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Choice class with button in java

        Choice class with button and label

 



import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
            <applet code="ListBox" height=200 width=200>
            </applet>
*/
public class ListBox extends Applet implements ActionListener
{
            Button b1,b2,b3;
            TextField tf;
            List lst;
            public void init()
            {
                        Label l1=new Label("List Box                      :");
                        add(l1);
                         lst=new List(5);
                        add(lst);
                        Label l2=new Label("Enter the Text :");
                        add(l2);
                        tf=new TextField(20);
                        add(tf);
                        b1=new Button("Add");
                        add(b1);
                        b1.addActionListener(this);
                        b2=new Button("Remove");
                        add(b2);
                        b2.addActionListener(this);
                        b3=new Button("Clear All");
                        add(b3);
                        b3.addActionListener(this);
            }
            public void actionPerformed(ActionEvent ae)
            {
                        if(ae.getSource()==b1)
                        {
                                    /* using the add button */
                                    String s=tf.getText();
                                    lst.add(s);
                        }
                        else
                        {
                                    if(ae.getSource()==b2)
                                    {
                                                /* using the remove button */
                                                if(lst.getSelectedIndex()!=-1)
                                                            lst.remove(lst.getSelectedIndex());
                                    }
                                    else
                                    {
                                                if(ae.getSource()==b3)
                                                {
                                                            /*using the clear all button */
                                                            lst.removeAll();
                                                }
                                    }
                        }
            }
}         

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