Skip to main content

Canvas class example in java

           Canvas class example on buttons



import java.applet.*;

import java.awt.*;

import java.awt.event.*;

public class CanvasDemo extends Applet implements ActionListener
{
            Canvas c;

            Button bred,bgreen,bblue;

            public void init()
            {

                        bred=new Button("Red");

                        add(bred);

                        bred.addActionListener(this);

                       
                        bgreen=new Button("Green");

                        add(bgreen);

                        bgreen.addActionListener(this);

                        bblue=new Button("Blue");

                        add(bblue);

                        bblue.addActionListener(this);

                        c=new Canvas();

                        c.setSize(50,50);

                        add(c);

            }
            public void actionPerformed(ActionEvent ae)
            {

                       
                        if(ae.getSource()==bred)
                        {
                                    Color c1=new Color(255,0,0);
                                    c.setBackground(c1);
                        }
                        else
                        {

                                    if(ae.getSource()==bgreen)    
                                    {
                                                Color c2=new Color(0,255,0);
                                                c.setBackground(c2);
                                    }
                                    else
                                    {
                                                Color c3=new Color(0,0,255);
                                                c.setBackground(c3);
                                    }
                        }
            }
}

 FACEBOOK PAGE  :- Practice program -JAVA

Comments

Post a Comment

Popular posts from this blog

Menu bar example with applet viewer in java

      Menu bar +applet viewer example-3 import java.applet.*; import java.awt.*;  /*   <applet code="MenuDemo" height=200 width=200>   </applet> */ public class MenuDemo extends Applet {             public void init( )             {                         Menus m = new Menus("Menu Bar Demo");                                    m.resize(200,200);       m.show();             } } class Menus extends Frame {             Menus(String s)             {                         super(s);                         Me...
Post a Comment
Read more

Java question

  Java ques interview Ques:-List any five features of Java?  Ans :-Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded Ques . write full form of jdbc & odbc ?  Ans :-  JDBC -java database connectivity.             ODBC - open database connectivity Ques:- what are types of packages ? Ans: 1. Pre-defined packages 2. User defined packages Ques :-Define class?  Ans:- A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object. Ques:- Denfie string bulider? Ans :- Use StringBuilder whenever possible because it is faster than StringBuffer. But, if thread safety is necessary then use StringBuffer objects. Ques :- What is Singleton class?  Ans:Singleton class control object creation, limiting the number to one but allowing the flexibility to create m...
Post a Comment
Read more

MVC Example 1

                        Swing MVC Example in java Java Swing first programs In this chapter, we will program our first programs in Swing toolkit. The examples are going  to be very simple. We will cover some basic functionality. Our first example In our first example, we will show a basic window. import javax.swing.JFrame; public class Simple extends JFrame { public Simple() { setSize(300, 200); setTitle("Simple"); setDefaultCloseOperation(EXIT_ON_CLOSE); } public static void main(String[] args) { Simple simple = new Simple(); simple.setVisible(true); } } While this code is very small, the application window can do quite a lot. It can be resized, maximized, minimized. All the complexity that comes with it has been hidden from the application programmer. import javax.swing.JFrame; Here we import the JFrame widget. It is a toplevel container, which is used for plac...
Post a Comment
Read more