†`Li†o`†
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Age : 28
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Job/hobbies : Playing Computer Games.
 |  Subject: JAVA CALCULATE  Mon Sep 17, 2012 2:14 pm | |
| - Quote :
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.regex.*;
class Calculate extends JFrame{
JButton ADD;
JPanel panel;
JLabel label1,label2;
final JTextField text1,text2;
int cal;
Calculate(){
label1 = new JLabel();
label1.setText("Enter First Number:");
text1 = new JTextField(20);
label2 = new JLabel();
label2.setText("Enter Second Number:");
text2 = new JTextField(20);
ADD=new JButton("Add");
panel=new JPanel(new GridLayout(3,2));
panel.add(label1);
panel.add(text1);
panel.add(label2);
panel.add(text2);
panel.add(ADD);
add(panel);
setVisible(true);
pack();
setTitle("Calculate");
ADD.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
String value1=text1.getText();
String value2=text2.getText();
Pattern p=Pattern.compile("[A-Z,a-z,&%$#@!()*^]");
Matcher m1 = p.matcher(value1);
Matcher m2 = p.matcher(value2);
if(value1.length()==0){
JOptionPane.showMessageDialog(null,"Enter first number","Error",JOptionPane.ERROR_MESSAGE);
}
else if(m1.find()){
JOptionPane.showMessageDialog(null,"Enter second nuber","Error",JOptionPane.ERROR_MESSAGE);
text1.setText("");
}
else if(value2.length()==0){
JOptionPane.showMessageDialog(null,"Enter only number!","Error",JOptionPane.ERROR_MESSAGE);
text2.setText("");
}
else{
int n1=Integer.parseInt(value1);
int n2=Integer.parseInt(value2);
cal=n1+n2;
JOptionPane.showMessageDialog(null,"Additon of two numbers is:"+Integer.toString(cal));
}
}
});
}
public static void main(String arg[]){
new Calculate();
}
}
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