Applet Working in the AppletViewer not Working in Explorer

Question

After a few compilation of the following code the changes I made to the java file were only viewed by the appletviewer, not the explorer, the change I have made and is not shown in the explorer is setting the foreground and back round of calPanel label. Please compile the code yourself:
import java.awt.*;
import java.lang.*;
import java.awt.event.*;
public class JavaCal extends java.applet.Applet implements ActionListener {
// The 2 variables contain the numbers
// for the action to take place
double doubleBuf1 = 0;
double doubleBuf2 = 0;
// Contains the numbers and act in string format
StringBuffer totalBuffer = new StringBuffer();
// Interface components
Button calPercent, calSqr, calClear, calDev, calSeven, calEight, calNine, calMul, calFour, calFive, calSix, calSub, calOne, calTwo, calThree, calAdd, calNull, calDec, calEquals;
Label calPanel = new Label("0", Label.RIGHT);
void buildConstraints(GridBagConstraints gbc, int gx, int gy,
int gw, int gh, int wx, int wy) {
gbc.gridx = gx;
gbc.gridy = gy;
gbc.gridwidth = gw;
gbc.gridheight = gh;
gbc.weightx = wx;
gbc.weighty = wy;
public void init() {  
setBackground(Color.white);
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints constraints = new GridBagConstraints();
setLayout(gridbag);
//Calculator Panel label field
buildConstraints(constraints, 0, 0, 4, 1, 0, 2);
constraints.fill = GridBagConstraints.BOTH;
gridbag.setConstraints(calPanel, constraints);
          calPanel.setForeground(new Color(65280));
          calPanel.setBackground(new Color(0));
add(calPanel);
constraints.fill = GridBagConstraints.NONE;
//Button %
buildConstraints(constraints, 0, 1, 1, 1, 100, 100);
constraints.fill = GridBagConstraints.BOTH;
calPercent = new Button("%");
gridbag.setConstraints(calPercent, constraints);
add(calPercent);
calPercent.addActionListener(this);
//Button Sqr
buildConstraints(constraints, 1, 1, 1, 1, 100, 100);
calSqr = new Button("sqr");
gridbag.setConstraints(calSqr, constraints);
add(calSqr);
calSqr.addActionListener(this);
//Button Clear
buildConstraints(constraints, 2, 1, 1, 1, 100, 100);
constraints.fill = GridBagConstraints.BOTH;
calClear = new Button("c");
gridbag.setConstraints(calClear, constraints);
add(calClear);
calClear.addActionListener(this);
//Button \
buildConstraints(constraints, 3, 1, 1, 1, 100, 100);
calDev = new Button("/");
gridbag.setConstraints(calDev, constraints);
add(calDev);
calDev.addActionListener(this);
//Button 7
buildConstraints(constraints, 0, 2, 1, 1, 100, 100);
calSeven = new Button("7");
gridbag.setConstraints(calSeven, constraints);
add(calSeven);
calSeven.addActionListener(this);
//Button 8
buildConstraints(constraints, 1, 2, 1, 1, 100, 100);
calEight = new Button("8");
gridbag.setConstraints(calEight, constraints);
add(calEight);
calEight.addActionListener(this);
//Button 9
buildConstraints(constraints, 2, 2, 1, 1, 100, 100);
calNine = new Button("9");
gridbag.setConstraints(calNine, constraints);
add(calNine);
calNine.addActionListener(this);
//Button *
buildConstraints(constraints, 3, 2, 1, 1, 100, 100);
calMul = new Button("*");
gridbag.setConstraints(calMul, constraints);
add(calMul);
calMul.addActionListener(this);
//Button 4
buildConstraints(constraints, 0, 3, 1, 1, 100, 100);
calFour = new Button("4");
gridbag.setConstraints(calFour, constraints);
add(calFour);
          calFour.addActionListener(this);
//Button 5
buildConstraints(constraints, 1, 3, 1, 1, 100, 100);
calFive = new Button("5");
gridbag.setConstraints(calFive, constraints);
add(calFive);
          calFive.addActionListener(this);
//Button 6
buildConstraints(constraints, 2, 3, 1, 1, 100, 100);
calSix = new Button("6");
gridbag.setConstraints(calSix, constraints);
add(calSix);
          calSix.addActionListener(this);
//Button -
buildConstraints(constraints, 3, 3, 1, 1, 100, 100);
calSub = new Button("-");
gridbag.setConstraints(calSub, constraints);
add(calSub);
calSub.addActionListener(this);
//Button 1
buildConstraints(constraints, 0, 4, 1, 1, 100, 100);
calOne = new Button("1");
gridbag.setConstraints(calOne, constraints);
add(calOne);
          calOne.addActionListener(this);
//Button 2
buildConstraints(constraints, 1, 4, 1, 1, 100, 100);
calTwo = new Button("2");
gridbag.setConstraints(calTwo, constraints);
add(calTwo);
calTwo.addActionListener(this);
//Button 3
buildConstraints(constraints, 2, 4, 1, 1, 100, 100);
calThree = new Button("3");
gridbag.setConstraints(calThree, constraints);
add(calThree);
calThree.addActionListener(this);
//Button +
buildConstraints(constraints, 3, 4, 1, 2, 100, 100);
calAdd = new Button("+");
gridbag.setConstraints(calAdd, constraints);
add(calAdd);
calAdd.addActionListener(this);
//Button 0
buildConstraints(constraints, 0, 5, 1, 1, 100, 100);
calNull = new Button("0");
gridbag.setConstraints(calNull, constraints);
add(calNull);
calNull.addActionListener(this);
//Button .
buildConstraints(constraints, 1, 5, 1, 1, 100, 100);
calDec = new Button(".");
gridbag.setConstraints(calDec, constraints);
add(calDec);
calDec.addActionListener(this);
//Button =
buildConstraints(constraints, 2, 5, 1, 1, 100, 100);
calEquals = new Button("=");
gridbag.setConstraints(calEquals, constraints);
add(calEquals);
calEquals.addActionListener(this);
     public void actionPerformed(ActionEvent event)
          /* Declares an object named "src" to represent the event.getSource()
          * method. This shortens the code that follows.
          Object src = event.getSource();
          /* Checks to see if the source of the event which src is representing
          * is a Button and can behave like a Button
          if (src instanceof Button)
     if(src == calNull) calPanel.setText("0");
     if (src == calOne) calPanel.setText("1");
     if(src == calTwo) calPanel.setText("2");
     if(src == calThree) calPanel.setText("3");
     if(src == calFour) calPanel.setText("4");
     if(src == calFive) calPanel.setText("5");
     if(src == calSix) calPanel.setText("6");
     if(src == calSeven) calPanel.setText("7");
     if(src == calEight) calPanel.setText("8");
     if(src == calNine) calPanel.setText("9");
     if(src == calAdd) calPanel.setText("+");
     if(src == calSub) calPanel.setText("-");
     if(src == calMul) calPanel.setText("*");
     if(src == calDev) calPanel.setText("/");
     if(src == calDec) calPanel.setText(".");
     if(src == calEquals) calPanel.setText("=");
     if(src == calClear) calPanel.setText("c");
     if(src == calSqr) calPanel.setText("sqr");
     if(src == calPercent) calPanel.setText("%");                         
}

Answer 1

Well,
ata the end of init() method add two lines:
doLayout();
validate();