计算器(java源码)

View包

display.java

package View;import Controller.control;import Model.Data;import javax.swing.*;import java.awt.*;/** * Created by My-Computer on 2016/5/15. */public class display extends JFrame{    JTextField text = null;    JPanel buttonPanel = new JPanel();    MyButton[][] allButton = new MyButton[6][4];    Data data = new Data();    String[] buttonTitle = {"%", "sqrt", "square", "1/x", "CE", "C", "<-", "/", "7", "8", "9", "*", "4", "5", "6", "-", "1", "2", "3", "+", "+/-", "0", ".", "="};    public display(){        GridBagConstraints c = new GridBagConstraints();        GridBagLayout grid = new GridBagLayout();        text = new JTextField();        setTitle("Calculator");        setLayout(grid);        text.setFont(new Font("微软雅黑", Font.PLAIN, 16));        c.weightx = 1.0;        c.fill = GridBagConstraints.BOTH;        c.gridwidth = GridBagConstraints.REMAINDER;        grid.setConstraints(text, c);        add(text);        c.weighty = 1.0;        grid.setConstraints(buttonPanel, c);        add(buttonPanel);        buttonPanel.setLayout(new GridLayout(6, 4));        for (int i = 0; i < 6; i++){            for (int j = 0; j < 4; j++){                allButton[i][j] = new MyButton(buttonTitle[i*4+j], buttonPanel, text, data);            }        }        setVisible(true);        pack();    }    public static void main(String[] args) {        new display();    }}class MyButton extends JButton{    public MyButton(String title, JPanel father, JTextField text, Data data){        setText(title);        father.add(this);        addActionListener(new control(text, data));    }}

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Model包

Data.java

package Model;/** * Created by My-Computer on 2016/5/15. */public class Data {    public static double eps = 1e-5;    public double answer;    public double operation;    public boolean flag = false;    public boolean isEnd = false;    public int operator;    /*    * operator=0  +    * operator=1  -    * operator=2  *    * operator=3  /    * operator=4  %     */    public Data(){        init();    }    public void init(){        answer = 0;        operation = 0;        operator = -1;        flag = false;        isEnd = false;    }}

Operator.java

package Model;/** * Created by My-Computer on 2016/5/15. */public class Operator{    public static double Calc(Data date, String op) throws ArithmeticException{        double ret = 0;        switch (date.operator){            case -1: date.answer = date.operation; break;            case 0:  date.answer += date.operation; break;            case 1: date.answer -= date.operation; break;            case 2: date.answer *= date.operation; break;            case 3: if (Math.abs(date.operation) < date.eps){                throw new ArithmeticException();            }                date.answer /= date.operation; break;            case 4: date.answer %= date.operation; break;        }        if (op.equals("+")){            date.operator = 0;        }else if (op.equals("-")){            date.operator = 1;        }else if (op.equals("*")){            date.operator = 2;        }else if (op.equals("/")){            date.operator = 3;        }else if (op.equals("%")){            date.operator = 4;        }else if (op.equals("=")){            date.operator = -1;        }        return ret;    }}

Controller包

control.java

package Controller;import Model.Data;import Model.Operator;import javax.swing.*;import java.awt.event.*;import java.awt.geom.Arc2D;/** * Created by My-Computer on 2016/5/15. */public class control implements ActionListener{    private JTextField text;    private Data data;    public control(JTextField text, Data data){        this.text = text;        this.data = data;    }    @Override    public void actionPerformed(ActionEvent e) {        String s = e.getActionCommand();        if (data.isEnd){            if (s=="C"){                data.init();                text.setText("");            }            return;        }        if (s.length()==1 && "0123456789.".indexOf(s) >= 0){            HandleNumber(s);        }else {            HandleOperator(s);        }    }    private void HandleNumber(String s){        String tmp = text.getText();        if (data.flag){            System.out.println(text.getText());            text.setText("");            System.out.println(text.getText());            data.flag = false;        }        if (s.equals(".")){            if(tmp.indexOf(".") >= 0){                return;            }else if (tmp.length()==0){                text.setText("0.");            }else{                text.setText(tmp+".");            }        }else if (s.equals("0")){            if (tmp.equals('0')){                return;            }            text.setText(tmp+"0");        }else{            text.setText(tmp+s);        }    }    private void HandleOperator(String s){        String tmp = text.getText();        try {            if (s.equals("<-")) {                if (data.flag){                    text.setText("");                    data.flag = false;                    return;                }                if (tmp.length() == 0) {                    return;                } else {                    text.setText(tmp.substring(0, tmp.length() - 1));                }            } else if (s.equals("CE")) {                text.setText("");            } else if (s.equals("C")) {                data.init();                text.setText("");            } else if (s.equals("+/-")) {                if (tmp.indexOf('-') < 0) {                    text.setText('-' + tmp);                } else {                    text.setText(tmp.substring(1, tmp.length()));                }            } else if (s.equals("sqrt")) {                text.setText(Double.toString(Math.sqrt(Double.parseDouble(tmp))));                data.flag = true;            }else if (s.equals("1/x")){                if(Double.parseDouble(tmp) == 0){                    throw new ArithmeticException();                }                text.setText(Double.toString(1/Double.parseDouble(tmp)));                data.flag = true;            }else if (s.equals("square")){                text.setText(Double.toString(Math.pow(Double.parseDouble(tmp) , 2)));                data.flag = true;            }else{                data.operation = Double.parseDouble(tmp);                Operator.Calc(data, s);                text.setText("");                if (s=="="){                    text.setText(Double.toString(data.answer));                    data.isEnd = true;                }            }        }catch (ArithmeticException e){            JOptionPane.showMessageDialog(null, "0不能作为除数!", "Error!", JOptionPane.ERROR_MESSAGE);            text.setText("");        }catch (NumberFormatException e){            return;        }    }}