I have a problem to adding numbers in my window ?

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Java

Swing

My problem is whene i put the two number in the TextField , after clicking on the "Result" button it won't give me the total of two numbers !
and i m not sure about the Scanner that i add into the event, it s just my opinion about reading numbers in the JFrame .
here is my Code :





package calculator.addition;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Scanner;



public class CalculatorAddition {
public static int a ;
public static int b ;//globale var
public static int s ;

public CalculatorAddition(){

JFrame f = new JFrame();
JTextField t1 = new JTextField(" ");
JTextField t2 = new JTextField(" ");
JTextField t3 = new JTextField(" ");
JButton b3 = new JButton("result");

f.setSize(150,150);
t1.addActionListener((ActionEvent arg0) ->
{Scanner in = new Scanner(System.in);//i add Scanner method to read the numbers from user
a = in.nextInt();
t3.setText(Integer.toString(a));});



t2.addActionListener((ActionEvent arg0) -> //event
{Scanner in = new Scanner(System.in);
b = in.nextInt();
});


b3.addActionListener((ActionEvent) ->
{s = a+b ;
t3.setText(Integer.toString(s));
});




JPanel p = new JPanel();
p.add(t1);
p.add(t2);
p.add(t3);
p.add(b3);
f.getContentPane().add(p,BorderLayout.CENTER);
f.show();
}
public static void main(String...arg)
{ CalculatorAddition p = new CalculatorAddition();
}}

What I have tried:

i was change the event to new class but it keep doesn t work !