Java Swing 四则运算器

第一次接触Swing，应付一下作业

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

/**
 * @author feng
 * @version 1.0
 * <span>基于Swing的简单GUI四则运算器</span>
 */
public class Main {

    public static class JFrameCal extends JFrame implements ActionListener {
        /**
         * 按钮
         */
        private JButton []buttons={
                new JButton("+"),
                new JButton("-"),
                new JButton("*"),
                new JButton("\\"),
                new JButton("重置")
        };

        /**
         * 文本框
         */
        private JTextField []textFields={
                new JTextField("左操作数:",5),new JTextField(10),
                new JTextField("右操作数:",5),new JTextField(10),
                new JTextField("计算结果:",5),new JTextField(10)
        };

        private Container container = getContentPane();

        /**
         * 构造方法
         */
        public JFrameCal(){

            super("计算器");
            container.setLayout(new FlowLayout());

            for (JTextField i:textFields){
                i.setEditable(false);
                i.setPreferredSize(new Dimension(150,30));//设置大小
                container.add(i);
            }

            textFields[1].setEditable(true);//用户输入框
            textFields[3].setEditable(true);//用户输入框

            for (JButton b:buttons){
                b.addActionListener(this);//监听按钮
                container.add(b);
            }
            buttons[4].setPreferredSize(new Dimension(180,30));//设置重置按钮大小
        }

        /**
         * @param actionEvent
         */
        @Override
        public void actionPerformed(ActionEvent actionEvent) {
            JButton source=(JButton)actionEvent.getSource();
            if (source == buttons[0]){//加法运算
                Double res = Double.parseDouble(textFields[1].getText())+Double.parseDouble(textFields[3].getText());
                textFields[5].setText(res.toString());
            } else if (source == buttons[1]){//减法运算
                Double res = Double.parseDouble(textFields[1].getText())-Double.parseDouble(textFields[3].getText());
                textFields[5].setText(res.toString());
            } else if(source == buttons[2]){//乘法运算
                Double res = Double.parseDouble(textFields[1].getText())*Double.parseDouble(textFields[3].getText());
                textFields[5].setText(res.toString());
            } else if(source == buttons[3]){//除法运算
                //判断除法是否为0
                if (Double.parseDouble(textFields[3].getText()) == 0){
                    textFields[5].setText("除数不能为0!");
                } else {
                    Double res = Double.parseDouble(textFields[1].getText())+Double.parseDouble(textFields[3].getText());
                    textFields[5].setText(res.toString());
                }
            } else{//重置
                textFields[1].setText("");
                textFields[3].setText("");
                textFields[5].setText("");
            }
        }
    }

    public static void main(String[] args) {                              
        JFrameCal app = new JFrameCal();
        app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        app.setSize(200,250);
        app.setVisible(true);
    }
}

运行截图：

深度截图_选择区域_20181221211728.png