I need help in java calculator please i submit my assignment tomorrow 2+2=4 its work 2+2 then press + how to show result last

Question

how to show result last two variables on button + and

Answer 1

ok

Answer 2

package javaapplication15;
import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
class Gui22 extends WindowAdapter implements ActionListener{
Frame f;
Button b1,b2,b3,b4;
TextField tf;
double n1,n2,n3,re,add=0;
Panel p;

Gui22(){
f=new Frame("Calculator");
f.setLayout(new GridLayout(2,0));
f.setSize(300,300);
f.show();
p =new Panel();
p.setLayout(new GridLayout(2,2));

b1=new Button("1");
b2=new Button("2");
b3=new Button("+");
b4=new Button("=");
tf=new TextField(" ");
f.add(tf);
p.add(b1);
p.add(b2);
p.add(b3);
p.add(b4);
f.add(p);
f.addWindowListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);

}

public void windowClosing(WindowEvent we){
System.exit(0);
}

public void actionPerformed(ActionEvent ae) {
if(ae.getSource()==b1){
tf.setText(tf.getText()+b1.getLabel());
}if(ae.getSource()==b2){
tf.setText(tf.getText()+b2.getLabel());
}if(ae.getSource()==b3){
n1=Double.parseDouble(String.valueOf(tf.getText()));
tf.setText("");
add=1;

}
if(ae.getSource()==b4){
n2=Double.parseDouble(String.valueOf(tf.getText()));
if(add>0){
re=n1+n2;
tf.setText(" "+re);
n1=0;
n2=0;

}

}

}

public class JavaApplication15 {
public static void main(String[] args) {
Gui22 gu=new Gui22();
}

}

Answer 3

1+2=3 answer is correct

Answer 4

but when you use normal window calculator 2+2+ no use equal button then show answer 4

Answer 5

bro i try

Answer 6

no bro its not work

Answer 7

when i press 1 then print on screen (null1)

Answer 8

yes bro

Answer 9

bro can you send me your whatsapp no i can talk easily please

Answer 10

bro i don't know about insert

Answer 11

bro your facebook i d