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Textfield.java
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Textfield.java
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import java.awt.*;
import java.awt.event.*;
class textfield extends Frame implements ActionListener{
TextField tf1;
TextField tf2;
TextField tf3;
Button b1,b2;
textfield(){
tf1=new TextField();
tf2=new TextField();
tf3=new TextField();
b1=new Button("+");
b2=new Button("-");
tf1.setBounds(100,100,100,20);
tf2.setBounds(100,150,100,20);
tf3.setBounds(150,300,100,20);
b1.setBounds(100,200,100,20);
b2.setBounds(200,200,100,20);
setLayout(null);
setSize(500,500);
setVisible(true);
b1.addActionListener(this);
b2.addActionListener(this);
add(tf1);
add(tf2);
add(b1);
add(b2);
add(tf3);
// b1.addActionListener(new ActionListener(){
// public void actionPerformed(ActionEvent e){
// String s1=tf1.getText();
// String s2=tf2.getText();
// int a = Integer.parseInt(s1);
// int b = Integer.parseInt(s2);
// int c=0;
// c=a+b;
// String result=String.valueOf(c);
// tf3.setText(result);
// }
// });
// b2.addActionListener(new ActionListener(){
// public void actionPerformed(ActionEvent e){
// String s1=tf1.getText();
// String s2=tf2.getText();
// int a = Integer.parseInt(s1);
// int b = Integer.parseInt(s2);
// int c=0;
// c=a-b;
// String result=String.valueOf(c);
// tf3.setText(result);
// }
// }); ------------------->> This is the one way.
}
public void actionPerformed(ActionEvent e){
String s1= tf1.getText();
String s2= tf2.getText();
int a=Integer.parseInt(s1);
int b = Integer.parseInt(s2);
int c=0;
if(e.getSource()==b1){
c=a+b;
}
else if(e.getSource()==b2){
c=a-b;
}
String result=String.valueOf(c);
tf3.setText(result);
}
public static void main(String args[]){
textfield f = new textfield();
}
}
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