ca.java

一款计算器软件,除了能完成类WINDOWS的标准型计算器功能外,还有计时功能.

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
public class ca {
	public static void main(String[] s){
        new go() ;
	}
}
class go extends JFrame {
	public JFrame fm;
	public JPanel p,p1,p2,p3,p4,p5;//p是总体嵌套面板，p1为按钮面板嵌套面板，p2,p3,p4,p5的功能见下
	public JTextField   textShow;//显示栏
	public JMenuBar menu;//菜单栏
	public JMenu  editMenu;//编辑
	public JMenu  viewMenu;//查看
	public JMenu  helpMenu;//帮助
	public JTextArea help;//跳出的帮助对话框
	public JScrollPane  helpwindow;//创建一个空的（无视口的视图）JScrollPane，需要时水平和垂直滚动条都可显示
	public JMenuItem  copyItem;//复制
	public JMenuItem  pasteItem;//粘贴
	public JMenuItem  tItem;//标准型
	public JMenuItem  sItem;//科学型
	public JMenuItem  helptopic;//帮助主题
	public JMenuItem  copyright;//关于计算器
	public JButton b1,b2,b3,b4,b5,b6,b7;
	public JButton b[],bn1[];//b[]存放数字键及"+/-",".",bn1存放数字符号键
	public String signal1[]={"9","8","7","6","5","4","3","2","1","0","+/-","."};//利用这两个字符数组实现对按钮命名
	public String signal2[]={"*","/","-","+","sqrt","%","1/x","="};
	public  double  memory=0.0,result=0.0;//memory记录运算中间值,连续运算时用到,result记录结果
	public int clickflag=1;//一旦出现非法操作,clickflag=0,则继续按键无意义
	public int signflag;//数字前的正负号标志
	public int dotflag=0;//小数点是否按下标志
	
	public String copy;
	public int oper=-1,pre=-1;//pre用来记下前一运算符,oper用来记下当前操作符
	public int operflage=0;//运算符标志,再次进行其他运算时，协助清屏
	
	public JLabel lb1 = new JLabel("已使用时间:");//计时器提示
	public JLabel lb2= new JLabel();//计时器显示时间
	public int time=0;
	public Thread t; 
	
	
	public go()
	{
		
		fm=new JFrame("Java计算器");
		textShow=new JTextField(22);//显示框
		textShow.setText("");
		p=new JPanel();
		fm.getContentPane().add(p);
		p.setLayout(new BorderLayout());
		menu=new JMenuBar();//菜单栏:编辑,查看,帮助均添加于此
		editMenu=new JMenu("编辑");
		editMenu.addActionListener(new Handler());
		
		viewMenu=new JMenu("查看");
		viewMenu.addActionListener(new Handler());
		
		helpMenu=new JMenu("帮助");
		helpMenu.addActionListener(new Handler());
		
		copyItem=new JMenuItem("复制 Ctrl+C");
		copyItem.addActionListener(new Handler());
		
		pasteItem= new JMenuItem("粘贴 Ctrl+V");
		pasteItem.addActionListener(new Handler());
		
		editMenu.add(copyItem);
		editMenu.add(pasteItem);
		tItem=new JMenuItem("*标准型(T)");
		sItem=new JMenuItem("科学型(S)");
		sItem.addActionListener(new Handler());
		viewMenu.add(tItem);
		viewMenu.add(sItem);
		helptopic=new JMenuItem("帮助主题");
		helptopic.addActionListener(new Handler());
		copyright=new JMenuItem("关于计算器");
		copyright.addActionListener(new Handler());
		helpMenu.add(helptopic);
		helpMenu.addSeparator();
		helpMenu.add(copyright);
		help=new  JTextArea(5,20);//跳出的帮助窗口
		helpwindow=new JScrollPane(help);
		help.append("执行步骤说明:\n");//追加指定字符,即在帮助窗口中的文字
		help.append("*先输入运算数1:\n");
		help.append("*输入运算符:\n");
		help.append("*再输入运算数2\n");
		help.append("*单击 ' = ' 输出结果\n");
		help.append("注:也可进行连续运算.\n");
		menu.add(editMenu);
		menu.add(viewMenu);
		menu.add(helpMenu);
		p.add(menu,BorderLayout.NORTH);//将菜单栏添加到北面即面板上面
		p.add(textShow,BorderLayout.CENTER);//显示栏添加在中部
		p1=new JPanel();//p1为总按钮面板
		p1.setLayout(new BorderLayout(30,30));
		p.add(p1,BorderLayout.SOUTH);//将p1这个总按钮面板添加至p的南面
		b1=new JButton("Backspace");
		b1.addActionListener(new Handler());
		b2=new JButton("CE");
		b2.addActionListener(new Handler());
		b3=new JButton("C");
		b3.addActionListener(new Handler());
		p2=new JPanel();//p2为放置"Backspace","CE","C"以及计时器的面板,嵌套在p1中,居北
		p2.setLayout(new FlowLayout(FlowLayout.CENTER));
		
	    
		lb1.setForeground(Color.blue);//设置显示计时字符的颜色
		lb2.setForeground(Color.blue);
		p2.add(lb1);
		p2.add(lb2);
		
		lb2.setText("");
		t = new Thread(new Handler());
		t.start();
		
		
		p2.add(b1);
		p2.add(b2);
		p2.add(b3);
		
		p1.add(p2,BorderLayout.NORTH);
		
		
		b=new JButton[12];
		p3=new JPanel();//p3为放置数字键以及"+/-","."的面板,也嵌套在p1中,居中
		p3.setLayout(new GridLayout(4,3));
		for(int i=0;i<12;i++)//为按钮赋名称并设置监听
		{
			b[i]=new JButton(signal1[i]);
			b[i].addActionListener(new Handler());
			p3.add(b[i]);
		}
		
		
		
			
		p1.add(p3,BorderLayout.CENTER);
		p4=new JPanel();//p4为放置"MC","MR","MS","M+"的面板,也嵌套在p1中,居西
		p4.setLayout(new GridLayout(4,1));
		b4=new JButton("MC");
		b4.addActionListener(new Handler());
		p4.add(b4);
		b5=new JButton("MR");
		b5.addActionListener(new Handler());
		p4.add(b5);
		b6=new JButton("MS");
		b6.addActionListener(new Handler());
		p4.add(b6);
		b7=new JButton("M+");
		b7.addActionListener(new Handler());
		p4.add(b7);
		p1.add(p4,BorderLayout.WEST);
		
		p5=new JPanel();//p5为放置运算符的面板,也嵌套在p1中,居东
		p5.setLayout(new GridLayout(4,2));
		bn1=new JButton[8];
		
		for(int i=0;i<8;i++)
		{
			bn1[i]=new JButton(signal2[i]);
			bn1[i].addActionListener(new Handler());
			p5.add(bn1[i]);
		}
		p1.add(p5,BorderLayout.EAST);
		
		fm.setSize(390,265);
		fm.setVisible(true);

	}


class Handler implements ActionListener,Runnable//监听类
{
	
	public void run()
	  {
	  	  while(true)
	  	  {
	  	  	 try{
	  	  	 	  lb2.setText(String.valueOf(time++));
	  	  	 	  Thread.sleep(1000);
	  	  	}catch(Exception e){}
	  	  }
	  }
	
	public void actionPerformed(ActionEvent e){
		try{
		if(e.getSource()==b1)//按下'Backspace'键
		{
			String s=textShow.getText();
			textShow.setText("");
			for(int i=0;i<s.length()-1;i++)
			{
				char a=s.charAt(i);
				textShow.setText(textShow.getText()+a);
			}
			
		}
		if(e.getSource()==b2)//按下'CE'键
		{
			textShow.setText("");
			clickflag=1;
			operflage=0;
		}
		if(e.getSource()==b3)//按下'C'键
		{
			memory=0;
			result=0;
			textShow.setText("");
			clickflag=1;
			operflage=0;
		}
		if(e.getSource()==copyItem)//复制
		{
			copy=textShow.getText();
		}
		if(e.getSource()==pasteItem)//粘贴
		{
			textShow.setText(textShow.getText()+copy);
		}
		if(e.getSource()==sItem)//科学型
		{
			JOptionPane.showMessageDialog (fm, "对不起,此项功能更新中...");
		}
		if(e.getSource()==helptopic)//帮助主题
		{
			JOptionPane.showMessageDialog(p,helpwindow);
		}
		if(e.getSource()==copyright)//关于计算器
		{
			JOptionPane.showMessageDialog(p,"开发者:刘倩(计应0504）");
		}
		for(int i=0;i<=9;i++)
		{
			if(e.getSource()==b[i]&&clickflag==1)//按下数字键
			{
				if(operflage==0)
					textShow.setText(textShow.getText()+Integer.toString(9-i));
				else{
					textShow.setText("");
					textShow.setText(textShow.getText()+Integer.toString(9-i));
					operflage=0;
					}
				
			}
		}
		if(e.getSource()==b[10]&&clickflag==1)//按下'-/+'键
		{
			signflag=1;
			String s=textShow.getText();
			if(signflag==1)
			{
				if(s.charAt(0)=='-')
				{
					textShow.setText("");
					for(int i=1;i<s.length();i++)
					{
						char a=s.charAt(i);
						textShow.setText(textShow.getText()+a);
					}
				}
				else
					textShow.setText('-'+s);
			
			}
		}
		
			
		if(e.getSource()==b[11]&&clickflag==1)//按下小数点
		{
			
			if(textShow.getText().length()==0)
				dotflag=1;
			for (int i = 0; i < textShow.getText().length(); i++)
				if ('.' == textShow.getText().charAt(i)) {//检查屏幕字符中是否已有小数点
					dotflag= 1;
				    break;
				}
				if (dotflag == 0)
					textShow.setText(textShow.getText() + ".");
				}
		
		if(e.getSource()==bn1[4]&&clickflag==1)//开方运算
		{
			operflage=1;
			String s=textShow.getText();
			if(s.charAt(0)=='-')
			{
				JOptionPane.showMessageDialog (fm, "负数不能开根号...");
				clickflag=0;
			}
			else
				textShow.setText(Double.toString(java.lang.Math.sqrt(Double.parseDouble(textShow.getText()))));
		}
		if(e.getSource()==bn1[6]&&clickflag==1)//倒数运算
		{
			operflage=1;
			String s=textShow.getText();
			if(s.charAt(0)=='0'&&textShow.getText().length() == 1)
			{
				JOptionPane.showMessageDialog (fm, "0不能求倒数...");
				clickflag=0;
			}
			else

			{
				 s = Double.toString(1 / Double.parseDouble(textShow.getText()));
				 textShow.setText(s);

			}
		}
		if(e.getSource()==bn1[5]&&clickflag==1){//两数相除后，按此键，进行取余操作
			operflage=1;
			String s=textShow.getText();
			if(s.charAt(0)=='0')
				textShow.setText("0");
			else
			{
				 memory = Double.parseDouble(textShow.getText());
				 pre = -1;
				 result %= Double.parseDouble(textShow.getText());
				 textShow.setText(Double.toString(result));
			}
			
		  }

		
		if ( (e.getSource() == bn1[3] || e.getSource() == bn1[2] || e.getSource() == bn1[0] ||
				e.getSource() == bn1[1]) && clickflag==1) //加减乘除的运算
		{
			if (e.getSource() == bn1[3]) {//加操作
				switch (pre) {
			    case 0:
			    result += Double.parseDouble(textShow.getText());
			    break;
			    case 1:
			    result -= Double.parseDouble(textShow.getText());
			    break;
			    case 2:
			    result *= Double.parseDouble(textShow.getText());
			    break;
			    case 3:
			    if (Double.parseDouble(textShow.getText()) == 0) {
			    	textShow.setText("除数不能为零");
				    clickflag = 0;
				    }
			    else
			    	result /= Double.parseDouble(textShow.getText());
			    break;
			    default:
			    	result = Double.parseDouble(textShow.getText());
			    }
				textShow.setText("");
				pre =0; 
				oper = 0;
				}
			if (e.getSource() == bn1[2]) {//减操作
				switch (pre) {
				case 0:
				result += Double.parseDouble(textShow.getText());
				break;
				case 1:
				result -= Double.parseDouble(textShow.getText());
				break;
				case 2:
				result *= Double.parseDouble(textShow.getText());
				break;
				case 3:
				if (Double.parseDouble(textShow.getText()) == 0) {
				textShow.setText("除数不能为零");
				clickflag= 0;
				}
				else
				result /= Double.parseDouble(textShow.getText());
				break;
				default:
				result = Double.parseDouble(textShow.getText());
				}
				textShow.setText("");
				pre = 1;
				oper = 1;
					
				}

				if (e.getSource() == bn1[0]) {//乘操作
				switch (pre) {
				case 0:
				result += Double.parseDouble(textShow.getText());
				break;
				case 1:
				result -= Double.parseDouble(textShow.getText());
				break;
				case 2:
				result *= Double.parseDouble(textShow.getText());
				break;
				case 3:
				if (Double.parseDouble(textShow.getText()) == 0) {
				textShow.setText("除数不能为零");
				clickflag= 0;
				}
				else
				result /= Double.parseDouble(textShow.getText());
				break;
				default:
				result = Double.parseDouble(textShow.getText());
				}
				textShow.setText("");
				pre = 2;
					oper = 2;
					
				}

				if (e.getSource() == bn1[1]) {//除操作
				switch (pre) {
				case 0:
				result += Double.parseDouble(textShow.getText());
				break;
				case 1:
				result -= Double.parseDouble(textShow.getText());
				break;
				case 2:
				result *= Double.parseDouble(textShow.getText());
				break;
				case 3:
				if (Double.parseDouble(textShow.getText()) == 0) {
				textShow.setText("除数不能为零");
				clickflag= 0;
				}
				else
				result /= Double.parseDouble(textShow.getText());
				break;
				default:
				result = Double.parseDouble(textShow.getText());
				}
				textShow.setText("");
				pre = 3;
					oper= 3;
				}
				
				}

				if (e.getSource() == bn1[7] && clickflag==1) {//按下“=”
					operflage=1;//按下等号的记录标识符，有助于清屏
					if (pre == 1000) {//连按等号情况
						if (oper == 0) {
							result += memory;
							textShow.setText(Double.toString(result));
							}
						if (oper == 1) {
							result -= memory;
							textShow.setText(Double.toString(result));
							}
						if (oper == 2) {
							result *= memory;
							textShow.setText(Double.toString(result));
							}
						if (oper == 3) {
							if (Double.parseDouble(textShow.getText()) == 0) {
								textShow.setText("除数不能为零");
								clickflag= 0;
								}
							else {
								result /= memory;
								textShow.setText(Double.toString(result));
								}
							}
						}
					else {
						memory = Double.parseDouble(textShow.getText());
						if (oper == 0) {
							pre = -1;
							result += Double.parseDouble(textShow.getText());
							textShow.setText(Double.toString(result));
							}
						if (oper == 1) {
							pre = -1;
							result -= Double.parseDouble(textShow.getText());
							textShow.setText(Double.toString(result));
							}
						if (oper == 2) {
							pre = -1;
							result *= Double.parseDouble(textShow.getText());
							textShow.setText(Double.toString(result));
							}
						if (oper == 3) {
							pre = -1;
							if (Double.parseDouble(textShow.getText()) == 0) {
								textShow.setText("除数不能为零");
								clickflag= 0;
								}
							else {
								result /= Double.parseDouble(textShow.getText());
								textShow.setText(Double.toString(result));
								}
							}
						}
					pre =1000;
					}
				
				if ( (e.getSource() == b4 || e.getSource() == b5 || e.getSource() == b6 ||
						e.getSource() == b7) && clickflag==1) {
					JOptionPane.showMessageDialog (fm, "对不起,此项功能更新中...");
					}
				}
		catch(Exception e1){
			JOptionPane.showMessageDialog (fm, "操作非法!");
			clickflag=0;
			}
		}
	}
}