i need urgent help. this error cmoing. i dont know what to do

Question

lich -11 Junior Poster in Training

15 Years Ago

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

public class hashedited extends Applet implements ItemListener
{
    CheckboxGroup cbg;
    //CheckboxGroup type1,type2;
    //CheckboxGroup cbg1;
    //CheckboxGroup size1, size2;
    
    private TextField amtpaid;
    private Button cancel;
    private Label cost;
    private Choice flavour;
    private Label flavours;
    private Label name;
    private Button ok;
    private Label paid;
    private Panel panel1;
    private Panel panel2;
    private Panel panel3;
    private Button price1;
    private Button price2;
    private Button price3;
    private Button price4;
    private Button price5;
    private Button price6;
    private Button price7;
    private Checkbox size1;
    private Checkbox size2;
    private Label sizename;
    private Button soda;
    private TextField totcost;
    private Checkbox type1;
    private Checkbox type2;
    private Label typename;
    
    /** Initializes the applet project */
    public void init()
        	{
    		System.out.println("tedt");
    		    		
    		cbg= new CheckboxGroup();
    		

        name = new Label();
        ok = new Button();
        cancel = new Button();
        panel1 = new Panel();
        type1 = new Checkbox();
        type2 = new Checkbox();
        size1 = new Checkbox();
        size2 = new Checkbox();
        typename = new Label();
        sizename = new Label();
        flavours = new Label();
        flavour = new Choice();
        panel2 = new Panel();
        price1 = new Button();
        price2 = new Button();
        price3 = new Button();
        price4 = new Button();
        price5 = new Button();
        price6 = new Button();
        price7 = new Button();
        panel3 = new Panel();
        cost = new Label();
        totcost = new TextField();
        paid = new Label();
        amtpaid = new TextField();
        soda = new Button();

        setBackground(new Color(0, 105, 0));
        setLayout(null);

        name.setAlignment(Label.CENTER);
        name.setBackground(new Color(204, 255, 204));
        name.setFont(new Font("Algerian", 3, 24));
        name.setForeground(new Color(0, 0, 0));
        name.setText("TaStY SoDa");
        add(name);
        name.setBounds(20, 10, 630, 40);
        name.getAccessibleContext().setAccessibleName("TaStY SoDa");

        ok.setBackground(new Color(153, 255, 153));
        ok.setFont(new Font("Arial", 3, 12));
        ok.setLabel("OK");
        add(ok);
        ok.setBounds(140, 250, 80, 23);

        cancel.setBackground(new Color(153, 255, 153));
        cancel.setFont(new Font("Arial", 3, 12));
        cancel.setLabel("CANCEL");
        add(cancel);
        cancel.setBounds(262, 250, 80, 23);

        panel1.setBackground(new Color(204, 255, 204));
        panel1.setLayout(null);
		
		//cbg = new CheckboxGroup();
        type1.setFont(new Font("Century Gothic", 1, 14));
        type1 = new Checkbox("Regular",cbg,true);
        panel1.add(type1);
        type1.setBounds(130, 70, 90, 23);
        //type1.addItemListener(this);
		
		//cbg = new CheckboxGroup();
        type2.setFont(new Font("Century Gothic", 1, 14));
        type2= new Checkbox("Diet",cbg,false);
        panel1.add(type2);
        type2.setBounds(280, 70, 53, 23);
        //type2.addItemListener(this);
		
		type1.addItemListener(this);
		type2.addItemListener(this);
		
		type1.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent evt) {
                type1ItemStateChanged(evt);
            }
        });
        
        type2.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent evt) {
                type2ItemStateChanged(evt);
            }
        });
		//cbg1 = new CheckboxGroup();
        size1.setFont(new Font("Century Gothic", 1, 14));
        size1.setLabel("10 oz - (1.60 $)");
        panel1.add(size1);
        size1.setBounds(130, 110, 125, 23);
        //size1.addItemListener(this);
		
		//cbg1 = new CheckboxGroup();
        size2.setFont(new Font("Century Gothic", 1, 14));
        size2.setLabel("16 oz - (2.00 $)");
        panel1.add(size2);
        size2.setBounds(280, 110, 125, 23);
        //size2.addItemListener(this);

        typename.setAlignment(Label.CENTER);
        typename.setBackground(new Color(153, 255, 153));
        typename.setFont(new Font("Dialog", 1, 13));
        typename.setText("Type");
        panel1.add(typename);
        typename.setBounds(10, 70, 70, 22);

        sizename.setAlignment(Label.CENTER);
        sizename.setBackground(new Color(153, 255, 153));
        sizename.setFont(new Font("Dialog", 1, 13));
        sizename.setText("Size");
        panel1.add(sizename);
        sizename.setBounds(10, 110, 70, 22);

        flavours.setAlignment(Label.CENTER);
        flavours.setBackground(new Color(153, 255, 153));
        flavours.setFont(new Font("Arial", 1, 13));
        flavours.setForeground(new Color(0, 51, 51));
        flavours.setText("Flavours");
        panel1.add(flavours);
        flavours.setBounds(10, 20, 70, 19);

        flavour.add("Cola");
        flavour.add("Orange");
        flavour.add("Lime");
        flavour.setFont(new Font("Candara", 0, 12));
        panel1.add(flavour);
        flavour.setBounds(130, 20, 180, 19);

        add(panel1);
        panel1.setBounds(20, 80, 430, 150);

        panel2.setBackground(new Color(204, 255, 204));
        panel2.setLayout(null);

        price1.setBackground(new Color(153, 153, 0));
        price1.setFont(new Font("Dialog", 1, 12));
        price1.setLabel("10 cents");
        panel2.add(price1);
        price1.setBounds(40, 20, 70, 24);

        price2.setBackground(new Color(153, 153, 0));
        price2.setFont(new Font("Dialog", 1, 12));
        price2.setLabel("20 cents");
        panel2.add(price2);
        price2.setBounds(40, 60, 70, 24);

        price3.setBackground(new Color(153, 153, 0));
        price3.setFont(new Font("Dialog", 1, 12));
        price3.setLabel("50 cents");
        panel2.add(price3);
        price3.setBounds(40, 100, 70, 24);

        price4.setBackground(new Color(153, 153, 0));
        price4.setFont(new Font("Dialog", 1, 12));
        price4.setLabel("1.00 $");
        panel2.add(price4);
        price4.setBounds(40, 140, 70, 24);

        price5.setBackground(new Color(153, 153, 0));
        price5.setFont(new Font("Dialog", 1, 12));
        price5.setLabel("2.00 $");
        panel2.add(price5);
        price5.setBounds(40, 180, 70, 24);

        price6.setBackground(new Color(153, 153, 0));
        price6.setFont(new Font("Dialog", 1, 12));
        price6.setLabel("5.00 $");
        panel2.add(price6);
        price6.setBounds(40, 220, 70, 24);

        price7.setBackground(new Color(153, 153, 0));
        price7.setFont(new Font("Dialog", 1, 12));
        price7.setLabel("10.00 $");
        panel2.add(price7);
        price7.setBounds(40, 260, 70, 24);

        add(panel2);
        panel2.setBounds(500, 100, 150, 300);

        panel3.setBackground(new Color(204, 255, 204));
        panel3.setLayout(null);

        cost.setAlignment(Label.CENTER);
        cost.setBackground(new Color(153, 255, 153));
        cost.setFont(new Font("Dialog", 1, 13));
        cost.setText("Total Cost");
        panel3.add(cost);
        cost.setBounds(10, 30, 80, 22);

        totcost.setBackground(new Color(255, 255, 255));
        panel3.add(totcost);
        totcost.setBounds(150, 30, 120, 20);

        paid.setAlignment(Label.CENTER);
        paid.setBackground(new Color(153, 255, 153));
        paid.setFont(new Font("Dialog", 1, 13));
        paid.setText("Amount Paid");
        panel3.add(paid);
        paid.setBounds(10, 70, 90, 22);
        panel3.add(amtpaid);
        amtpaid.setBounds(150, 70, 120, 20);

        add(panel3);
        panel3.setBounds(70, 310, 330, 110);

        soda.setBackground(new Color(153, 255, 153));
        soda.setFont(new Font("Arial", 3, 14));
        soda.setLabel("Take Soda and change");
        
        soda.addActionListener(new ActionListener() 
        	{
            public void actionPerformed(ActionEvent evt) 
            	{
                sodaActionPerformed(evt);
            	}
        	});
        add(soda);
        soda.setBounds(130, 450, 210, 25);
    }// </editor-fold>

    private void sodaActionPerformed(ActionEvent evt) 
    	{
        // TODO add your handling code here:
/*   			if (flavour = "Lime")
   			{
   				type2.setVisible(false);
   			}
   			
   			else  
   			{
   				type2.setVisible(true);
   			}*/
   				System.out.println("test");	
   		}
   		private void type1ItemStateChanged(ItemEvent evt)
   		{
   		
   			System.out.println("test");	
   		}
   		
   			private void type2ItemStateChanged(ItemEvent evt)
   		{
   		
   			System.out.println("test2");	
   		}
   	
        public void actionPerformed(ActionEvent evt)
        {
        	repaint();
        }
        public void paint(Graphics g) 
             	{
             		System.out.println("test");
        	
    
}

C:\Documents and Settings\Lich™\Desktop\hashedited.java:5: hashedited is not abstract and does not override abstract method itemStateChanged(java.awt.event.ItemEvent) in java.awt.event.ItemListener
public class hashedited extends Applet implements ItemListener

java

4 Contributors
4 Replies
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2 Days Discussion Span
Latest Post 15 Years Ago Latest Post by vigneswara

Salem commented: 48 posts, and still puking lots of code without code tags - ignore until further notice. -4

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VernonDozier 2,218 Posting Expert

15 Years Ago

Anytime you implement any type of Listener in Java, you need to implement at least one function. With ActionListener, it's "actionPerformed". With ItemListener, it's "itemStateChanged". Always type in "ItemListener", or whatever Listener you are using, into google, find a link that takes you to a Java documentation page, then scroll down to the "Method Summary" portion of the page. Make sure you have those functions in your program, even if they are empty.

http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/ItemListener.html#itemStateChanged(java.awt.event.ItemEvent)

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lich -11 Junior Poster in Training · Answer 1 · 2008-08-10T07:10:50+00:00

Anytime you implement any type of Listener in Java, you need to implement at least one function. With ActionListener, it's "actionPerformed". With ItemListener, it's "itemStateChanged". Always type in "ItemListener", or whatever Listener you are using, into google, find a link that takes you to a Java documentation page, then scroll down to the "Method Summary" portion of the page. Make sure you have those functions in your program, even if they are empty.
http://java.sun.com/j2se/1.5.0/docs/api/java/awt/event/ItemListener.html#itemStateChanged(java.awt.event.ItemEvent)

but i have put that two rite.. its there... :(

sciwizeh 62 Posting Pro in Training · Answer 2 · 2008-08-10T07:50:07+00:00

take out ItemListener in your class statement and take out the .addItemListener(this) call,

the reason is that you are making an abstract item listener with the second set of calls to addItemListener, and your class isn't acting as the listener at all

vigneswara 0 Newbie Poster · Answer 3 · 2008-08-12T11:08:42+00:00

ItemListener is an interface
u r class is implemented with ItemListener
once u implement the Listeners u must define the abstract methods
just declare those abstract methods
without define the abstract methods u got an error

i need urgent help. this error cmoing. i dont know what to do

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