一个窗口，用户输入三个数，你判断能否构成三角形以及面积

最新推荐文章于 2024-08-21 17:44:48 发布

jane1208146

最新推荐文章于 2024-08-21 17:44:48 发布

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分类专栏： java学习历程文章标签： button import string input class c

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package triangle1;

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

public class triangle1 {

    JFrame frame1 = new JFrame("three sides");
    JFrame frame2 = new JFrame("the area");
    JFrame frame3 = new JFrame("error information");
    JLabel label1 = new JLabel("Please input three sides of the triangle:");
    JLabel label2 = new JLabel();
    JLabel label3 = new JLabel("error occurring!");
    JTextField textfield1 = new JTextField(7);
    JTextField textfield2 = new JTextField(7);
    JTextField textfield3 = new JTextField(7);
    JButton button1 = new JButton("OK");
    JButton button2 = new JButton("OK");
    JButton button3 = new JButton("OK");

    public triangle1() {
        frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame1.getContentPane().setLayout(new java.awt.FlowLayout());
        frame2.getContentPane().setLayout(new java.awt.FlowLayout());
        frame3.getContentPane().setLayout(new java.awt.FlowLayout());

button1.addActionListener((ActionListener) new ActionListener() {

public void actionPerformed(ActionEvent e) {
if (!textfield1.getText().equals("") && !textfield2.getText().equals("") && !textfield3.getText().equals("")) {

                    double a = Double.parseDouble(textfield1.getText());
                    double b = Double.parseDouble(textfield2.getText());
                    double c = Double.parseDouble(textfield3.getText());
                    if ((a + b) > c && (b + c) > a && (c + a) > b) {
                        double s = (a + b + c) / 2;
                        double area = s * (s - a) * (s - b) * (s - c);
                        label2.setText("The area of the triangle is" + area);

                        frame2.show();
                    } else {
                        frame3.show();
                    }
                } else {
                    frame3.show();
                }

}
});

button2.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                frame2.dispose();
            }
        });

button3.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                frame3.dispose();
            }
        });

        frame1.getContentPane().add(label1);
        frame1.getContentPane().add(textfield1);
        frame1.getContentPane().add(textfield2);
        frame1.getContentPane().add(textfield3);
        frame1.getContentPane().add(button1);
        frame2.getContentPane().add(label2);
        frame2.getContentPane().add(button2);
        frame3.getContentPane().add(label3);
        frame3.getContentPane().add(button3);

        frame1.setSize(400, 200);
        frame2.setSize(400, 200);
        frame3.setSize(400, 200);

}

    public static void main(String[] args) {
        triangle1 triangle11 = new triangle1();
        triangle11.show();
    }

    private void show() {
        frame1.show();
    }
}