and rectangles with drawRect.

IT IS INTERESTING:  You asked: What is the use of white space in Java?

How do you find the area and perimeter of a rectangle in Java?

Logic to find perimeter and area of a rectangle

  1. Input length and width of rectangle from user. …
  2. Apply formula to calculate rectangle perimeter i.e. perimeter = 2 * (length + width) .
  3. Apply formula to calculate rectangle area i.e. area = length * width .
  4. Finally, print the value of perimeter and area .
Categories PHP