Java interface Programming-Create a simple framework that can draw graphics

Introduction: A total of 3. Java files are used to create a simple interface programming framework.

1th file: Nothelloworldcomponent.java

//nothelloworldcomponent.java
1 Importjava.awt.*;2 Importjava.awt.geom.*;3 Importjavax.swing.*;4 5  Public classNothelloworldcomponentextendsJComponent {6      Public Static Final intmessage_x = 75; Top left corner of message coordinates7      Public Static Final intMessage_y = 75;8     
Define the default dimensions for this interface9     Private Static Final intDefault_width = 300; Ten     Private Static Final intDefault_height = 300; One     
Paintcomponent () is automatically called by the system, and the system automatically passes a graphics object to it A      Public voidpaintcomponent (Graphics g) { -Transforms G into a Graphics2D object, used as a brush to draw 2D graphics -graphics2d g2 =(graphics2d) G; the         
Create a Rectangle2D Rectangle object
If there are other shapes that need to be drawn, you can define them here first, and then draw them in the next section with G2 as brushes. -         DoubleLEFTX = 50; -         DoubleTopy = 50; -         Doublewidth = 200; +         DoubleHeight = 150; -Rectangle2D rect =Newrectangle2d.double (LEFTX, topy, width, height); +         
Draw text and rectangular shapes with brush G2 AG2.drawstring ("Not a Hello, the World program", message_x, message_y);  at G2.draw (rect); -          -     } -     
Override this function to set the preferred size - @Override -      PublicDimension getpreferredsize () { in         return NewDimension (Default_width, default_height); -     } to}

2nd. java File: Nothelloworldframe.java

 1  import   Javax.swing.JFrame;  2  3  public  class  nothelloworldframe extends  Span style= "COLOR: #000000" > JFrame { 4   Public   Nothelloworldframe () { 5  add (new   nothelloworldcomponent ());     6  pack (); //  7  }  8  }

Description: JFrame is a framework class that is used to include JPanel and JComponent.

3rd. java File: Nothelloworld.java

1 ImportJava.awt.EventQueue;2 3 ImportJavax.swing.JFrame;4 5  Public classNothelloworld {6      Public Static voidMain (string[] args) {7Eventqueue.invokelater (NewRunnable () {///using Anonymous internal class technology, create a thread that uses threads to create a window program8              Public voidrun () {9JFrame frame =Newnothelloworldframe ();TenFrame.settitle ("Nothelloworldframe");  One frame.setdefaultcloseoperation (jframe.exit_on_close); Close the window while the program ends, avoiding the memory garbage AFrame.setvisible (true); Open Window Visible -             } -         }); the     } -}

Description: For simple use of anonymous inner classes, see this blog: http://www.cnblogs.com/nerxious/archive/2013/01/25/2876489.html

Java interface Programming-Create a simple framework that can draw graphics