Java GUI using intellij

Question

hello everyone, can help me to solve the problem. i want to make program to calculate the interpolation with Java GUI. when the calculate button pressed, there is no value on the inputText1. i want the inputText1 display the value after all Textfield has has value from user input. the code is below:

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

public class contohInterpolasi {
private Scanner userInput;
private JPanel panelInterpolasi;
private JLabel labelX1;
private JLabel labelX2;
private JLabel labelY1;
private JLabel labelY2;
private JLabel labelY;
private JLabel labelX;
private JTextField textX1;
private JButton buttonCalculate;
private JFormattedTextField inputTextX;
private JFormattedTextField inputTextY;
private JFormattedTextField inputTextX1;
private JFormattedTextField inputTextX2;
private JFormattedTextField inputTextY1;
private JFormattedTextField inputTextY2;
private JButton exit;
contohInterpolasi() {
exit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
buttonCalculate.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
double X1 = (double) inputTextX1.getValue();
double X2 = (double) inputTextX2.getValue();
double Y1 = (double) inputTextY1.getValue();
double Y2 = (double) inputTextY2.getValue();
double Y = (double) inputTextY.getValue();
double X = ((Y-Y1)*(X2-X1)/(Y2-Y1))+X1;
}
});
}

Answer 1

continue program from above:
public static void main(String[] args) {
JFrame frame = new JFrame("contohInterpolasi");
frame.setContentPane(new contohInterpolasi().panelInterpolasi);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
frame.setSize(600,600);
}
}