Layout Manager

for compile file "Javac SApplet.java" (working fine)

but,

java SApplet (not compile)

error message:
Exception in thread "main" java.lang.NoSuchMethodError:main


Please follow the program

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

public class SApplet extends Applet implements ActionListener {
  TextField input,output;
  Label label1,label2;
  Button b1;
  JLabel lbl;
  int num, sum = 0;
  public void init(){
  label1 = new Label("please enter number : ");
  add(label1);
  label1.setBackground(Color.yellow);
  label1.setForeground(Color.magenta);
  input = new TextField(5);
  add(input);
  label2 = new Label("Sum : ");
  add(label2);
  label2.setBackground(Color.yellow);
  label2.setForeground(Color.magenta);
  output = new TextField(20);
  add(output);
//  input.addActionListener( this );
  b1 = new Button("Add");
  add(b1);
  b1.addActionListener(this);
  lbl = new JLabel("This is the Swing Applet Example.  ");
  add(lbl);
  setBackground(Color.yellow);

//  output.addActionListener( this );
  }
  public void actionPerformed(ActionEvent ae){
  try{
//  num = Integer.parseInt(ae.getActionCommand());
  num = Integer.parseInt(input.getText());
  sum = sum+num;
  input.setText("");
  output.setText(Integer.toString(sum));
  lbl.setForeground(Color.blue);
  lbl.setText("Output of the second Text Box : " + output.getText());
  }
  catch(NumberFormatException e){
  lbl.setForeground(Color.red);
  lbl.setText("Invalid Entry!");
  }
  }
}

View Answers

March 2, 2012 at 12:09 PM

You are creating an applet. It doesn't have main method therefore you have got error.Applet always run on browser. You have to compile the applet class and run through the following html file that will call the applet on browser after compilation.

<HTML>
<BODY>
<APPLET CODE ="SApplet.class" WIDTH="800" HEIGHT="500"></APPLET>
</BODY>
</HTML>

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