using menu concept

[kusuma]

Hi.....! this prg is sucessfully compiled b't the prb is after runing the prg am geting the follwing error as.....


Exception in thread main java .lang.noSuchMethod Error:main
please heip me out...advance thank u...:)



import java.applet.Applet;

import java.awt.Dimension;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;



/*

<applet code="MenuDemo" width=200 height=200>

*/

class MenuFrame extends Frame {

String msg = "";



MenuFrame(String title) {



MenuBar mbar = new MenuBar();

Menu Package = new Menu("Package");

MenuItem item1, item2;

Package.add(item1 = new MenuItem("Active"));

Package.add(item2 = new MenuItem("Passive"));

Menu sub1 = new Menu("Active");

MenuItem item3, item4, item5;

sub1.add(item3 = new MenuItem("Condutors"));

sub1.add(item4 = new MenuItem("inductors"));

sub1.add(item5 = new MenuItem("resistors"));

Package.add(sub1);

Menu sub2 = new Menu("Passive");

MenuItem item6, item7, item8, item9, item10;

sub2.add(item6 = new MenuItem("Digitalizers"));

sub2.add(item7 = new MenuItem("Analogic"));

sub2.add(item8 = new MenuItem("Transmittor"));

sub2.add(item9 = new MenuItem("MOSFET"));

sub2.add(item10 = new MenuItem("Diodes"));

Package.add(sub2);

Menu sub3 = new Menu("Resistors");

MenuItem item11, item12, item13, item14;

sub3.add(item11 = new MenuItem("DIP"));

sub3.add(item12 = new MenuItem("1206"));

sub3.add(item13 = new MenuItem("0805"));

sub3.add(item14 = new MenuItem("0603"));

Package.add(sub3);

MyMenuHandler handler = new MyMenuHandler(this);

item1.addActionListener(handler);

item2.addActionListener(handler);

item3.addActionListener(handler);

item4.addActionListener(handler);

item5.addActionListener(handler);

item6.addActionListener(handler);

item7.addActionListener(handler);

item8.addActionListener(handler);

item9.addActionListener(handler);

item10.addActionListener(handler);

item11.addActionListener(handler);

item12.addActionListener(handler);

item13.addActionListener(handler);

item14.addActionListener(handler);

MyWindowAdapter adapter = new MyWindowAdapter(this);

addWindowListener(adapter);

}



public void paint(Graphics g) {



}



class MyWindowAdapter extends WindowAdapter {

MenuFrame menuFrame;



public MyWindowAdapter(MenuFrame menuFrame) {

this.menuFrame = menuFrame;

}



public void windowclosing(WindowEvent we) {

menuFrame.setVisible(false);

}



}



class MyMenuHandler implements ActionListener, ItemListener {

MenuFrame menuFrame;



public MyMenuHandler(MenuFrame menuFrame) {

this.menuFrame = menuFrame;

}



public void actionPerformed(ActionEvent ae) {

String msg = "You selected";

String arg = ae.getActionCommand();

if (arg.equals("Active..."))

msg += "Active.";

else if (arg.equals("passive.."))

msg += "Passive.";

else if (arg.equals("conductors"))

msg += "conductors.";

else if (arg.equals("resistors"))

msg += "resistors.";

else if (arg.equals("inductors"))

msg += "inductors.";

else if (arg.equals("digitalizers"))

msg += "digitalizers.";

else if (arg.equals("Analogic"))

msg += "Analogic.";

else if (arg.equals("Transmitor"))

msg += "transimitor.";

else if (arg.equals("MOSFET"))

msg += "MOSFET.";

else if (arg.equals("diodes"))

msg += "diodes.";

else if (arg.equals("DIP"))

msg += "DIP.";

else if (arg.equals("1206"))

msg += "1206.";

else if (arg.equals("0805"))

msg += "0805.";

else if (arg.equals("0603"))

msg += "0603.";

}



public void itemStateChanged(ItemEvent ie) {

menuFrame.repaint();

}

}



public class MenuDemo extends Applet {

Frame f;



public void init() {

f = new MenuFrame("Menu Demo");

int width = Integer.parseInt(getParameter("Width"));

int height = Integer.parseInt(getParameter("height"));

setSize(new Dimension(width, height));

f.setSize(width, height);

f.setVisible(true);

}


public void start() {

f.setVisible(true);

}



public void stop() {

f.setVisible(false);

}

}

}

[Junky]

So does your class have a main method? Obviously not. So why doesn't it? Or why are you trying to run it if it doesn't?

[mine0926]

Welcome to the forum, please use code tags when posting code.

About your OP, it is stating that you are calling a method main that does not exist. Post the complete error message at the line it is referring.

[mine0926]

@Junky - I think this is an applet. Applet does not or should not have main method.

I could be wrong, correct me if I am wrong.

[Junky]

You could be right but OP is trying to run it like it was an app. Hence my second question above.