CalculatorApplet
========================================================================
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class CalculatorApplet extends Applet {
private TextField opKiriTextField;
private TextField opKananTextField;
private Choice OperatorChoice;
private Button samaDenganButton;
private Label hasilLabel;
private Panel panel;
private String listOperator[]={"x",":","+","-"};
public CalculatorApplet(){
panel=new Panel();
opKiriTextField=new TextField();
opKananTextField=new TextField();
OperatorChoice=new Choice();
samaDenganButton=new Button("=");
hasilLabel=new Label();
OperatorChoice.removeAll();
for(int i=0; i<listOperator.length; i++){
OperatorChoice.addItem(listOperator[i]);
}
this.add(panel);
panel.setSize(560,120);
panel.setLayout(null);
panel.add(opKiriTextField);
panel.add(opKananTextField);
panel.add(OperatorChoice);
panel.add(samaDenganButton);
panel.add(hasilLabel);
opKiriTextField.setBounds(30,30,70,30);
OperatorChoice.setBounds(130,30,70,30);
opKananTextField.setBounds(230,30,70,30);
samaDenganButton.setBounds(330,30,70,30);
hasilLabel.setBounds(430,30,100,30);
samaDenganButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent evt){
hitungButtonActionPerformed(evt);
}
});
}
private void hitungButtonActionPerformed(ActionEvent evt){
double opKiri=0, opKanan=0, hasil=0;
try{
opKiri=Double.parseDouble(opKiriTextField.getText());
}catch(Exception ex){}
try{
opKanan=Double.parseDouble(opKananTextField.getText());
}catch(Exception ex){}
switch(OperatorChoice.getSelectedIndex()){
case 0: hasil = opKiri * opKanan ; break;
case 1: hasil = opKiri / opKanan ; break;
case 2: hasil = opKiri + opKanan ; break;
case 3: hasil = opKiri - opKanan ; break;
}
hasilLabel.setText(Double.toString(hasil));
}
}
========================================================================
html calculator
========================================================================
<html>
<head>
<title>Calculator menggunakan Applet</title>
</head>
<body>
<applet> code="CalculatorApplet" width=560 height=120></applet>
</body>
</html>
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