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Java简易计算器

2009-09-06 01:07 148 查看

只实现了加功能。
import java.applet.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;

public class Calculator extends Applet implements ActionListener{
Button[] bu_array = new Button[10];
TextField result = new TextField(30);
private int before ;
Button add = new Button("+");
Button equal = new Button("=");

public void init(){
Panel p_text = new Panel();
Panel p_num = new Panel();
Panel p_calc = new Panel();

this.setLayout(new BorderLayout());
this.add(p_text, BorderLayout.NORTH);
this.add(p_num, BorderLayout.CENTER);
this.add(p_calc, BorderLayout.EAST);

p_text.add(result);

p_num.setLayout(new GridLayout(4,3));

for(int i=0; i<bu_array.length; i++){
bu_array[i] =new Button(Integer.toString(i));
p_num.add(bu_array[i]);
bu_array[i].addActionListener(this);
}

p_calc.setLayout(new GridLayout(4,2));

Button sub = new Button("-");
Button mul = new Button("*");
Button div = new Button("/");
Button mod = new Button("%");
Button clear = new Button("C");

p_calc.add(add);
p_calc.add(sub);
p_calc.add(mul);
p_calc.add(div);
p_calc.add(mod);
p_calc.add(equal);
p_calc.add(clear);

add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
mod.addActionListener(this);
equal.addActionListener(this);
clear.addActionListener(this);
}

public void actionPerformed(ActionEvent e){
Object source = e.getSource();

if(source.equals(add)){
this.before = Integer.parseInt(result.getText());
result.setText("");
}

if(source.equals(equal)){
result.setText(Integer.toString((this.before + Integer.parseInt(result.getText()))));
}

for(int i=0; i<bu_array.length; i++){
if(source.equals(bu_array[i])){
result.setText(result.getText()+Integer.toString(i));
}
}

}

public static void main(String [] args){
}
}

<html>
<head></head>
<body>
<applet height="200" width="200" code="Calculator.class"></applet>
</body>
</html>

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