编写一个应用程序，在窗口输入a、b、c三个数值，实现ax2+bx+c=0的求解，并将最终的求解的结果在窗口显示出来。用Java实现

好的，我可以为您提供一个使用Java Swing库编写的GUI程序来实现您的需求。

下面是程序代码：

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

public class QuadraticEquationSolver extends JFrame implements ActionListener {
    private JTextField aTextField, bTextField, cTextField, resultTextField;

    public QuadraticEquationSolver() {
        setTitle("Quadratic Equation Solver");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 200);

        JLabel aLabel = new JLabel("a:");
        aTextField = new JTextField(10);
        JPanel aPanel = new JPanel();
        aPanel.add(aLabel);
        aPanel.add(aTextField);

        JLabel bLabel = new JLabel("b:");
        bTextField = new JTextField(10);
        JPanel bPanel = new JPanel();
        bPanel.add(bLabel);
        bPanel.add(bTextField);

        JLabel cLabel = new JLabel("c:");
        cTextField = new JTextField(10);
        JPanel cPanel = new JPanel();
        cPanel.add(cLabel);
        cPanel.add(cTextField);

        JButton solveButton = new JButton("Solve");
        solveButton.addActionListener(this);
        JPanel buttonPanel = new JPanel();
        buttonPanel.add(solveButton);

        JLabel resultLabel = new JLabel("Result:");
        resultTextField = new JTextField(20);
        resultTextField.setEditable(false);
        JPanel resultPanel = new JPanel();
        resultPanel.add(resultLabel);
        resultPanel.add(resultTextField);

        Container container = getContentPane();
        container.setLayout(new GridLayout(5, 1));
        container.add(aPanel);
        container.add(bPanel);
        container.add(cPanel);
        container.add(buttonPanel);
        container.add(resultPanel);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        try {
            double a = Double.parseDouble(aTextField.getText());
            double b = Double.parseDouble(bTextField.getText());
            double c = Double.parseDouble(cTextField.getText());
            double delta = b * b - 4 * a * c;
            if (delta < 0) {
                resultTextField.setText("No real root!");
            } else if (delta == 0) {
                double x = -b / (2 * a);
                resultTextField.setText("x = " + x);
            } else {
                double x1 = (-b + Math.sqrt(delta)) / (2 * a);
                double x2 = (-b - Math.sqrt(delta)) / (2 * a);
                resultTextField.setText("x1 = " + x1 + ", x2 = " + x2);
            }
        } catch (NumberFormatException exception) {
            resultTextField.setText("Invalid input!");
        }
    }

    public static void main(String[] args) {
        QuadraticEquationSolver frame = new QuadraticEquationSolver();
        frame.setVisible(true);
    }
}

您可以复制代码并在本地运行。当您输入三个数值并单击"Solve"按钮时，程序将计算二次方程的根并在界面上显示结果。