Solved: how to delete a item in list?

ASKER

Edited text of question.

r u working with java.awt.List?

what u can do is,

under the delete actionlistener,

//
int[] indexes=listA.getSelectedIndexes();
for(int i=0;i<indexes.length;i++){
listA.remove(indexes[i]);
listB.remove(indexes[i]);
}

//

-sgoms

amitd

HELLO
do the 2 list has same items?
i assume that both has samle item:)
then code is

public class TList extends Frame implements ActionListener
{public int i;
      private Button b;
      private List l,m;
      public TList()
      {
            setSize(300,300);
            Panel f = new Panel();
f.setLayout(new BorderLayout());
b = new Button("Delete");
b.addActionListener(this);
f.add(BorderLayout.SOUTH,b);
l = new List();
m = new List();
l.add("abc");
l.add("xyz");
l.addMouseListener(new Mous());
            m.add("mmm");
            m.add("nnn");
f.add(BorderLayout.CENTER,l);

f.add(BorderLayout.NORTH,m);
f.setVisible(true);
add(f);

}
public void actionPerformed(ActionEvent e)
{
      l.remove(i);
      m.remove(i);
      }
private class Mous extends MouseAdapter
      {

public void mouseClicked( MouseEvent e )
{
i = l.getSelectedIndex();
l.remove(i);
m.remove(i);
}
}

public static void main(String args[])
{
TList t = new TList();
t.setVisible(true);

}
}

sgoms

instead of actionlistener & mouselistener ..add the specified listener for List.

//create list1, list2 & add items to it

list1.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e){
int[] indexes=list1.getSelectedIndexes();
for(int i=0;i<indexes.length;i++){
//select the corresponding item in list2
list2.select(indexes[i]);
//remove items
list1.remove(indexes[i]);
list2.remove(indexes[i]);
}
}
};

//

-sgoms

amitd

hey sgoms & what if u want to select it using mouse

sgoms

when u select it with a mouse the itemstate changes from being not selected to selected so an event will be triggered & u can capture that using ItemListnener.

amitd

ok sgoms i got it
thanks

bhuey_ling

ASKER

hello...

thanks for help ......

sgoms,
well below is my program that had been add ur code:

but got 1 error:

error:
1.Pulse_2.java:128: Type expected.
      listInput.addItemListener(new ItemListener(){

program:
import java.awt.*;
import java.applet.*;

public class Pulse_2 extends Applet
{
      Scrollbar sred;
      Button btnReset, btnDraw, btnSave;
      TextField txtInputVal, txtOutputVal, txtXY;
      Label lblRed, lblOutput, lblInput, lblInputVal, lblOutputVal;
      DisplayCanvas intensityDisplay;
      List listInput, listOutput;
      String INPUT[]= new String [20];
      String OUTPUT[]= new String [20];


      public void init(){

            listInput=new List(15, true);
            listOutput=new List(15, true);

            txtInputVal = new TextField("5.000",3);
            txtOutputVal = new TextField("4.886",3);
            txtXY = new TextField("X,Y",6);
            btnReset = new Button("Reset");
            btnSave = new Button("Save Data");
            btnDraw = new Button("Draw Graph");
            lblRed = new Label("Potentiometer");
            lblOutput = new Label("Output Voltage");
            lblInput = new Label("Input Voltage");
            lblInputVal = new Label("Input Voltage");
            lblOutputVal = new Label("Output Voltage");
            sred = new Scrollbar(Scrollbar.HORIZONTAL, 255, 0, 0, 255);

            intensityDisplay = new DisplayCanvas();
//        graphDisplay = new graphCanvas();
       intensityDisplay.setBackground(Color.lightGray);
//        graphDisplay.setBackground(Color.black);

            GridBagLayout gbLayout = new GridBagLayout();
            setLayout(gbLayout);

            GridBagConstraints gbConstraints = new GridBagConstraints();

            gbConstraints.fill = GridBagConstraints.NONE;
            gbConstraints.anchor = GridBagConstraints.WEST;
            gbConstraints.weightx = 10;
            gbConstraints.weighty =10;
            add(lblRed, gbLayout, gbConstraints, 3, 3, 1, 1);

            gbConstraints.fill = GridBagConstraints.BOTH;
            gbConstraints.weightx = 150;
            add(intensityDisplay, gbLayout, gbConstraints, 0, 0, 3, 7);
//            add(graphDisplay, gbLayout, gbConstraints, 3, 0, 1, 7);

            gbConstraints.fill = GridBagConstraints.NONE;
            gbConstraints.weightx = 10;
            add(listInput, gbLayout, gbConstraints, 5, 1, 1, 7);
            add(listOutput, gbLayout, gbConstraints, 6, 1, 1, 7);

            gbConstraints.fill = GridBagConstraints.HORIZONTAL;
            gbConstraints.anchor = GridBagConstraints.CENTER;
            gbConstraints.weightx = 10;
            add(sred, gbLayout, gbConstraints, 3, 4, 2, 1);

            gbConstraints.anchor = GridBagConstraints.WEST;
            add(lblInput, gbLayout, gbConstraints, 3, 0, 1, 1);
            add(txtInputVal, gbLayout, gbConstraints, 4, 0, 1, 1);
            add(lblOutput, gbLayout, gbConstraints, 3, 1, 1, 1);
            add(txtOutputVal, gbLayout, gbConstraints, 4, 1, 1, 1);
            add(txtXY, gbLayout, gbConstraints, 3,5,1,1);
            add(btnReset, gbLayout, gbConstraints,4,5,1,1);
            add(btnDraw, gbLayout, gbConstraints,5,8,1,1);
            add(btnSave, gbLayout, gbConstraints,4,2,1,1);
            add(lblInputVal, gbLayout, gbConstraints,5,0,1,1);
            add(lblOutputVal, gbLayout, gbConstraints,6,0,1,1);
//            graphDisplay.repaint();

      }

      private void add(Component component, GridBagLayout layout,
            GridBagConstraints constraints, int x, int y, int w, int h)
      {
            constraints.gridx = x;
            constraints.gridy = y;
            constraints.gridwidth = w;
            constraints.gridheight = h;
            layout.setConstraints(component, constraints);
            add(component);
      }


      public boolean handleEvent(Event evt){
            if(evt.target instanceof Scrollbar){
            double ipVolt = InputVolt(sred.getValue());
            OutputVolt(ipVolt);
            return true;
            }
            return super.handleEvent(evt);
      }
      public boolean action(Event ev, Object arg){
            //most commponents generate ACTION_EVENT
            //we must test the target field to find out which component
            if(ev.target instanceof TextField){
                        String label = (String)arg;
                        float value;
                        value=Float.valueOf(label).floatValue();
                        if(ev.target==txtInputVal)
                        textInput(1,value);
                        if(ev.target==txtOutputVal)
                        textInput(2,value);
            }

                  else if(ev.target instanceof Button){
                        String label =(String)arg;
                        if(label.equals ("Reset"))reset();
                        else if(label.equals("Save Data")){
                              listInput.addItem(""+txtInputVal.getText()+"V");
                              listOutput.addItem(""+txtOutputVal.getText()+"V");
                        }
                        else if(label.equals("Draw Graph")){
                              Frame f= new Frame();
                              f.show();
                              }
                  }
            return true;
      }

//ur code

      listInput.addItemListener(new ItemListener(){
           public void itemStateChanged(ItemEvent e){
                  int[] indexes=listInput.getSelectedIndexes();
                  for(int i=0;i<indexes.length;i++){
           //select the corresponding item in list2
           listOutput.select(indexes[i]);
             //remove items
           listInput.remove(indexes[i]);
           listOutput.remove(indexes[i]);
            }
           }
      };

//ur code end

      public boolean mouseMove(Event e, int x, int y){
            writeXY(x,y);
            return true;
      }

      public boolean mouseExit(Event e, int x, int y){
            txtXY.setText("X,Y");
            return true;
      }

      private void writeXY(int x, int y){
            txtXY.setText(""+Integer.toString(x)+","+
                  Integer.toString(y));

      }

      boolean inrange, normal;
      public void textInput(int type, double value){
            double Input;
            switch (type){
            case 1: //Input
                  condition1(value);
                  if(inrange){
                        int val=(int)(value/5*255);
                        sred.setValue(val);
                        OutputVolt(value);
                  }
                  break;
            case 2: //output
                  condition2(value);
                  if(normal){
                        Input=test(value);
                        int val=(int)(Input/5*255);
                        sred.setValue(val);
                        writeText(txtInputVal,Input);
                        OutputVolt(Input);
                  }
                  break;
            }
      }

      private double InputVolt (int ipVal)
      {
            double Val = (double)ipVal/255*5;
            writeText(txtInputVal,Val);
            return Val;

      }

      public void reset(){
            writeText(txtInputVal,5.000);
            writeText(txtOutputVal,4.886);
            intensityDisplay.setForeground(Color.red);
//            graphDisplay.setXY(5.,5.);
            sred.setValue(255);
            on=true;
      }

      boolean on, temp1=true;
      double temp=4.84;
      private void OutputVolt(double inputVal)
      {
            double current=(double)inputVal-0.114;
            if(current>=0.144)
            writeText(txtOutputVal,current);
            else writeText(txtOutputVal,0.);

            if(current>=4.84)
            {
                  intensityDisplay.setForeground(Color.red);
                  intensityDisplay.repaint();
//                  graphDisplay.setXY(inputVal,5.);
                  on=true;
            }

            else
            {
                  double previous=temp ;
                  boolean red=temp1;
                  if(current>previous){
                        if(red){
                              intensityDisplay.setForeground(Color.red);
                              intensityDisplay.repaint();
//                              graphDisplay.setXY(inputVal,5.);
                              on=true;
                        }

                        else{
                              if(current>=3.078){
                                    intensityDisplay.setForeground(Color.red);
                                    intensityDisplay.repaint();
//                                    graphDisplay.setXY(inputVal,5.);
                                    on=true;
                              }


                              else{
                                    intensityDisplay.setForeground(Color.black);
                                    intensityDisplay.repaint();
//                                    graphDisplay.setXY(inputVal,0.);
                                    on=false;
                              }
                        }
                  }

                  else{
                        if(red){
                              if(current>=1.913){
                                    intensityDisplay.setForeground(Color.red);
                                    intensityDisplay.repaint();
//                                    graphDisplay.setXY(inputVal,5.);
                                    on=true;
                              }
                              else{
                                    intensityDisplay.setForeground(Color.black);
                                    intensityDisplay.repaint();
//                                    graphDisplay.setXY(inputVal,0.);
                                    on=false;
                              }
                        }

                        else{
                              intensityDisplay.setForeground(Color.black);
                              intensityDisplay.repaint();
//                              graphDisplay.setXY(inputVal,0.);
                              on=false;
                        }
                  }
            }

            temp=(double)inputVal-0.114;
            temp1=on;
      }

      public void condition1(double value1){
            if (value1>=0 && value1<=5)
            inrange=true;
            else{
                  inrange=false;
                  Frame f=new Frame("InfoDialog Test");
                  f.resize(100,100);
                  InfoDialog dlg=new InfoDialog(f,"Danger!",
                          " Invalid Input Voltage.Try Again!");
                  dlg.show();
                  reset();
            }
      }

      public void condition2(double value2){
            if (value2>=0 && value2<4.98)
            normal=true;
            else{
                  normal=false;
                  Frame f=new Frame("InfoDialog Test");
                  f.resize(100,100);
                  InfoDialog dlg=new InfoDialog(f,"Danger!",
                          " Invalid Output Voltage.Try Again!");
                  dlg.show();
                  reset();
            }
      }

      private double test(double value){
            double input;
            if (value < 4.886)
            input=value + 0.114;
            else input=5.000;
            return input;
      }

      private void writeText(TextField obj, double value){
            value=(double)((int)(1000.*value)/1000.);
            obj.setText(Double.toString(value));
      }

      class InfoDialog extends Dialog{
      protected Button button;
      protected Label label;

            public InfoDialog(Frame parent, String title,String message){
                  super(parent, title, true);

                  this.setLayout(new BorderLayout(15,15));

                  Panel p1=new Panel();
                  p1.setLayout(new FlowLayout(FlowLayout.CENTER,15,15));
                  p1.add(label=new Label(message));
                  this.add("North",p1 );

                  button=new Button("Okay");
                  Panel p2=new Panel();
                  p2.setLayout(new FlowLayout(FlowLayout.CENTER, 15, 15));
                  p2.add(button);
                  this.add("South",p2);
                  this.pack();
            }

            public boolean action(Event e, Object arg){
                  if(e.target==button){
                        this.hide();
                        this.dispose();
                        return true;
                  }
                  else return false;
            }

            public boolean gotFocus(Event e, Object arg){
                  button.requestFocus();
                  return true;
            }
      }

      class DisplayCanvas extends Canvas{
            public DisplayCanvas(){
                  setColor(Color.red);
            }

            public void setColor(Color colour){
                  setForeground(colour);
                  repaint();
              }

            public void paint(Graphics g){
                  g.fillOval(10,20,130,130);
                  g.fillOval(40,200,80,80);
                  g.setColor(Color.blue);
                  g.setFont(new Font("Helvetica", Font.BOLD,12));
                  g.drawString("LED",70,190);
                  g.drawString("Fiber-optic",60,310);
       }
      }

//      class graphCanvas extends Canvas{
//            double xg, yg;
//            public graphCanvas(){
//                  setXY(5.,4.89);
//            }

//            public void setXY(double xd, double yd){
//                  xg=xd;
//                  yg=yd;
//                  repaint();
//            }

//            public void paint(Graphics g){
//                  int col, colMax, row;
//                  colMax = (int)(260-(4.870/5*200));
//                  g.setColor(Color.green);
//                  g.drawLine(10,260,210,260);
//                  g.drawLine(10,60,10,260);
//
//                  for(int i=10;i<=210;i+=20)
//                  g.drawLine(i,258,i,262);
//                  for(int i=60;i<=260;i+=20)
//                  g.drawLine(8,i,12,i);

//                  g.setColor(Color.white);
//                  g.drawLine(10,260,139,260); //draw graph
//                  g.drawLine(90,60,210,60);
//                  g.drawLine(90,60,90,260);
//                  g.drawLine(139,60,139,260);
//                  g.drawString("0",10,275);
//                  g.drawString("5",205,275);
//                  g.drawString("INPUT(V)",160,290);
//                  g.drawString("5",10,55);
//                  g.drawString("OUTPUT(V)",10,35);

//                  row=(int)(xg/5*210);
//                  col=(int)(260-(yg/5*200));
//                  g.setColor(Color.yellow);
//                  if(row+5>=210)
//                  g.fillOval(210,col-5,5,5);
//                  else g.fillOval(row+5, col-3,5,5);
//                  }
//            }

//      class graphFrame extends Frame{
//
//            graphCanvas graphDisplay;
//            graphDisplay = new graphCanvas();
//             graphDisplay.setBackground(Color.black);

//             GridBagLayout gbLayout = new GridBagLayout();
//            setLayout(gbLayout);
//            GridBagConstraints gbConstraints = new GridBagConstraints();
//            gbConstraints.fill = GridBagConstraints.BOTH;
//            gbConstraints.weightx = 150;
//            add(graphDisplay, gbLayout, gbConstraints, 0, 0, 1, 7);
//            }

      public Insets insets(){
            return new Insets(10, 10, 10, 10);
      }
}


thanx

rgds
hl

sgoms

When you add a Listener using
....addXXXListener(new XXXListener(){
});

you r using an anonymous class declaration. instead of having a class that implements XXXListener & tehn using a instance of that class you declare the class there itself. this needs to be stated inside a method & not outside it.

The following program will compile.
      import java.awt.*;
      import java.applet.*;
      import java.awt.event.*;

      public class Pulse_2 extends Applet
      {
      Scrollbar sred;
      Button btnReset, btnDraw, btnSave;
      TextField txtInputVal, txtOutputVal, txtXY;
      Label lblRed, lblOutput, lblInput, lblInputVal, lblOutputVal;
      DisplayCanvas intensityDisplay;
      List listInput, listOutput;
      String INPUT[]= new String [20];
      String OUTPUT[]= new String [20];


      public void init(){

      listInput=new List(15, true);
      listOutput=new List(15, true);
      listInput.addItemListener(new ItemListener(){
       public void itemStateChanged(ItemEvent e){
       int[] indexes=listInput.getSelectedIndexes();
       for(int i=0;i<indexes.length;i++){
       //select the corresponding item in list2
       listOutput.select(indexes[i]);
       //remove items
       listInput.remove(indexes[i]);
       listOutput.remove(indexes[i]);
       }
       }
      });
      txtInputVal = new TextField("5.000",3);
      txtOutputVal = new TextField("4.886",3);
      txtXY = new TextField("X,Y",6);
      btnReset = new Button("Reset");
      btnSave = new Button("Save Data");
      btnDraw = new Button("Draw Graph");
      lblRed = new Label("Potentiometer");
      lblOutput = new Label("Output Voltage");
      lblInput = new Label("Input Voltage");
      lblInputVal = new Label("Input Voltage");
      lblOutputVal = new Label("Output Voltage");
      sred = new Scrollbar(Scrollbar.HORIZONTAL, 255, 0, 0, 255);

      intensityDisplay = new DisplayCanvas();
      // graphDisplay = new graphCanvas();
       intensityDisplay.setBackground(Color.lightGray);
      // graphDisplay.setBackground(Color.black);

      GridBagLayout gbLayout = new GridBagLayout();
      setLayout(gbLayout);

      GridBagConstraints gbConstraints = new GridBagConstraints();

      gbConstraints.fill = GridBagConstraints.NONE;
      gbConstraints.anchor = GridBagConstraints.WEST;
      gbConstraints.weightx = 10;
      gbConstraints.weighty =10;
      add(lblRed, gbLayout, gbConstraints, 3, 3, 1, 1);

      gbConstraints.fill = GridBagConstraints.BOTH;
      gbConstraints.weightx = 150;
      add(intensityDisplay, gbLayout, gbConstraints, 0, 0, 3, 7);
      // add(graphDisplay, gbLayout, gbConstraints, 3, 0, 1, 7);

      gbConstraints.fill = GridBagConstraints.NONE;
      gbConstraints.weightx = 10;
      add(listInput, gbLayout, gbConstraints, 5, 1, 1, 7);
      add(listOutput, gbLayout, gbConstraints, 6, 1, 1, 7);

      gbConstraints.fill = GridBagConstraints.HORIZONTAL;
      gbConstraints.anchor = GridBagConstraints.CENTER;
      gbConstraints.weightx = 10;
      add(sred, gbLayout, gbConstraints, 3, 4, 2, 1);

      gbConstraints.anchor = GridBagConstraints.WEST;
      add(lblInput, gbLayout, gbConstraints, 3, 0, 1, 1);
      add(txtInputVal, gbLayout, gbConstraints, 4, 0, 1, 1);
      add(lblOutput, gbLayout, gbConstraints, 3, 1, 1, 1);
      add(txtOutputVal, gbLayout, gbConstraints, 4, 1, 1, 1);
      add(txtXY, gbLayout, gbConstraints, 3,5,1,1);
      add(btnReset, gbLayout, gbConstraints,4,5,1,1);
      add(btnDraw, gbLayout, gbConstraints,5,8,1,1);
      add(btnSave, gbLayout, gbConstraints,4,2,1,1);
      add(lblInputVal, gbLayout, gbConstraints,5,0,1,1);
      add(lblOutputVal, gbLayout, gbConstraints,6,0,1,1);
      // graphDisplay.repaint();

      }

      private void add(Component component, GridBagLayout layout,
      GridBagConstraints constraints, int x, int y, int w, int h)
      {
      constraints.gridx = x;
      constraints.gridy = y;
      constraints.gridwidth = w;
      constraints.gridheight = h;
      layout.setConstraints(component, constraints);
      add(component);
      }


      public boolean handleEvent(Event evt){
      if(evt.target instanceof Scrollbar){
      double ipVolt = InputVolt(sred.getValue());
      OutputVolt(ipVolt);
      return true;
      }
      return super.handleEvent(evt);
      }
      public boolean action(Event ev, Object arg){
      //most commponents generate ACTION_EVENT
      //we must test the target field to find out which component
      if(ev.target instanceof TextField){
      String label = (String)arg;
      float value;
      value=Float.valueOf(label).floatValue();
      if(ev.target==txtInputVal)
      textInput(1,value);
      if(ev.target==txtOutputVal)
      textInput(2,value);
      }

      else if(ev.target instanceof Button){
      String label =(String)arg;
      if(label.equals ("Reset"))reset();
      else if(label.equals("Save Data")){
      listInput.addItem(""+txtInputVal.getText()+"V");
      listOutput.addItem(""+txtOutputVal.getText()+"V");
      }
      else if(label.equals("Draw Graph")){
      Frame f= new Frame();
      f.show();
      }
      }
      return true;
      }

      public boolean mouseMove(Event e, int x, int y){
      writeXY(x,y);
      return true;
      }

      public boolean mouseExit(Event e, int x, int y){
      txtXY.setText("X,Y");
      return true;
      }

      private void writeXY(int x, int y){
      txtXY.setText(""+Integer.toString(x)+","+
      Integer.toString(y));

      }

      boolean inrange, normal;
      public void textInput(int type, double value){
      double Input;
      switch (type){
      case 1: //Input
      condition1(value);
      if(inrange){
      int val=(int)(value/5*255);
      sred.setValue(val);
      OutputVolt(value);
      }
      break;
      case 2: //output
      condition2(value);
      if(normal){
      Input=test(value);
      int val=(int)(Input/5*255);
      sred.setValue(val);
      writeText(txtInputVal,Input);
      OutputVolt(Input);
      }
      break;
      }
      }

      private double InputVolt (int ipVal)
      {
      double Val = (double)ipVal/255*5;
      writeText(txtInputVal,Val);
      return Val;

      }

      public void reset(){
      writeText(txtInputVal,5.000);
      writeText(txtOutputVal,4.886);
      intensityDisplay.setForeground(Color.red);
      // graphDisplay.setXY(5.,5.);
      sred.setValue(255);
      on=true;
      }

      boolean on, temp1=true;
      double temp=4.84;
      private void OutputVolt(double inputVal)
      {
      double current=(double)inputVal-0.114;
      if(current>=0.144)
      writeText(txtOutputVal,current);
      else writeText(txtOutputVal,0.);

      if(current>=4.84)
      {
      intensityDisplay.setForeground(Color.red);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,5.);
      on=true;
      }

      else
      {
      double previous=temp ;
      boolean red=temp1;
      if(current>previous){
      if(red){
      intensityDisplay.setForeground(Color.red);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,5.);
      on=true;
      }

      else{
      if(current>=3.078){
      intensityDisplay.setForeground(Color.red);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,5.);
      on=true;
      }


      else{
      intensityDisplay.setForeground(Color.black);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,0.);
      on=false;
      }
      }
      }

      else{
      if(red){
      if(current>=1.913){
      intensityDisplay.setForeground(Color.red);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,5.);
      on=true;
      }
      else{
      intensityDisplay.setForeground(Color.black);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,0.);
      on=false;
      }
      }

      else{
      intensityDisplay.setForeground(Color.black);
      intensityDisplay.repaint();
      // graphDisplay.setXY(inputVal,0.);
      on=false;
      }
      }
      }

      temp=(double)inputVal-0.114;
      temp1=on;
      }

      public void condition1(double value1){
      if (value1>=0 && value1<=5)
      inrange=true;
      else{
      inrange=false;
      Frame f=new Frame("InfoDialog Test");
      f.resize(100,100);
      InfoDialog dlg=new InfoDialog(f,"Danger!",
       " Invalid Input Voltage.Try Again!");
      dlg.show();
      reset();
      }
      }

      public void condition2(double value2){
      if (value2>=0 && value2<4.98)
      normal=true;
      else{
      normal=false;
      Frame f=new Frame("InfoDialog Test");
      f.resize(100,100);
      InfoDialog dlg=new InfoDialog(f,"Danger!",
       " Invalid Output Voltage.Try Again!");
      dlg.show();
      reset();
      }
      }

      private double test(double value){
      double input;
      if (value < 4.886)
      input=value + 0.114;
      else input=5.000;
      return input;
      }

      private void writeText(TextField obj, double value){
      value=(double)((int)(1000.*value)/1000.);
      obj.setText(Double.toString(value));
      }

      class InfoDialog extends Dialog{
      protected Button button;
      protected Label label;

      public InfoDialog(Frame parent, String title,String message){
      super(parent, title, true);

      this.setLayout(new BorderLayout(15,15));

      Panel p1=new Panel();
      p1.setLayout(new FlowLayout(FlowLayout.CENTER,15,15));
      p1.add(label=new Label(message));
      this.add("North",p1 );

      button=new Button("Okay");
      Panel p2=new Panel();
      p2.setLayout(new FlowLayout(FlowLayout.CENTER, 15, 15));
      p2.add(button);
      this.add("South",p2);
      this.pack();
      }

      public boolean action(Event e, Object arg){
      if(e.target==button){
      this.hide();
      this.dispose();
      return true;
      }
      else return false;
      }

      public boolean gotFocus(Event e, Object arg){
      button.requestFocus();
      return true;
      }
      }

      class DisplayCanvas extends Canvas{
      public DisplayCanvas(){
       setColor(Color.red);
       }

       public void setColor(Color colour){
       setForeground(colour);
       repaint();
      }


       public void paint(Graphics g){
       g.fillOval(10,20,130,130);
       g.fillOval(40,200,80,80);
       g.setColor(Color.blue);
       g.setFont(new Font("Helvetica", Font.BOLD,12));
       g.drawString("LED",70,190);
       g.drawString("Fiber-optic",60,310);
       }
      }

      // class graphCanvas extends Canvas{
      // double xg, yg;
      // public graphCanvas(){
      // setXY(5.,4.89);
      // }

      // public void setXY(double xd, double yd){
      // xg=xd;
      // yg=yd;
      // repaint();
      // }

      // public void paint(Graphics g){
      // int col, colMax, row;
      // colMax = (int)(260-(4.870/5*200));
      // g.setColor(Color.green);
      // g.drawLine(10,260,210,260);
      // g.drawLine(10,60,10,260);
      //
      // for(int i=10;i<=210;i+=20)
      // g.drawLine(i,258,i,262);
      // for(int i=60;i<=260;i+=20)
      // g.drawLine(8,i,12,i);

      // g.setColor(Color.white);
      // g.drawLine(10,260,139,260); //draw graph
      // g.drawLine(90,60,210,60);
      // g.drawLine(90,60,90,260);
      // g.drawLine(139,60,139,260);
      // g.drawString("0",10,275);
      // g.drawString("5",205,275);
      // g.drawString("INPUT(V)",160,290);
      // g.drawString("5",10,55);
      // g.drawString("OUTPUT(V)",10,35);

      // row=(int)(xg/5*210);
      // col=(int)(260-(yg/5*200));
      // g.setColor(Color.yellow);
      // if(row+5>=210)
      // g.fillOval(210,col-5,5,5);
      // else g.fillOval(row+5, col-3,5,5);
      // }
      // }

      // class graphFrame extends Frame{
      //
      // graphCanvas graphDisplay;
      // graphDisplay = new graphCanvas();
      // graphDisplay.setBackground(Color.black);

      // GridBagLayout gbLayout = new GridBagLayout();
      // setLayout(gbLayout);
      // GridBagConstraints gbConstraints = new GridBagConstraints();
      // gbConstraints.fill = GridBagConstraints.BOTH;
      // gbConstraints.weightx = 150;
      // add(graphDisplay, gbLayout, gbConstraints, 0, 0, 1, 7);
      // }

      public Insets insets(){
      return new Insets(10, 10, 10, 10);
      }
      }

amitd

hey man pls check ur import statemens u have not added java.awt.event.*;
pls add it & then compile
good luck

bhuey_ling

ASKER

Thanx!
rgds
hl