Advance JAVA Technology TUTORIAL:1 R.K.University

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Create a simple swing applet that demonstrate checkbox and radio button


           import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
<applet code="box" width=400 height=400>
                        </applet>
*/
public class box extends JApplet implements ItemListener
            {
                                    Container c;
                                    JLabel l1,l2;
JCheckBox c1,c2,c3;
                 JRadioButton r1,r2,r3;
                                    ButtonGroup bg;
public void init()
{
                                    c=this.getContentPane();
                                    c.setLayout(new FlowLayout());

            c1=new JCheckBox("Red");
                                     c.add(c1);
                             c2=new JCheckBox("Green");
                                     c.add(c2);
                                    c3=new JCheckBox("Blue");
                                     c.add(c3);       
                                     l1=new JLabel();
                                    c.add(l1);
c1.addItemListener(this);
                                     c2.addItemListener(this);
                                     c3.addItemListener(this);

                                     l2=new JLabel();
                                     c.add(l2);
                                     r1=new JRadioButton("Red");
                                     c.add(r1);
                                     r2=new JRadioButton("Green");
                                     c.add(r2);
                                     r3=new JRadioButton("Blue");
                                     c.add(r3);
                                     bg=new ButtonGroup();
                                     bg.add(r1);
                                     bg.add(r2);
                                     bg.add(r3);
                                    r1.addItemListener(this);
                                     r2.addItemListener(this);
                                     r3.addItemListener(this);
}
public void itemStateChanged(ItemEvent ie)
                         {
                                    if(ie.getSource()==c1)
                                    l1.setText("Red is marked");
                                    if(ie.getSource()==c2)
                                    l1.setText("Green is marked");
                                    if(ie.getSource()==c3)
                                    l1.setText("Blue is marked");
                                    if(ie.getSource()==r1)
                                    l2.setText("Red is marked");
                                    if(ie.getSource()==r2)
                                    l2.setText("Green is marked");
                                    if(ie.getSource()==r3)
                                    l2.setText("Blue is marked");
                         }

        }

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Create swing applet that contain text field, password field and command button


          import java.applet.Applet;
          import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/*
<applet code="login" width=200 height=200>
                        </applet>
*/
public class login extends JApplet  
            {
                        Container c;
                        JLabel j1,j2;
                        JTextField t1,t2,t3;
                        JPasswordField p1;
                        JButton b1,b2;
            public void init()
{
                        c=this.getContentPane();
                        c.setLayout(new GridLayout(4,1));
                        j1=new JLabel("user name:");
                        c.add(j1);
t2=new JTextField();
                        c.add(t2);
j2=new JLabel("Password:");
                        c.add(j2);
p1=new JPasswordField();
                        c.add(p1);
b1=new JButton("OK");
                        c.add(b1);

                        b2=new JButton("Cancel");
                        c.add(b2);
        }

  }

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Create a simple swing frame


import javax.swing.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

    public class ws extends JFrame
    {
         Container c;
         public ws(String title)
          {
               super("Frame");
               c=this.getContentPane();
               c.setBackground(Color.pink);
               setSize(300,400);
               addWindowListener(new f1());
               setDefaultCloseOperation(DISPOSE_ON_CLOSE);
               show();
          }
        class f1 extends WindowAdapter
          {
                 public void windowClosed(WindowEvent e)
                        {
                                 System.exit(0);
                        }
          }
                public static void main(String args[])
                        {
                                  ws w=new ws("frame 1");
                        }        
}

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Create a simple swing applet


            import java.awt.*;
            import java.applet.*;
            import java.awt.event.*;
            import javax.swing.*;

            /*
                 <applet code="sw" height=300 width=300>
                 </applet>
            */

              public class sw extends JApplet
              {
                   JLabel l1;
                   Container c;
                        public void init()
                         {
                                      c=this.getContentPane();
                                      l1=new JLabel("this is label");
                                     c.add(l1);
                         }           
              }
 

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