jisuanqi.java

一个java 课程设计作业

// Decompiled by Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3) ansi 
// Source File Name:   MainFrame.java

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

public class JiSuanQi  extends JFrame implements ActionListener
{

    int able;
    //JFrame frame;
    JMenuBar bar;
    JPanel panel;
    JPanel panel1;
    JPanel panel2;
    JPanel panel3;
    JTextField textAnswer;
    JButton lKH;
    JButton rKH;
    JButton BackSpace;
    JButton clear;
    JButton bAdd;
    JButton bSub;
    JButton bMul;
    JButton bDiv;
    JButton benter;
    JButton b[];
    JMenu mFile;
    JMenu mHelp;
    JMenuItem iopen;
    JMenuItem iexit;
    JMenuItem iabout;
    JMenuItem ihelp;

    public JiSuanQi()
    {
        super("计算器");
    	able = 0;
        
        setBounds(100, 100, 300, 300);
        panel = new JPanel();
        panel1 = new JPanel();
        GridLayout gridlayout = new GridLayout(5, 4, 5, 5);
        
        panel.setLayout(new BorderLayout());
        panel1.setLayout(gridlayout);
        
        textAnswer = new JTextField(15);
        textAnswer.setText("");
        textAnswer.setEditable(false);
        textAnswer.setBackground(new Color(255, 255, 255));
        textAnswer.setBounds(0, 0, 200, 20);
        
        lKH = new JButton(" (");
        rKH = new JButton(" )");
        BackSpace = new JButton("←");
        clear = new JButton("C");
        bAdd = new JButton("+");
        bSub = new JButton("_");
        bMul = new JButton("*");
        bDiv = new JButton("/");
        benter = new JButton("=");
        b = new JButton[10];
        for(int i = 0; i < b.length; i++)
            b[i] = new JButton(Integer.toString(i));

        panel1.add(lKH);
        panel1.add(rKH);
        panel1.add(BackSpace);
        panel1.add(clear);
        panel1.add(b[7]);
        panel1.add(b[8]);
        panel1.add(b[9]);
        panel1.add(bAdd);
        panel1.add(b[4]);
        panel1.add(b[5]);
        panel1.add(b[6]);
        panel1.add(bSub);
        panel1.add(b[1]);
        panel1.add(b[2]);
        panel1.add(b[3]);
        panel1.add(bMul);
        panel1.add(b[0]);
        panel1.add(benter);
        panel1.add(bDiv);
        
        panel.add(textAnswer, "North");
        panel.add(panel1, "Center");
                
        getContentPane().add(panel);        
        
        bar = new JMenuBar();
        setJMenuBar(bar);
        mFile = new JMenu("文件");
        iopen = new JMenuItem("批处理。。。");
        iexit = new JMenuItem("退出");
        mFile.add(iopen);
        mFile.add(iexit);
        bar.add(mFile);
        mHelp = new JMenu("帮助");
        iabout = new JMenuItem("关于");
        ihelp = new JMenuItem("帮助主题");
        mHelp.add(iabout);
        mHelp.add(ihelp);
        bar.add(mHelp);             
        
        lKH.addActionListener(this);
        rKH.addActionListener(this);
        BackSpace.addActionListener(this);
        clear.addActionListener(this);
        bAdd.addActionListener(this);
        bSub.addActionListener(this);
        bMul.addActionListener(this);
        bDiv.addActionListener(this);
        benter.addActionListener(this);
        b[1].addActionListener(this);
        b[2].addActionListener(this);
        b[3].addActionListener(this);
        b[4].addActionListener(this);
        b[5].addActionListener(this);
        b[6].addActionListener(this);
        b[7].addActionListener(this);
        b[8].addActionListener(this);
        b[9].addActionListener(this);
        b[0].addActionListener(this);
        iopen.addActionListener(this);
        ihelp.addActionListener(this);
        iabout.addActionListener(this);
        setVisible(true);
    }
    //取得输入框中的最后一个字符
    public char getLastChar()
    {
        String s = textAnswer.getText();
        int i = s.length() - 1;
        if(i == -1)
        {
            return '@';
        } else
        {
            char c = s.charAt(i);
            return c;
        }
    }
    //判断输入框中有没有运算符，如果有返回true,否则返回false
    public boolean getright()
    {
        String s = textAnswer.getText();
        for(int i = 0; i < s.length(); i++)
            if((s.charAt(i) == '+' || s.charAt(i) == '-' || s.charAt(i) == '*' || s.charAt(i) == '/') && getLastChar() != '+' && getLastChar() != '-' && getLastChar() != '*' && getLastChar() != '/')
                return true;

        return false;
    }
   
    public void actionPerformed(ActionEvent actionevent)
    {
        Object obj = actionevent.getSource();
        //如果输入的是数字，将新输入的数字和已经存在的数字拼接成一个数
        for(int i = 0; i <= 9; i++)
            if(obj == b[i] && getLastChar() != ')')
                textAnswer.setText(textAnswer.getText() + Integer.toString(i));

        if(obj == iopen)
        {
            JOptionPane.showMessageDialog(panel, "输入文件为in.txt");
            try
            {
                new File9();
            }
            catch(Exception exception) { }
            JOptionPane.showMessageDialog(panel, "已经生成:输入文件in.txt,输出文件out.txt");
        }
        if(obj == iabout)
            JOptionPane.showMessageDialog(panel, "小组作业：七班第5小组完成");
        if(obj == ihelp)
            JOptionPane.showMessageDialog(panel, "小组作业：七班第5小组完成");
        //如果文本框中的最后字符不是运算符，并且当前点击了运算符，将点击的运算符拼接上
        if(getLastChar() != '+' && getLastChar() != '-' && getLastChar() != '*' && getLastChar() != '/' && getLastChar() != '@')
        {
            if(obj == bAdd)
                textAnswer.setText(textAnswer.getText() + "+");
            if(obj == bSub)
                textAnswer.setText(textAnswer.getText() + "-");
            if(obj == bMul)
                textAnswer.setText(textAnswer.getText() + "*");
            if(obj == bDiv)
                textAnswer.setText(textAnswer.getText() + "/");
            if(obj == rKH && able > 0 && getLastChar() != '(')
            {
                textAnswer.setText(textAnswer.getText() + ")");
                able--;
            }
        }
        if(obj == lKH && (getLastChar() == '+' || getLastChar() == '-' || getLastChar() == '*' || getLastChar() == '/' || getLastChar() == '@'))
        {
            textAnswer.setText(textAnswer.getText() + "(");
            able++;
        }
        if(obj == clear)
            textAnswer.setText("");
        if(obj == BackSpace)
        {
            String s = textAnswer.getText();
            textAnswer.setText("");
            for(int j = 0; j < s.length() - 1; j++)
            {
                char c = s.charAt(j);
                textAnswer.setText(textAnswer.getText() + c);
            }

        }
        //点击等号后进行计算
        if(obj == benter && getLastChar() != '@' && able == 0 && getright())
        {
            textAnswer.setText(textAnswer.getText() + "=");
            Arithmetic arithmetic = new Arithmetic(textAnswer.getText());
            textAnswer.setText(arithmetic.end);
        }
    }

    public static void main(String args[])
    {
        new JiSuanQi();
    }

    
}