java使用工厂模式编写计算器（swing界面）

使用工厂模式编写计算器

首先我们先有算法这个接口

1：算法接口

package com.v4;public class Arithmetic {    public int count(String str){        return 0;    }}

2：算法工厂类

package com.v4;public class ArithmeticFactory {public static Arithmetic getArith(String str){        Arithmetic ari = null;        if(str.indexOf("+") != -1){            ari = new Add();        }else if(str.indexOf("-") != -1){            ari = new Minus();        }else if(str.indexOf("*") != -1){            ari = new Multiply();        }else if(str.indexOf("/") != -1){            ari = new Divide();        }         return ari;    }}

3：相加类

package com.v4;public class Add extends Arithmetic{    @Override    public int count(String str) {        String[] strs = str.split("\\+");        return Integer.parseInt(strs[0])+Integer.parseInt(strs[1]);    }}

4:相减类

package com.v4;public class Minus extends Arithmetic{    @Override    public int count(String str) {        // TODO Auto-generated method stub        String[] strs = str.split("-");        return Integer.parseInt(strs[0])-Integer.parseInt(strs[1]);    }

5:相乘类

package com.v4;public class Multiply extends Arithmetic{    @Override    public int count(String str) {        // TODO Auto-generated method stub        String[] strs = str.split("\\*");        return Integer.parseInt(strs[0])*Integer.parseInt(strs[1]);    }}

6:相除类

package com.v4;public class Divide extends Arithmetic{   @Override    public int count(String str) {        // TODO Auto-generated method stub        String[] strs = str.split("/");    return Integer.parseInt(strs[0])/Integer.parseInt(strs[1]);    }}

7:swing页面类

package com.v4;import java.util.Scanner;package com.v4;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import java.awt.Color;import javax.swing.JButton;import java.awt.event.ActionListener;import java.awt.event.ActionEvent;import java.awt.event.FocusEvent;import java.awt.event.FocusListener;import javax.swing.JTextField;import javax.swing.SwingConstants;import javax.swing.JLabel;import java.awt.event.FocusAdapter;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;public class Calculator extends JFrame implements ActionListener {    private JPanel contentPane;    private JTextField textField;    JButton button_1;    JButton button_2;    JButton button_3;    JButton button_4;    JButton button_5;    JButton button_6;    JButton button_7;    JButton button_8;    JButton button_9;    JButton button_0;    JButton button_add;    JButton button_minus;    JButton button_mulptily;    JButton button_divide;    JButton button_clear;    JButton button_equal;    /**     * Launch the application.     */    public static void main(String[] args) {        EventQueue.invokeLater(new Runnable() {            public void run() {                try {                    Calculator frame = new Calculator();                    frame.setVisible(true);                } catch (Exception e) {                    e.printStackTrace();                }            }        });    }    /**     * Create the frame.     */    public Calculator() {        setBackground(Color.WHITE);        setTitle("计算器");        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        setBounds(100, 100, 450, 300);        contentPane = new JPanel();        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));        contentPane.setLayout(new BorderLayout(0, 0));        setContentPane(contentPane);        JPanel panel = new JPanel();        contentPane.add(panel, BorderLayout.CENTER);        panel.setLayout(null);        textField = new JTextField();        textField.setBounds(12, 12, 412, 36);        textField.setHorizontalAlignment(SwingConstants.RIGHT);        panel.add(textField);        textField.setColumns(10);        button_4 = new JButton("4");        button_4.setBounds(12, 103, 85, 31);        button_4.addActionListener(this);        panel.add(button_4);        button_5 = new JButton("5");        button_5.setBounds(120, 103, 85, 31);        button_5.addActionListener(this);        panel.add(button_5);        button_1 = new JButton("1");        button_1.setBounds(12, 60, 85, 31);        button_1.addActionListener(this);        panel.add(button_1);        button_6 = new JButton("6");        button_6.setBounds(231, 103, 85, 31);        button_6.addActionListener(this);        panel.add(button_6);        button_7 = new JButton("7");        button_7.setBounds(12, 146, 85, 31);        button_7.addActionListener(this);        panel.add(button_7);        button_8 = new JButton("8");        button_8.setBounds(120, 146, 85, 31);        button_8.addActionListener(this);        panel.add(button_8);        button_9 = new JButton("9");        button_9.setBounds(231, 146, 85, 31);        button_9.addActionListener(this);        panel.add(button_9);        button_2 = new JButton("2");        button_2.setBounds(120, 60, 85, 31);        button_2.addActionListener(this);        panel.add(button_2);        button_3 = new JButton("3");        button_3.setBounds(231, 60, 85, 31);        button_3.addActionListener(this);        panel.add(button_3);        button_0 = new JButton("0");        button_0.setBounds(12, 189, 85, 31);        button_0.addActionListener(this);        panel.add(button_0);        button_clear = new JButton("清空");        button_clear.setBounds(120, 189, 85, 31);        button_clear.addActionListener(this);        panel.add(button_clear);        button_add = new JButton("+");        button_add.setBounds(339, 60, 85, 31);        button_add.addActionListener(this);        panel.add(button_add);        button_minus = new JButton("-");        button_minus.setBounds(339, 103, 85, 31);        button_minus.addActionListener(this);        panel.add(button_minus);        button_mulptily = new JButton("*");        button_mulptily.setBounds(339, 146, 85, 31);        button_mulptily.addActionListener(this);        panel.add(button_mulptily);        button_divide = new JButton("/");        button_divide.setBounds(339, 189, 85, 31);        button_divide.addActionListener(this);        panel.add(button_divide);        button_equal = new JButton("=");        button_equal.setBounds(231, 189, 85, 31);        button_equal.addActionListener(this);        panel.add(button_equal);    }    @Override    public void actionPerformed(ActionEvent e) {        // TODO Auto-generated method stub        if (e.getSource() == button_equal) {            Arithmetic ari = ArithmeticFactory.getArith(textField.getText());            int num = ari.count(textField.getText());            textField.setText("" + num);        } else if (e.getSource() == button_clear) {            textField.setText("");        } else {            textField.setText(textField.getText() + e.getActionCommand());        }    }}

效果图：