Small example of drawing with javaswing---

Javaswing is the necessary knowledge to make desktop programs, but the personal feeling, or a bit, but the effect can be achieved! I used this change before to monitor the computer CPU utilization of the application, this example is still very good!

1 Importjava.awt.BorderLayout;2 ImportJava.awt.EventQueue;3 4 ImportJavax.swing.JFrame;5 ImportJavax.swing.JPanel;6 ImportJavax.swing.border.EmptyBorder;7 8 9 Ten Importjavax.swing.*; One Importjava.awt.*; A Importjava.util.ArrayList; - Importjava.util.Collections; - Importjava.util.List; the ImportJava.util.Random; -  - classDatareceiverextendsJPanel { -     PrivateList<integer> values;//The container that holds the received data. +     Private Static Final intMax_value = 200;//The maximum value of the received data. -     Private Static Final intMax_count_of_values = 50;//the maximum number of data saved. +  A      PublicDatareceiver () { atValues = Collections.synchronizedlist (NewArraylist<integer>()); -  -         //uses a thread to simulate the generation of data. -         NewThread (NewRunnable () { - @Override -              Public voidrun () { inRandom Rand =NewRandom (); -  to                 Try { +                      while(true) { -AddValue (Rand.nextint (max_value));//generates a data and simulates receiving and placing it in a container. the repaint (); *Thread.Sleep (100); $                     }Panax Notoginseng}Catch(interruptedexception e) { - e.printstacktrace (); the                 } +             } A }). Start (); the     } +  - @Override $      Public voidpaintcomponent (Graphics g) { $         Super. paintcomponent (g); -  -Graphics2D g2d =(graphics2d) G; the G2d.setrenderinghint (renderinghints.key_antialiasing, renderinghints.value_antialias_on); - Wuyi         intW =getwidth (); the         inth =getheight (); -         intXDelta = w/max_count_of_values; Wu         intLength =values.size (); -  About          for(inti = 0; i < length-1; ++i) { $G2d.drawline (XDelta * (Max_count_of_values-length +i), Normalizevalueforyaxis (Values.get (i), h), -XDelta * (max_count_of_values-length + i + 1), Normalizevalueforyaxis (Values.get (i + 1) , h)); -         } -     } A  +     /** the * The received data is put into memory. -      * @paramvalue $      */ the     Private voidAddValue (intvalue) { the         //the loop uses a space to receive data. the         //it is best to implement an array of loops, rather than lazy use of ArrayList. the         if(Values.size () >max_count_of_values) { -Values.remove (0); in         } the  the Values.add (value); About     } the  the     /** the * The value of the y-axis direction is regulated. Causes value to be between [0, height] on the y-axis. +      * -      * @paramvalue the      * @paramHeightBayi      * @return the      */ the     Private intNormalizevalueforyaxis (intValueintheight) { -         return(int) ((Double) Height/max_value *value); -     } the  the     Private Static voidcreateguiandshow () { theJFrame frame =NewJFrame (""); the  -Frame.getcontentpane (). Add (Newdatareceiver ()); the  the         //Set Frame ' s close Operation and location in the screen. the frame.setdefaultcloseoperation (jframe.exit_on_close);94Frame.setsize (400, 400); theFrame.setlocationrelativeto (NULL); theFrame.setvisible (true); the     }98  About      Public Static voidMain (string[] args) { - createguiandshow ();101     }102}

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Small example of drawing with javaswing---